# All Questions

187 views

### How to fix Ticks in Gauges?

Ticks is an option for Gauges. I fail, however, to fix custom Ticks to Gauges. For instance, compare these two: ...
161 views

### Simplifying expression to evaluate limit as $y\rightarrow 0$

I often end up with a function that contains the term $1/(1 + x^2/y^2)$, and I need to evaluate this in the limit $y\rightarrow 0$. By hand, I can rewrite this as $y^2/(y^2 + x^2)$, but how can I tell ...
123 views

### Can I speed up the following plotting code?

I have the following Mathematica code. I do get the output graphs, but it takes like 12 seconds, on my computer. Longer still if I increase the value of n1. Are ...
100 views

### Error when compiling function containing InterpolationFunction

I'm trying to solve a coupled ODE system using NDSolve. The coupling can turn on and off in some regions, and when the coupling is off, the solution can be written ...
315 views

### Numerical Integration as Model for Nonlinear Fit

I'm trying to do a fit for parameters of a function within an integral but I'm getting errors when I try and run it. Essentially I want the following fit to work out: ...
343 views

### What's inside InterpolatingFunction[{{1., 4.}}, <>]?

I'm curious what's inside the InterpolationFunction object? For example: ...
150 views

### Error messages from compiling the Piecewise function

The following works Compile[{{x, _Real}}, Piecewise[{{{0., 0.}, x > 5.}}, {1., 1.}]] but if I enter the Piecewise[...] in ...
53 views

### Compiled version of interpolation function slower non-compiled version [duplicate]

Consider this code: ...
92 views

### Random variation inside NMaximize

I am using NMaximize as following code. ...
218 views

### StreamPlot with interpolating functions

While working my way through the Wolfram Blog post on simulating fluid flow I started playing with StreamPlot because I preferred quick and ugly visualizations over ...
255 views

### Eigenvector corresponding to a specific eigenvalue already found earlier

just a quick question that is very simple but somewhat hard to explain. I am using 4 specific eigenvalues of a large 80x80 k-dependant matrix. I found the 4 eigenvalues of interest for various k and ...
99 views

### Strange ParallelMap behavior

Let the symbol V denote an element of some vector space and nV its norm. Let lin be a linear ...
493 views

### Creating cross-version compatible documentation with Workbench

Wolfram Workbench allows you to create documentation for your own packages that is similar to the build-in documentation center. Integrating this type of documentation with the documentation center is ...
114 views

### How to pass Jacobian to IDA via NDSolve

According to the IDA manual, when solving DAEs, there is an option to supply $J = df/dx + c*df/dx'$ (where $d$ is for partial derivatives) to the IDA module. How can I do the same via ...
77 views

### Possible to Solve a LocationEquivalenceTest?

I have 5 groups, each containing around 20 elements. These elements are all dependent on x. For example: Set1 = {1.5x + 1, 2x + 0.5, 1 x + 1, ...} etc. Now, I want ...
97 views

### Generalization of a rule to N arguments

I am trying to apply a series expansion on a function x[t1,t2,...tn], with an expansion parameter a. For ...
227 views

### Speed of convergence for NIntegrate

I'm trying to optimise numerically a function that entails computing the expected value of a truncated trivariate normal distribution and this is taking extremely long -I also get warned about ...
108 views

### Saving a source file adds (* ::Package:: *) to the first line

I am running Mathematica 9 on a linux machine and I've encountered the following behaviour that I am trying to understand. When I'm editing multiple source (.m) files using mathematica saving adds a ...
152 views

### Graph rendering not working as expected

I'm running the older Mathematica v6 which seems to go through the edges of graphs twice. Is this a bug? Is it fixed on the latest version? Please just try this command: ...
86 views

### Using Dynamic to import the chronologically newest file in a directory [duplicate]

Imagine that I have a device continually and sequentially saving files to a specified directory on a Windows machine (such as [E:\ExampleDir]). Call this device a camera with some proprietary drivers ...
132 views

### How to change the start path of SystemDialogInput

It seems that every time the start directory of SystemDialogInput is always the same, is it possible to set the start directory to the last used directory? For ...
317 views

154 views

### Add keyboard shortcut to the DisplayFormula style

Is there a way to set up key bindings for the DisplayFormula and DisplayFormulaNumberedstyles? I am using Mathematica 9 on mac ...
117 views

### Unwrapping a list when invoking a function [duplicate]

The minimal working example of my problem is as follows: l = {1, 2, 3, 4} f[a_, b_, c_, d_] = a + b + c + d Now, I'd like to evaluate ...
249 views

### Integration and Parallel Computing in Mathematica

In mathematica, how would I use parallel computing (or paralleltable) to compute the integrals of $x^2$, $x$, $3x$ from $x=0$ to $10$ just like in the first answer of ...
157 views

### The limit of a product to infinity

What is the difficulty with this question to Mathematica? Is it just a problem with Mathematica v.8.0 or all versions are in trouble with it? Or is something wrong with my input? ...
89 views

### How can I set id attribute of elements when I export an SVG file?

Suppose I have a Mathematica graphic such as g = Graphics[{Disk[{-1, 0}, 1/2], Rectangle[]}] I would like to be able to export this graphic from Mathematica ...
182 views

### Remote Kernel - Error = MLECONNECT

Configuring a remote kernel with the Kernel Configuration Basic Options I manage to have a new kernel in the list of the kernel that I can open. However when I start the new kernel I get asked for the ...
115 views

### Check if an inequality holds among the solutions returned by Solve [duplicate]

Let's say I solve a system: Solve[{a == 3* c, b == 2 *a}, {a, b}] and then want to see if the values found for a and ...
270 views

My problem is that I can not load the LevelScheme Package. I am using Mathematica 8. I downloaded and unzipped the folder from this website. I saved it in the ...
208 views

### PlotMarkers don't change colour for different lines

I have a set of data and several function operating on the same data, that I wish to plot together in a ListPlot. I need different ...
180 views

### Why the dollar signs when I Solve inside a Module [closed]

I would like the solutions of my equations to be local only, so I did a Solve inside a Module: Module[{a, b, c}, Solve[{a == 3* c, b == 2 *a}, {a, b}]] and the ...
173 views

### Clear labelling gray-scale plots

I am plotting a number of functions (at least 4 in one plot) with a legend. Needless to say, it is important that it is clear from the legend which line belongs to which function. I tried to play ...
57 views

### Are FEM methods integrated in NDSolve yet? [duplicate]

About a year ago there was a discussion on these forums as to whether FEM methods have already been integrated into NDSolve in Mathematica. The answer back then was ...
120 views

### My algorithm produces too many permutations

Imagine the following problem. A population of size $n$ consists of $i$ men and $n-i$ women. The population goes to the casino. Call $g_m$ ,$g_w$ the amount of money won by men and women respectively. ...
114 views

### Mouse click on BarChart elements

What I would like to do is explore a data set by clicking on elements in a BarChart. I have some existing code which uses a manipulate which I was hoping to modify. ...
111 views

### FindMinimum gives wrong solutions inside a loop

I have a density function $\rho(r,z)$ and I want to calculate the minimum distance $d_{min} = \sqrt{r^2 + z^2}$ from the center (0,0) in which $\rho$ becomes negative. The easiest way is to find where ...
203 views

### Erfi[z] expansion in Mathematica: is this a bug?

Looking at the expansion: Series[Erfi[x], {x, Infinity, 1}] I obtain -I+E^x^2 (1/(Sqrt[\[Pi]] x)+O[1/x]^2) (note the ...
104 views

### Lossless TIFF or PNG export

I'd like to export an output from MatrixPlot[], however, the output file size seems to depend on my specification of the ImageSize -> {..., ...}. How might I export a TIFF with all of the data in the ...
198 views

### Use of RegionFunction with Graphics3D?

I'd like to plot in 3D a long list of polygons created with TetGenConvexHull, but only in regions specified by a function. Is that possible? As I have it my ...
77 views

### Make the linked images show well?

Cell[TextData[{ "(16) ", ButtonBox["[images]", BaseStyle->"Hyperlink", ButtonData->{"http://i.stack.imgur.com/gHWby.png", None}]}], "Text"] After click ...
118 views

### Taking averages at certain intervals

I am trying to take averages of a large two dimensional array at certain intervals. For example, for the first row, I want to take K averages of 500 values. Here is what I am trying ...
222 views

How can I plot this graph g1 = Table[x[i, j], {i, 5}, {j, 5}] // Grid; Rasterize@g1 I added these arrows by Ctrl+D's graphics tool. This way maybe hard ...
212 views

### Define matrix in Mathematica [closed]

How are arrays allocated properly in Mathematica? Or how are the dimensions defined? For example, I can't do testarray[[1]] = 1 or Do[testarray[[i]] = i,{i,5}] Let's say I wanted to do the ...
446 views

### Multiple notebooks in Mathematica

While working with multiple files in Mathematica, is there a way to have the names of the files appear along with the minimized window of the file. I mean that sometimes I forget which file was places ...