# All Questions

634 views

### How do I perform string matching and replacements?

What are, and how do I use Mathematica's string matching and replacement tools?
207 views

### Safely nesting RuleDelayed

Say I have the following, straightforward-seeming functions: ...
1k views

### The difference between 0. and 0

I have a function for which 0 is a special case: f[A___, 0, B___] := 0 But since I am doing numerics, sometimes in the course ...
161 views

### Emulating Sequence with my own function

I just considered if/how one could implement Sequence in Mathematica if it were not predefined. It turned out that the following simple definition has in all my ...
170 views

### Remove anything between () except for ; in a string

A simple question but I can't find the answer. I'm scanning a huge pile of mails and would like to get rid of anything between () in the email adresses since this normally contains just info that ...
563 views

### Use ColorFunction in ListLinePlot with If

The following code ListLinePlot[{2, 4, 6, 8, 10, 12}, ColorFunction -> Function[{x, y}, If[x <= 3, Blue, Red]]] should produce blue lines for $x\le3$ and ...
98 views

### Is there a way to programmatically do a “save as ” on an init.nb file to save it as init.m?

I am using Mathematica 8.0.4.0 running under Windows 7. Is there a way to programmatically do a "save as " on an init.nb file to save it as init.m? In the documentation center under ...
245 views

### Why does my function defined with constraints on patterns not work? [duplicate]

Possible Duplicate: Why doesn't PatternTest work with Composition? My function is something like this, ...
366 views

### What is the precedence of FrameStyle, FrameTicksStyle, and LabelStyle? How to have a LabelStyle different from FrameStyle

From the documentation: Plot[2 Sin[x], {x, 0, 10}, Frame -> True, FrameLabel -> {x, y}, PlotLabel -> 2 Sin[x], LabelStyle -> Orange] But then add ...
348 views

531 views

### What compilers are “suitable” for CompilationTarget->“C”?

The documentation for CompilationTarget says, "if you do not have a suitable C compiler then you will not be able to set CompilationTarget to C". Well at this time, I don't have a compiler installed ...
247 views

### Why do I have to put Evaluate[] here

I wanted to draw some contours. I succeeded with this: ...
378 views

### Different calculation of median and quartiles, bug in BoxWhiskerChart?

When you plot a dataset with BoxWhiskerChart passing over the box in the plot with your mouse pointer shows some specifics about the dataset (min and max values, ...
141 views

### How to reduce expressions with complex coefficients in the form of a+0.*I

I'm trying to get an eigenvalue equation in Mathematica, and the result is an expression with coefficients of the form a + 0. I. For example, Is there any clever ...
220 views

### HoldFirst and inserting additional options into a Grid of Graphics

This is related to my earlier question, but is specific to an issue I have encountered with the use of the HoldFirst First, let's create some fake data for ...
240 views

### Having difficulty with the Minimize command

I am having trouble getting an answer to this question...Am I missing something that anybody can see. ...
818 views

### Do I have to code each case of this Grid full of plots separately?

I have written some custom functions to draw multi-panel graphs like this one: It's done by passing a matrix of (custom) plotting functions to a MultiPanelGraph ...
685 views

### Calling external commands without showing command prompt on windows

I'm playing around with some code that's calling external command-line commands on a windows platform, and when doing this, the command prompt will pop up quickly and then disappear. This is not a ...
257 views

### Error Interpretation in NIntegrate

I am using a recursion algorithm developed by Migdal for Lattice Field Theory, and I have the following code: ...
769 views

### Converting ConditionalExpression to Piecewise

I have Solve[] return a list like ...
2k views

### Plotting complex Sine

I've got another plotting problem. I want to plot Sin[z] where z is complex. So, I've tried the following: ...
605 views

### Is there any way to obtain an approximate inverse for very large sparse matrices?

I have a very large sparse matrix and I need to obtain its approximate inverse and save it as an sparse matrix too. Any of my efforts as could be seen in what follows fail for large n ...
1k views

### Formatting Ticks and FrameTicks labels with a function

Is there a convenient way to format tick labels? In this example I would like to use the default Mathematica tick intervals, but simply convert the X axis labels to strings with "s" added. As you ...
399 views

### How can I change the CDF which imports the data and uses it, without execution of code

I am making an application which first imports the data from the Excel file and then uses it in the deployment of a CDF. But is it possible to change the data of the Excel file and see its ...
901 views

### How to deal with complicated gaussian integrals in Mathematica?

As we know, for most Gaussian integrals, we can get the analytical result. Now I have many Gaussian integrals to treat, which have the following general form, ...
411 views

### How to solve a Differential Equation with DSolve with Function Coefficient?

Suppose I have v[x_] = (1.453 Sech[x + 1])^2 + I Sech[x + 1] Tanh[x + 1] And I have to solve the equation: ...
154 views

### How to display cell groups in documentation pages

I recently introduced my WildCats package in the Meta Thread What third-party packages do you use? and @Szabolcs promptly observed that: "I noticed that there are many cell groups in the documentation ...
645 views

### Exporting a Large Multidimensional Sparse Array

I'm trying to export a sparse array from Mathematica to share with collaborators who primarily use Matlab. The sparse array in question is 4 dimensional, (72 x 93 x 94 x 172) with ~4M non-zero ...
325 views

### How can I use nested conditionals inside my functions?

I'm a big fan of using conditionals inside my functions to deal with cases, that is, to pattern match in stages and possibly leave a function unevaluated. ...
I would like for the autocomplete feature to search through contexts, for example if I have a symbol named ABCMyFunction, when I type A and press "cmd + shift + k" it will complete it. Edit To ...