J. M.
Reputation
56,865
147/100 score
 Apr 24 comment Why PolarPlot can have negative $r$? I'm not comfortable with "over defining"; negative $r$ can be interpreted geometrically just as well as positive $r$. Just go in the direction opposite to that for positive $r$. Apr 24 comment Writing a word with straight lines @Vivid, you can do experiments yourself, just change the appropriate places in Style["MUSEUM", FontFamily -> "Arial"]. Apr 24 revised How convert old version 2.2 .ma files to .nb notebooks? edited tags Apr 24 comment Why PolarPlot can have negative $r$? Congratulations, you've discovered that polar representations for points are not unique. :) That point often comes up when finding intersections of polar curves; see any nice analytic geometry text for details. And of course $(1,-\pi/4)$ is also an admissible representation for the point you speak of. (FWIW, I only learned polar coordinates years after I was no longer in school. But Scouting experience already taught me the concept of distance and bearing.) Apr 24 comment How convert old version 2.2 .ma files to .nb notebooks? @ciao, heh, my netbook is where I do most of my artwork, as seen on my Gravatars. Takes quite a while, of course, but it works. I'm used to pinching shoes; a long while ago I was trying to implement numerical algorithms on an old Texas Instruments programmable calculator as an exercise. ;) Apr 24 comment Unexpected behavior of BSplineFunction and BezierFunction You say BSplineFunction[] in the title, but BezierFunction[] in the body. Which one do you actually want? Apr 24 revised Unexpected behavior of BSplineFunction and BezierFunction edited tags Apr 24 comment Why PolarPlot can have negative $r$? Well, you know the conversion from polar to Cartesian, no? Plug those values in and see for yourself. Apr 24 revised continuous evolution edited tags Apr 24 comment Can anyone give torrent link for Mathematica in Ubuntu? Wolfram doesn't really use torrents for official Mathematica releases. Contact their support if you are having any trouble downloading from their site. Apr 24 comment Why PolarPlot can have negative $r$? Prolly you meant that when $\theta=3\pi/4$ or $\theta=-\pi/4$, you have a radius of $-1/2$. Apr 24 revised Are there any code which just derivative of piecewise function(same distence)? edited tags Apr 24 revised What do the lines in a ContourPlot Mean? added 1 character in body; edited title Apr 24 revised Why PolarPlot can have negative $r$? edited tags Apr 24 comment Why PolarPlot can have negative $r$? "which is against the mathematical definition" - well, that depends on your convention; for me, negative $r$ makes sense for curves like the lemniscate of Bernoulli or the spiral of Archimedes. Apr 23 comment Core functions or operations that every aspiring Mathematica programmer should know? @Karsten, now if only there were animations for the newer functions as well… Apr 23 comment Writing a word with straight lines "maybe prioritising those with angle close to ±90 degrees" - the route that requires least programming effort would be something like rejection sampling; that is, the segment picking can be biased towards vertical lines, and only allow less steep lines, say, 10 % of the time. Apr 23 revised Finding all maxima and minima of a function deleted 3 characters in body Apr 23 answered What do the lines in a ContourPlot Mean? Apr 23 revised Correcting problems with the controls in a Manipulate edited tags