For questions specific to Version 7 of Mathematica.

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12
votes
6answers
494 views

Sort+Union on a list

Probably this is too trivial question for this forum but for some reason I am not getting it on my Mathematica 7 so far. I have a list ...
7
votes
3answers
365 views

Plotting a 3D list causes kernel to crash if x and y axes have vastly different scales

I have access to two versions of Mathematica, version 7.0.1 on Linux and version 8 on Windows. When I try the following two lines on version 7, the kernel quits when it tries to plot. In version 8 ...
7
votes
2answers
721 views

Legends in combined Plot and ListPlot

I have a set of data ...
7
votes
4answers
282 views

Unexpected behavior from GatherBy in version 7

I have come across what appears to be a bug in GatherBy. It appears similar to the problem of using Table[Random[], {1000}] in ...
12
votes
2answers
318 views

Internal “Periodical” functions in version 7

In version 7 there exist these Internal` context functions: ?Internal`*Periodical* ...
11
votes
2answers
383 views

backward compatibility

When producing or enhancing code, it is tempting to use recent new primitives of Mathematica introduced in version 7 and 8, but for library code or in preparation or future version change in ...
3
votes
3answers
190 views

In Mathematica 7 for Windows, is it possible to use custom GUI magnifications?

I am running Mathematica 7 on Windows XP Pro. I often use the magnification feature to zoom in on Plots, ListPlots, and ...
1
vote
2answers
198 views

How to blend some colors on a curve

I need to define a color gradient on a 3D curve, but I'm having some problems with this. Suppose we have a 3D curve defined as a parametric function of some real variable ...
1
vote
1answer
96 views

TextCell going awry due to ImageResolution (in Mathematica 7)

Can anyone see how to fix this text display? The example is from a larger project. I need to export the graphic at high resolution, but the text is going wrong. ...
15
votes
4answers
1k views

What is the right way to rotate an array?

Suppose I have an array, not necessarily square: a = $\left( \begin{array}{ccc} 1 & 2 & 3 \\ 4 & 5 & 6 \\ 7 & 8 & 9 \end{array} \right)$ I want to rotate it like one ...
9
votes
3answers
347 views

Why does Hash return different values in Version 7?

This function does not work correctly for me. The generated Gravatars do not match the ones actually produced by using the corresponding address. The problem was traced to differing output from the ...
6
votes
3answers
424 views

How to randomly erode a 3D distribution of points with Mma 7.0?

Suppose we have a 3D distribution of points, like the spherical ball example below : ...
0
votes
1answer
283 views

Table - find index of the maximum element [duplicate]

Let's suppose that I have table t = {1.23, 3.4, 10, 34, 1.78, 0.98, 12.56}. To take the biggest element I can use Max[t] ...
7
votes
1answer
106 views

$InputFileName backwards compatibility

What would be a good replacement for $InputFileName (which has been added recently to Mathematica 8) to achieve backwards compatibility with let's say M6 and M7? I ...
6
votes
1answer
285 views

PrintTemporary in ParallelTable

I thought of a possible answer to Monitor doesn't work with ParallelTable but it doesn't work as I hoped it would. This accumulates print cells instead of deleting them as intended. Can it be ...
4
votes
1answer
77 views

Animated matrix will not work?

I want to export a list of matrices as a gif so that they will appear one after another 2 seconds apart. Ive tried the following but when I open it up it only does the first two matrices, I have 10 ...