Questions tagged [version-7]
Version-specific issues for Mathematica 7 (other than bugs).
95
questions
28
votes
5
answers
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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 ...
15
votes
3
answers
2k
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 <...
13
votes
6
answers
1k
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
...
13
votes
2
answers
2k
views
Problem importing URL with Greek characters
I'm considering buying a car. So I thought why not make a web-crawler in Mathematica to pile-up car data? Brilliant idea.
Then I found this Greek website, gocar.gr, which just so happens to have all ...
13
votes
2
answers
468
views
Internal "Periodical" functions in version 7
In version 7 there exist these Internal` context functions:
?Internal`*Periodical*
AddPeriodical ...
13
votes
2
answers
1k
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 ...
11
votes
4
answers
338
views
How to plot $x^2$ over $-5<x<-1\cup1<x<5$
Is it possible to plot a function over a interval with a gap in the middle; e.g., $f(x)=x^2$ over $-5<x<-1\cup1<x<5$?
I am using Mathematica 7 and most of the options in the answers don't ...
11
votes
1
answer
1k
views
How to add a fading trail effect in Animate?
I would like to add a smooth fading effect to the end of a curve, while it is animated. Here's a minimal working example which shows a particle moving on a circle (the circle is drawn while the ...
11
votes
1
answer
1k
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 ...
10
votes
2
answers
7k
views
Legends in combined Plot and ListPlot
I have a set of data
...
8
votes
1
answer
193
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 ...
7
votes
2
answers
1k
views
Graphene bilayer rotation
How can we design the rotational picture of bilayer graphene using Mathematica 7.0 like in the figure? This gives Moire pattern
7
votes
3
answers
771
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 :
...
7
votes
1
answer
2k
views
Mathematica: Label specific vertices in GraphPlot
How can I label particular vertices in GraphPlot? And have the arrows space out accordingly, for the width of the label?
I have Mathematica 7, but I think this question applies to all versions.
Edit:...
7
votes
2
answers
615
views
Tick marks shrinking with ImageResolution [duplicate]
High resolution PNG export is handy for print quality plots, however tick marks are not scaling properly. Does anyone know a solution or a work-around, preferably for M7 (on Win7)?
...
6
votes
2
answers
357
views
How to generate randomly curved and twisted strings in 3D?
Here's a code that draws a set of random straight lines in 3D:
...
6
votes
1
answer
2k
views
Sorting an Array with words in different languages
Array consists of words of different languages. I need to sort elements in reverse alphabetical order and make a list of elements, which consist of english letters.
Example of array which consist of ...
6
votes
1
answer
4k
views
How to take the derivative w.r.t. an arbitrary function?
EDIT: The answer posted by @Jens works for built-in functions only. However I'm starting to wonder if this is related to my Mathematica install somehow. I have version 7. Here is an example in the ...
6
votes
2
answers
615
views
NullSpace[_, Method->"OneStepRowReduction"] is sometimes wrong; how can I work out when this happens?
Edit 2015: Has this been fixed yet?
(This is on MMA 7.0.1.0 on OS X)
I've just found a large matrix m for which NullSpace[m] ...
5
votes
1
answer
311
views
Exported animated gif with matrices 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. I've tried the following but when I open it up it only does the first two matrices and I have ...
5
votes
1
answer
216
views
How to get fuzzy points in a 3D view?
I would like to produce fuzzy random points (sprites like) in a 3D view. Applying a Blur command doesn't do the trick since the view is then frozen and we couldn't rotate the view anymore, and I don'...
4
votes
3
answers
365
views
How can I add a few specific mesh (altitude-like level) curves to a plot?
I'm plotting the numerical solution of a differential equations, using the altitude-like level curves as a mesh. It's fine, but I would like to add three specific altitude levels as thick red, green ...
4
votes
3
answers
454
views
How to draw random colorfull domains in a plane?
I'm trying to produce some graphics like the one shown below, with a few adjustable parameters to change the number and size of cells. The cells positions, sizes and colors should all be random (size ...
4
votes
1
answer
658
views
Plot: How set markers in plot in front of axes
I draw a plot using ListPlot. But I noticed that PlotMarkers are 'covered' by the axes; see example below:
I was trying to use ...
4
votes
1
answer
139
views
Is it possible to enable syntax highlighting for \[Function]?
This is a bit of a long shot but I am wondering if it is possible to enable syntax highlighting in a function defined with \[Function] without resorting to anything ...
4
votes
1
answer
132
views
Small output glitch with Histogram
I'm experiencing a small formating glitch with an histogram. I want to define an histogram with a square frame, with precise vertical ticks from 0 to 10. But I'm still getting a larger range, and I ...
4
votes
1
answer
510
views
Sporadic bug in Mathematica 7.01.0 MatrixPower and/or Eigensystem functions on floating-point symmetric matrices with repeated eigenvalues
Note: From the comments submitted below by other StackExchange users it appears that this apparent bug was fixed sometime after version 7.0.1.
I asked a vague variant of this question a few days ago, ...
4
votes
3
answers
249
views
How to draw borders around tiles of the same color?
I'm having difficulties with a project to show random tiles with a few random colors. Here's the code that I need to modify:
...
4
votes
0
answers
130
views
Error with String patterns producing Removed["$$Failure"]
While working on How to capitalize the first letter of each word in a string and trying to understand why certain characters were not considered letters I tried this:
...
3
votes
3
answers
2k
views
Random non-overlapping disks in a square
I've found a nice code snippet by @belisarius from this question, that I'll reproduce here for reference:
...
3
votes
3
answers
882
views
Colorize a 3D distribution of points according to density
Suppose we have some random 3D distribution of points. I'll use the spherical ball defined below as an example and a starting point for the discussion here :
...
3
votes
1
answer
195
views
How to define a smooth function of random bumps in a plane?
I would like to define a simple function that gives random smooth bumps in a plane, a bit like the clumsy picture below, but it should be continuous:
...
3
votes
3
answers
109
views
Reduction of repetitive calculations in Table
If I generate two tables inside a function which are
function[n_, x_, y_]:=(
table1 = Table[i* x/n^x, {i,1,n}];
table2 = Table[i* y/n^y, {i,1,n}];
)
where <...
3
votes
1
answer
513
views
ListPlot - plotting values with different range
I have three tables: L, S and U. In first table I have values from range (0,1), in second ...
3
votes
1
answer
593
views
How to align text to left and output to right, in manipulate?
I need to show a layer of information on a 3D graphics, inside a manipulate box. Currently, all the code is working great, except that the text should be aligned to the left, while the output numbers ...
3
votes
1
answer
167
views
Bug with LinearProgramming on Integers?
With Mathematica 7:
LinearProgramming[{1, 1}, {{0, 0}, {1, 1}}, {1, 1}, Automatic, Integers]
gives wrong result {0,1}. But
<...
3
votes
2
answers
499
views
How can I style a TabView?
I have been trying to style a TabView like in the examples on the Wolfram CDF site, where they have custom sizes and backgrounds with images or gradients, but I am ...
2
votes
2
answers
2k
views
How can I add a checkbox to a Manipulate expression?
I'm looking for a simple example about how to add a simple On-Off switch in a manipulate function.
More specifically, I defined a curve with two parameters. One is a continuous parameter that is ...
2
votes
2
answers
192
views
How to mix symbols and text for labels in manipulate? [closed]
I'm creating a big manipulate box with several sliders, and each slider must have a small explication text (units, for example) after a mathematical symbol. As a simple example, here's the code I'm ...
2
votes
1
answer
6k
views
ListPlot doesn't shows all points [closed]
I have a table:
p1 = Table[(Binomial[2000, k]*StirlingS2[1386, k]*k!)/(2000^1386), {k, 1, 1386,
1}];
I used ListPlot[p1] ...
2
votes
1
answer
412
views
Alt+Gr issue with Mathematica 7 on linux
I have the same issue as described in
https://matteochinazzi.wordpress.com/2010/04/12/mathematica-alt-gr-issue-under-linux/
So basically whenever I use AltGr to write [ or ] in Mathematica, it ...
2
votes
2
answers
343
views
How to define the density of random 3D points and plot it?
The following code draws a random distribution of particles in 3D. The Manipulate box allows to change a few parameters (number of particles, size of clusters, ...). I would like to define the local ...
2
votes
1
answer
82
views
How to insert variable height in this random bumps function?
I'm trying to insert a "time" variable that control the height of the random smooth bumps, but I'm yet unable to do it right, as shown with the code below:
...
2
votes
1
answer
499
views
How to extract the bin width from a Histogram made with an automatic binning method?
I am using the Scott binning method with Histogram and Histogram3D to plot some data. How could I find out the bin width chosen ...
2
votes
1
answer
154
views
How to make this moving surface a continuous and derivable function?
I'm having troubles in defining a function of three variables: $t$, $x$, $y$, from a moving bumpy surface that should be derivable relative to its three variables. Here's the animated surface code, ...
2
votes
1
answer
91
views
Error with comments inside and expression
I found this strange parsing error with comments inside of an expression in Version 7. And example is
{{1, x}, {1, y} (* {1, z (= 5+6)} *)};
It occurs depending ...
2
votes
1
answer
473
views
Warning and Errors during Compile
I defined a compiled function
cf = Compile[{{x, _Integer}, {n, _Integer}},
z = (n^x);
Binomial[n, #]* StirlingS2[x, #] *(#!)/z & /@ Range[x]];
and I ...
2
votes
1
answer
1k
views
Repeated convergence test failure and why?
i have assigned all the values and the ODE assigned is as this
...
2
votes
1
answer
271
views
Random phases at each run in a wave superposition [closed]
I need to define a function which generates a random real number between 0 and $2\pi$, as a random phase constant for a wave superposition. The output should be different each time I re-run the code, ...
2
votes
1
answer
1k
views
Place legend without border above the plot
I use Mathematica 7.0 and as far as I know, there is not method PlotLegends, only PlotLegend. I want to set my legend - without background, shadow and frame - above my plot, as in the example belowe:
...