# All Questions

1answer
276 views

### How to save data using FileNameSetter or similar

I would like to export data to a file using a SaveAs type dialog, using something like FileNameSetter[name,"Save"] to give a browse button. Any help with this ...
1answer
375 views

### Implementing Central Symmetry

I'm interested in implementing symmetry groups. So it would be useful to have central symmetry (isometry transformation). There are built-in functions: ...
3answers
224 views

### Pattern matching Q for rectangular data matrices

Given a List of rectangular nx3 arrays of data, each of the form {...,{x,y,z},...}, (the ellipses are not Mathematica pattern syntax, just for illustration). Some members of this list may be - by ...
1answer
146 views

### Set promotes Rule to RuleDelayed?

In mentally building a model of how Mathematica works, I naively expected Set to create a Rule in a symbol's ...
1answer
163 views

### Accessing the Options of the parent Cell

From within the Kernel, it is possible to access a Cell's options using CurrentValue. For instance, in a ...
2answers
711 views

### What is the Mathematica equivalent for the Excel function tinv()?

TINV() returns the t-value of the Student's t-distribution as a function of the probability and the degrees of freedom. For example ...
5answers
3k views

### How to draw an ellipse arc in 3D?

There is no Circle or Disk object in 3D. I quickly found a way to use Cylinder (thin lines, no faces, very flat): ...
4answers
224 views

### Leave expression tree formatting the same when a replacement rule is applied

If I type e1 := 3 x + 2 (1 + y) z // TreeForm, I get an expression tree. If I then type e1 /. x -> 3, I get another ...
1answer
230 views

### Graphics copy paste

Background. I have a function ( stored in a package ) that creates 2D graphic images, its prototype looks like this: ...
1answer
315 views

1answer
601 views

### CUDALink not working on Linux-64 and Asus GTX460

On my hardware I have a CUDA enabled video card an ASUS GTX460, yet Mathematica does not seem to recognize this. I have: CUDA Toolkit 4.1 CUDA SDK 4.0 NVIDIA Driver 295.49 on Sabayon Linux 64 ...
1answer
691 views

### CUDALink not working on Mac OS X

On my MacBook Pro, I have a CUDA enabled video card, yet Mathematica does not seem to recognize this. For example, following the CUDALink Setup, I get ...
4answers
410 views

### Plotting the components of a function that returns a list in different colors without redundant evaluations of the function

I have a function f which takes a number as input, and returns a list of numbers (the length of the list is constant). f is hard ...
2answers
1k views

### Creating a graph with variable size of vertices and variable thickness of edges

I'm trying to create a graph to represent transitions between different states of a system. I would like to represent the time the systems spent in a state with the size of the vertex and the ...
3answers
848 views

### Solution for equation system with piece-wise defined functions

As I could swear this worked just yesterday, I am probably just doing something stupid here and I am sorry to bother you :) I am trying to find the point where a curve crosses a line. In this case, ...
1answer
332 views

### How can I eliminate a function in a system of PDEs, Maple-style?

Maple can separate and eliminate a function in a system of PDE equations, with casesplit in the PDEtools package. How to do ...
3answers
881 views

### How can I set up a versioning system within a notebook?

Since the Frontend crashes a lot, for important work it would be nice to have the notebook automatically branch and save itself every so many minutes. For instance, commands like ...
2answers
688 views

### Eliminate doesn't work in Mathematica

Hello Mathematica users, I have problems trying to eliminate variable $Q(x,y)$ froma PDE, but Mathematica output is just True. The problem is that I already found ...
4answers
459 views

### Distances between points in periodic cube

How can one implement more efficiently/elegantly/memory savvily the following function which returns a matrix of all Euclidian distances between points in 3D within a cube of width ...
1answer
209 views

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1answer
2k views

### Global precision setting

Coming from Maple I do not understand how the precision for numerical computations in Mathematica is specified. I understand that there are various options to commands such as ...
2answers
1k views

### How do I keep the right ordering of eigenvalues using Eigensystem?

I'm having an issue with the Eigensystem command. I need to diagonalize a bunch of 3 by 3 complex valued matrices, but more importantly, I need to keep the exact ...
3answers
947 views

### Suitability of Mathematica as platform for engineering calculations and programs

I am considering using Mathematica with Wolfram Workbench as a standard platform for calculations and programs in a large engineering department. I am looking for a solution that would provide better ...
1answer
2k views

### Importing CSV financial data in Mathematica

I am trying to import a CSV file in Mathematica 8 with the aim of charting it with the TradingChart command. This is what I have done : ...
1answer
910 views

### Graph vs GraphPlot

What is the difference (in purpose) between Graph and GraphPlot? Which function is bested suited to which tasks? Background: I ...
1answer
326 views

### Defining Tags in Reap

I am trying to use Sow/Reap to replace Append in my code. The problem is that I need to ...
1answer
201 views

### Different determinants on 2 different computers

Is there any way to force Det to do itself in a certain way? I've been running the same notebook on 2 differents computer, one MacOSX Lion and one W7 (both 32bit) ...
0answers
114 views

### Using citations with Workbench

I have written a tutorial (.nb file) for a package using Workbench. In the tutorial there are some citations created with the recently introduced citation management system. They are simply numbered ...
1answer
2k views

### Is it possible to set a variable as a positive one in the whole notebook?

I'm having issues during integration due to the fact that Mathematica doesn't know if an undefined variable is positive or not (it gives me complexes which bothers me in the end). For example I do ...
3answers
881 views

### Is it possible to position ticklabels on the negative y axis on its right side?

Is it possible to position ticklabels on negative $y$ axis on its right side? Ticklabels on positive $y$ axis should remain as usual:

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