http://math.exeter.edu/rparris Latest version of PEAnut Software en-us 04 Nov 2009 15:32:00 GMT 04 Nov 2009 15:32:00 GMT Weblog Editor 2.0 rparris@exeter.edu (Rick Parris) rparris@exeter.edu (Rick Parris) http://math.exeter.edu/rparris/winplot.html At the request of a user, it is now possible to intersect parametric surfaces with other types of surfaces in 3D. This was a complicated addition, so I await news of unintended consequences. wpupdate 04112009 04 Nov 2009 15:32:00 GMT http://math.exeter.edu/rparris/winstats.html Made some modifications to the theoretical Probability windows. With the help of a power user, I found errors (and crashes) that resulted from extreme parameter values in "Binomial" and "Hypergeometric" windows, and rewrote the code that calculates the "Count Values" distribution. You will notice that it was necessary to sacrifice speed to achieve accuracy. wsupdate 29102009 29 Oct 2009 17:30:17 GMT http://math.exeter.edu/rparris/winwordy.html A new word list has been added --- Caesar pairs. wwupdate 27102009 27 Oct 2009 11:11:11 GMT http://math.exeter.edu/rparris/winstats.html A user reported a crash when requesting a probability for a Prob|Normal window in full-screen mode. Another user reported Simulation|Roll Dice trouble when changing parameters while the See Stats window was open. Both bugs have been fixed. wsupdate 21102009 21 Oct 2009 12:00:00 GMT http://math.exeter.edu/rparris/winplot.html At the request of a user, it is now possible to make individual surfaces in 3D windows transparent. Details are in the Equa|Help text. wpupdate 16102009 16 Oct 2009 11:11:11 GMT http://math.exeter.edu/rparris/winplot.html A user reported that supplementary text in 3D windows was not holding its position when the window contents were restored with Ctrl+F. That has been fixed. wpupdate 14102009 14 Oct 2009 11:11:11 GMT http://math.exeter.edu/rparris/wingeom.html To my horror, I discovered that the 3D label-positioning function was accidentally disabled a couple of months ago. It now works again. wgupdate 11102009 11 Oct 2009 19:10:00 GMT http://math.exeter.edu/rparris/winplot.html A user reported that 2D points that should be invisible (because they are outside the view frame) were appearing (as half-circles) at the edge of the frame. They are now invisible. wpupdate 07102009 08 Oct 2009 17:15:00 GMT http://math.exeter.edu/rparris/wingeom.html Fixed a hidden-line glitch that was impairing the Zoom (magnify) feature in 3D. wgupdate 02102009 02 Oct 2009 22:30:00 GMT http://math.exeter.edu/rparris/wingeom.html A user reported that the 3D menu item Point|Point on Circle was sometimes grayed out when it should not have been. The problem has been solved. wgupdate 29092009 29 Sep 2009 20:30:00 GMT http://math.exeter.edu/rparris/wingeom.html Added three new examples to the demonstration files. wgupdate 23092009 23 Sep 2009 16:50:00 GMT http://math.exeter.edu/rparris/winplot.html Thanks to a user request, I realized that turning off the arrows at the end of the 3D coordinate axes was also turning off all the other arrows that might appear in the diagram. These other arrows have now achieved their independence. wpupdate 19092009 19 Sep 2009 13:50:00 GMT http://math.exeter.edu/rparris/winplot.html Evaluated text should display "?" when a value cannot be calculated for the proposed expression; a user pointed out that this was not happening all the time. Should be ok now. wpupdate 17092009 17 Sep 2009 23:40:50 GMT http://math.exeter.edu/rparris/winfeed.html Fixed a couple of anomalies in the new PostScript-SVG-PiCTeX export routines. wfupdate 17092009 17 Sep 2009 23:40:50 GMT http://math.exeter.edu/rparris/wingeom.html More corrections --- a user reported that the Trace feature was not connecting the dots properly (an unintended consequence of a new, uniform approach to graphical output). wgupdate 13092009 13 Sep 2009 23:59:59 GMT http://math.exeter.edu/rparris/winplot.html Any window can now export its contents as an encapsulated PostScript file or as an SVG file. wpupdate 12092009 12 Sep 2009 14:10:00 GMT http://math.exeter.edu/rparris/wingeom.html As a follow-up to the changes on 31 Aug, made numerous small corrections to the various graphics output procedures. wgupdate 09092009 9 Sep 2009 16:34:56 GMT http://math.exeter.edu/rparris/winfeed.html I fixed a nasty bug, which had been causing sporadic crashes when new windows were opened. I give thanks to the users who brought this to my attention. Something new: several of the windows can now export Postscript graphics. wfupdate 03092009 3 Sep 2009 10:45:00 GMT http://math.exeter.edu/rparris/wingeom.html At the request of a user, it is now possible to export PostScript graphics from most of the windows. This involved extensive writing, and I await news of unintended consequences. wgupdate 31092009 31 Aug 2009 12:34:56 GMT http://math.exeter.edu/rparris/winstats.html At the request of a user, it is now possible to export PostScript graphics from many of the windows. This involved extensive writing, and I await news of unintended consequences. wsupdate 31092009 31 Aug 2009 12:34:56 GMT http://math.exeter.edu/rparris/windisc.html The contents of the Graph window can now be exported as a PostScript file. This involved extensive writing, and I await news of unintended consequences. wdupdate 31092009 31 Aug 2009 12:34:56 GMT http://math.exeter.edu/rparris/winarc.html The contents of several windows can now be exported as a PostScript file. This involved extensive writing, and I await news of unintended consequences. waupdate 31092009 31 Aug 2009 12:34:56 GMT http://math.exeter.edu/rparris/winstats.html Posted the Portuguese version today. wsupdate 24082009 24 Aug 2009 16:20:00 GMT http://math.exeter.edu/rparris/wincalc.html It is now possible to record the calculation history of a specific variable (during a recursion, for example). There is also a new dialog box for converting numbers from one scale to another (decimal to hexadecimal, for example). Anatoly Koryanov, who has already translated several other Peanut programs, helped me develop a Russian version. wcupdate 23082009 23 Aug 2009 15:30:00 GMT http://math.exeter.edu/rparris/winwordy.html A disappointed user pointed out that the wordfind window did not remember search results (or save them with the rest of a file). The program has now been instructed to do that. wwupdate 22092009 22 Aug 2009 16:30:00 GMT http://math.exeter.edu/rparris/wincalc.html Fixed several errors that have emerged since the update nine days ago. wcupdate 19082009 19 Aug 2009 23:59:59 GMT http://math.exeter.edu/rparris/wincalc.html A variety of small-integer lists are now available. Among them are primes, factors, Pythagorean triples, Pythagorean quadruples, Heronian triangles, and so on. wcupdate 10082009 10 Aug 2009 12:34:56 GMT http://math.exeter.edu/rparris/wingeom.html It is now possible to remove extra steps from the 3D construction history. For example, assigning a color to a face makes previous assignments obsolete, but they are still part of the history. I also forgot to update the version number in macro windows a couple of weeks ago, and that has been fixed. wgupdate 07082009 07 Aug 2009 13:34:00 GMT http://math.exeter.edu/rparris/winplot.html A power user reported that Linked windows were not opening old files. Now they are (I forgot to tell them what version of the program they belong to). wpupdate 05082009 05 Aug 2009 23:45:00 GMT http://math.exeter.edu/rparris/wingeom.html Some refining of yesterday's update were necessary, and there are new developments. I now realize from user feedback that it is possible to write polygon descriptions that "close" the figure by repeating the first vertex label at the end of the name, as in the pentagon description "ABCDEA". Although it is perfectly clear what the intent is, the program was not taught to detect and remove the extra letter; in fact, it has been viewing "ABCDEA" as a description for a hexagon. The program has now been modified to make it aware. The challenge (as always) is to teach the program to deal silently with existing files that have already been compromised. In most cases, extra labels have no effect, but complications are possible, and they have been appearing in 3D. The behavior of the color-selection window in the 3D face-edit dialog has also been improved. wgupdate 26072009 26 Jul 2009 11:11:11 GMT http://math.exeter.edu/rparris/wingeom.html Repaired a couple of serious errors, which were discovered when a power user reported difficulty opening some old files. While enhancing 3D reflections in January, I inadvertently changed the code so that reflections in older files could no longer be read correctly; this has been fixed. It was also necessary to repair some ancient code for the label parser, which was occasionally handling primes and subscripts badly. The program now displays a version number, and the Properties|Version tab (which appears when you right-click the program icon) actually displays information (which is of no great significance, but it makes the program look better). wgupdate 24072009 24 Jul 2009 16:20:00 GMT http://math.exeter.edu/rparris/winfeed.html Uploaded the Russian version today. Also fixed numerous small errors, such the bizarre numerical display in the title of the Julia Promenade window, and some residual English in the Korean version. The Edit menus of IFS windows now make animation constants available (as the help text was implying). In Julia windows, each IIM drawing now terminates automatically, unless the user clicks the item View|Draw. Whenever the user interrupts the IIM by pressing Q, a new ceiling is established for the counter. wfupdate 23072009 23 Jul 2009 12:30:00 GMT http://math.exeter.edu/rparris/winplot.html Not yet perfect --- in the version put on line two days ago, the global erasing of drawings was left unenabled. Should be ok now. wpupdate 18072009 18 Jul 2009 17:00:00 GMT http://math.exeter.edu/rparris/winstats.html Double-clicking the icon for a matrix data file (*.fma) should prompt the program to open the file in the correct window (one-variable versus multi-variable). At long last, the program seems to be making this decision reliably. wsupdate 17072009 17 Jul 2009 15:30:00 GMT http://math.exeter.edu/rparris/winplot.html Four developments to report, all prompted by user feedback. At the request of a classroom teacher, the free-drawing option that appears in the mapping windows has been improved, and inserted into the main 2D window. It was also reported that "undoing" a 2D transformation was causing sporadic crashes. That bug has been exterminated. The user-defined function dialog box now accepts requests for functions of three variables. The program now displays a version number, and the Properties|Version tab (which appears when you right-click the program icon) now displays information (which is mostly of no significance, but it makes the program look better). wpupdate 16072009 16 Jul 2009 17:30:00 GMT http://math.exeter.edu/rparris/wingeom.html A user reported that attaching imported clipboard graphics to points was not working. The bug has been fixed. wgupdate 07072009 7 Jul 2009 14:30:00 GMT http://math.exeter.edu/rparris/winplot.html A user reported that attaching imported clipboard graphics to points was not working. The bug has been fixed. wpupdate 07072009 7 Jul 2009 14:30:00 GMT http://math.exeter.edu/rparris/winstats.html A user suggested that the graphical display of confidence intervals (already found in the normal interval for the mean) be extended to all the dialog boxes that calculate confidence intervals. It has been done. wsupdate 06072009 6 Jul 2009 15:50:00 GMT http://math.exeter.edu/rparris/wincalc.html Calculated and uploaded the 47rd Mersenne prime, to keep my library of examples up to date. wcupdate 30062009 30 Jun 2009 12:00:00 GMT http://math.exeter.edu/rparris/winplot.html Responding to a suggestion, I modified the "table" feature in 2D, so that it displays the coordinates of an active web diagram when one is on the screen. A new source of useful examples has been contributed by a power user. wpupdate 29062009 29 Jun 2009 13:30:00 GMT http://math.exeter.edu/rparris/winplot.html Fixed a bit of sloppy code that may have been causing sporadic crashes after items were deleted from the Inventory. wpupdate 26062009 26 Jun 2009 18:30:00 GMT http://math.exeter.edu/rparris/winarc.html Posted the Russian version, and corrected a few errors in the Life and Rubik windows. waupdate 21062008 21 Jun 2009 21:00:00 GMT http://math.exeter.edu/rparris/winplot.html During a recent update, I inadvertently disabled the attach-text-to-a-point feature. It has been enabled again. Thanks to a power user for reporting this. wpupdate 20062009 20 Jun 2009 15:45:00 GMT http://math.exeter.edu/rparris/winfeed.html Uploaded the Korean version today. wfupdate 15062009 15 Jun 2009 23:59:00 GMT http://math.exeter.edu/rparris/winplot.html The first unintended consequence has appeared (3D files that include implicit surfaces would not open without crashing), and it has been repaired. (There is nothing wrong with the files.) wpupdate 06062009 6 Jun 2009 04:00:00 GMT http://math.exeter.edu/rparris/winstats.html Fixed some inevitable errors that resulted from the recent dialog-box transcription feature. wsupdate 01062009 1 Jun 2009 17:00:00 GMT http://math.exeter.edu/rparris/winstats.html Thanks to a request from a power user, the program now automatically writes results from continuous-probability calculation dialog boxes into a text document. wsupdate 30052009 30 May 2009 17:00:00 GMT http://math.exeter.edu/rparris/windisc.html I discovered that the bitmap-to-clipboard feature had become disbled in graph windows. It is ok now. wdupdate 27052009 27 May 2009 17:00:00 GMT http://math.exeter.edu/rparris/winplot.html At the request of two users, the graphing of vector fields in 3D is now enabled. Lots and lots of vectors. wpupdate 25052009 25 May 2009 14:30 GMT http://math.exeter.edu/rparris/winstats.html Posted the Russian version today. wsupdate 24052009 24 May 2009 18:00:00 GMT http://math.exeter.edu/rparris/wingeom.html A Spanish version is now available, thanks to Alejandro Segade. wgupdate 15052009 15 May 2009 23:00:00 GMT http://math.exeter.edu/rparris/wingeom.html The Soddy construction has been extended to tangent spheres in 3D. wgupdate 18042009 18 Apr 2009 23:55:00 GMT http://math.exeter.edu/rparris/winplot.html Fixed a minor glitch --- after simulprinting multiple images on a single sheet of paper, the program was hiding the graphing window, forcing the user to re-open the original file. wpupdate 16042009 16 Apr 2009 23:55:00 GMT http://math.exeter.edu/rparris/winstats.html A user suggested that the "Animate" menu item in a few of theSimulation windows be made to do what its name suggests; for example, you can now watch simulated needles falling onto a grid, one at a time, until one of them contacts a line. wsupdate 29032009 29 Mar 2009 23:56:00 GMT http://math.exeter.edu/rparris/wingeom.html A power user reported a crash when trying to animate a rotation using the new axis "ZZ". This otherwise unnoticeable bug has been exterminated. wgupdate 29032009 29 Mar 2009 23:56:00 GMT http://math.exeter.edu/rparris/winstats.html At some time earlier this month, I inadvertently disabled the Many-trial option in some of the simulation windows; it is active again. wsupdate 27032009 27 Mar 2009 23:56:00 GMT http://math.exeter.edu/rparris/wingeom.html The 3D rotation dialog now understands "XX", "YY", and "ZZ" as code for the coordinate axes. wgupdate 27032009 27 Mar 2009 17:30:00 GMT http://math.exeter.edu/rparris/winplot.html Added a new function constructor --- ifpos(f|v,g) returns f if v is positive, and returns g otherwise. Also fixed a few minor glitches. wpupdate 24032009 24 Mar 2009 15:30:00 GMT http://math.exeter.edu/rparris/winplot.html At the request of a user, I added inflection points to the list of Extremes in 2D windows (these are points where y' is extreme). wpupdate 18032009 18 Mar 2009 17:25:00 GMT http://math.exeter.edu/rparris/wingeom.html For most users, this is not an issue, but I just noticed that I forgot to tell the PiCTeX file writer about the new label switch (3 Mar). Now it knows. wgupdate 17032009 17 Mar 2009 14:12:00 GMT http://math.exeter.edu/rparris/faq.html Question 4 is new today. faqupdate 13032009 13 Mar 2009 16:15:00 GMT http://math.exeter.edu/rparris/winplot.html Attended to an assortment of glitches. A user reported trouble when retrieving diagrams with inserted text items, and I discovered that the "evaluated text" feature (introduced in June of 2006) was producing some unintended consequences for ordinary text. During the investigation, I also discovered that 3D file retrieval was not always centering the original diagram, and that the program was occasionally miscalculating the "box" that encloses a 3D curve. Finally, the 3D Btns Help now has an explanation of what it really means to position text "with respect to the figure." Sorry for any inconveniences. wpupdate 11032009 11 Mar 2009 20:00:00 GMT http://math.exeter.edu/rparris/wingeom.html It is now possible to import one 2D (Euclidean) drawing into another, using the new Edit|Import menu. This consists of Attaching an external file (figure) to the current drawing, by matching two directed segments (which can be selected with the mouse). I also fixed a couple of bugs (but probably introduced a couple of new ones). wgupdate 09032009 09 Mar 2009 21:00:00 GMT http://math.exeter.edu/rparris/winstats.html A user reported a crash when closing the program, so I found and eradicated a bug. wsupdate 05032009 05 Mar 2009 17:00:00 GMT http://math.exeter.edu/rparris/winstats.html In the Calculation menu for the Student t window, the two Paired Observations dialog boxes now allow the user to choose between one-matrix and two-matrix data input. wsupdate 04032009 04 Mar 2009 21:00:00 GMT http://math.exeter.edu/rparris/wingeom.html Two significant changes to report. First, it is now possible to import one 3D drawing into another, using the new Edit|Import menu. This consists of Attaching an external file (figure) to the current drawing, by matching designated triangles (which can be selected with the mouse). I hope to have the 2D version of this feature working soon. Second, there are now three modes for displaying vertex labels (in all windows), and pressing Ctrl+C cycles through them. The default mode is to display labels according to their individual on/off specifications (as set in the 2D Edit|Label|Individual dialog box, for example). The second mode is to display all labels, regardless. The third mode is to display no labels. Similar remarks apply to pressing Ctrl+D to adjust the display of vertex icons (bullets and circles). The point is that everything can now be turned off, if that is what you want. I do not know why it took me so long to figure this out. wgupdate 03032009 03 Mar 2009 16:00:00 GMT http://math.exeter.edu/rparris/wingeom.html A user reported that the Translation transformation in hyperbolic windows was not working correctly. I also noticed, while attending to this error, that the window was also rejecting requests to label the intersection of two lines. These bugs resulted from past improvements, of course. I hope that they have been fixed. By the way, there will be couple of interesting wingeom developments coming in the next couple of days, I hope. wgupdate 27022009 27 Feb 2009 23:59:00 GMT http://math.exeter.edu/rparris/winplot.html It turns out that I did not get the last change quite right! A user reported some misbehaving buttons in the Inventory. I think that the problem has been fixed; sorry for the inconvenience. wpupdate 17022009 17 Feb 2009 23:59:00 GMT http://math.exeter.edu/rparris/wingeom.html Made a slight improvement to the 3D program. When applying a macro that creates colored polygonal faces, the user can decide whether the macro controls the color or whether the host window does. To accomplish the latter (assuming that the desired color has been selected in the host window by clicking Other|Colors|Next Face), just uncheck the host menu item Transformation|Copy Attributes before applying the macro. wgupdate 16022009 16 Feb 2009 23:59:00 GMT http://math.exeter.edu/rparris/winplot.html A user requested that the shading of implicitly defined regions in 2D allow the viewing of individual regions. That dialog box has been revised accordingly. A different user reported that the 2D Translate feature was giving inaccurate results when applied to joined functions. I think that the problem has been fixed. wpupdate 15022009 15 Feb 2009 14:30:00 GMT http://math.exeter.edu/rparris/wingeom.html A user reported a 3D crash that occurs when you try to slide points when there are only two on the screen. A repair has been made. wgupdate 13022009 13 Feb 2009 18:00:00 GMT http://math.exeter.edu/rparris/winplot.html Finished the job that I announced was finished on 26 Jan. wpupdate 02022009 02 Feb 2009 23:30:00 GMT http://math.exeter.edu/rparris/wingeom.html In 3D, the slicing feature was performing erratically when the slice plane met both a surface and a polyhedron. I think that the bug has been repaired. wgupdate 02022009 02 Feb 2009 18:30:00 GMT http://math.exeter.edu/rparris/winplot.html At the request of a user, the display of individual component functions of recursively defined sequences has been enabled, using the miscellaneous Other|DEq windows. I also fixed a couple of minor bugs in the table windows. wpupdate 26012009 26 Jan 2009 23:30:00 GMT http://math.exeter.edu/rparris/wingeom.html Added two new 3D demonstration files. wgupdate 25012009 25 Jan 2009 18:00:00 GMT http://math.exeter.edu/rparris/winstats.html At the request of a power user, a few of the test dialogs now allow you to enter degrees of freedom (for the Student, chi-squared, and F distributions). I also revised the help text so that it better explains how stemplots work in 1-var windows. wsupdate 19012009 19 Jan 2009 12:30:00 GMT http://math.exeter.edu/rparris/wingeom.html 3D reflection planes can now be defined using equations. wgupdate 17012009 17 Jan 2009 13:00:00 GMT http://math.exeter.edu/rparris/winplot.html A power user made several suggestions to enhance the performance of the Mapping windows. wpupdate 14012009 14 Jan 2009 17:00:00 GMT http://math.exeter.edu/rparris/winmat.html A Russian version is now on line. wmupdate 11012009 11 Jan 2009 19:00:00 GMT http://math.exeter.edu/rparris/wingeom.html A couple of users reported a memory leak, which I inadvertently created when installing the new 3D slow-motion feature a few days ago. It affected 2D and 3D animations of all sorts. I think that the leak has been plugged. wgupdate 10012009 10 Jan 2009 19:00:00 GMT http://math.exeter.edu/rparris/wingeom.html A user reported that the 3D program was not remembering color assignments correctly when retrieving old files. This has been fixed. Another user requested that the Replay in Slow Motion feature from 2D be activated in 3D. That has also been done. wgupdate 06012009 06 Jan 2009 15:30:00 GMT http://math.exeter.edu/rparris/wingeom.html The dihedral-angle syntax has been expanded to cover requests for vector-vector angles and vector-plane angles. A couple of glitches in 3D dotted-line displays were corrected. wgupdate 04012009 04 Jan 2009 14:30:00 GMT http://math.exeter.edu/rparris/wingeom.html When applying macros, the target vertices can now be selected with the mouse. See the Edit|Macro help text. wgupdate 01012009 01 Jan 2009 23:30:00 GMT http://math.exeter.edu/rparris/windisc.html The contents of a graphing window can now be saved in SVG format. This is a file that can be displayed by any SVG-enabled browser. wdupdate 29122008 29 Dec 2008 22:00:00 GMT http://math.exeter.edu/rparris/winstats.html Most of the windows can now be saved in SVG format. This is a file that can be displayed by any SVG-enabled browser. wsupdate 28122008 28 Dec 2008 23:30:00 GMT http://math.exeter.edu/rparris/winarc.html Several windows now have an "SVG file" entry. This creates a file that can be displayed by any SVG-enabled browser. waupdate 25122008 25 Dec 2008 15:30:00 GMT http://math.exeter.edu/rparris/wingeom.html The coloring feature announced on 8 Dec has now been extended to all conic sections, where "filling" a conic section means coloring the region in which the focal points lie. This was a bit complicated; I await news of anomalies. wgupdate 23122008 23 Dec 2008 23:00:00 GMT http://math.exeter.edu/rparris/winstats.html The chi-square window now calculates confidence intervals for variance. wsupdate 21122008 21 Dec 2008 23:30:00 GMT http://math.exeter.edu/rparris/winfeed.html Added a new example to the string-rewriting Library. wfupdate 21122008 21 Dec 2008 20:00:00 GMT http://math.exeter.edu/rparris/winplot.html Fixed a harmless (but annoying) bug that afflicted hidden-line removal for some 3D files that were retrieved in slow-draw mode. The files themselves are ok. wpupdate 19122008 19 Dec 2008 23:30:00 GMT http://math.exeter.edu/rparris/winstats.html With the help of a power user, I tightened the connection between the data matrices and test dialogs in normal and Student windows (when a matrix window is open, changes to sample data can only be made via the matrix window); a variety of errors and inconsistencies were also addressed. The user can also now change the width of the pen used to display critical values for these test dialog boxes. In multi-Var windows, the File menu item "Univariate" now opens a 1-Var version of the window, making statistical summaries of individual columns available. wsupdate 19122008 19 Dec 2008 14:00:00 GMT http://math.exeter.edu/rparris/wingeom.html The 3D Transformation menu has a new item --- projection onto a plane. While installing this, I noticed that the application of macros (in 3D) was incomplete (some transformations were not covered), and errors were creeping into surface inventories; that should be better now. I also added a new 2D function to calculate the area of a circular segment (the part of a circle interior that lies to one side of a chord); the name of the function is [seg]. While installing this, I noticed to my horror that some of the code for measurements in Hyperbolic windows was incomplete (producing incorrect results in some situations); repairs have been made. wgupdate 17122008 17 Dec 2008 17:30:00 GMT http://math.exeter.edu/rparris/winstats.html At the request of a user, added a random-walk window to the Simulations menu. Also repaired another error in the critical-value display for t-tests. wsupdate 9122008 09 Dec 2008 17:30:00 GMT http://math.exeter.edu/rparris/wingeom.html In 3D, slicing a cylinder produces an elliptical section. It is now possible to fill these sections with color (meaning that the "fill color" button is enabled in the Edit surfaces dialog box). At the request of a couple of users, it is now possible to format the data window by inserting tabs; this enables Excel (and other programs) to detect the columns when the text is pasted into a spreadsheet. wgupdate 8122008 08 Dec 2008 20:00:00 GMT http://math.exeter.edu/rparris/winstats.html A user reported that the critical-value display for t-tests of significance was behaving strangely. I figured out why, and now it seems ok. wsupdate 4122008 04 Dec 2008 23:59:00 GMT http://math.exeter.edu/rparris/winplot.html At the request of a couple of users, it is now possible to format the Table window by inserting tabs; this enables Excel (and other programs) to detect the columns when the text is pasted into a spreadsheet. For teaching purposes, volumes of revolution can be replaced by systems of cylinders; see the help text for the 2D|One menu for details. wpupdate 2122008 02 Dec 2008 15:00:00 GMT