# All Questions

551 views

### Stereographic Projection

Say I want to represent points of the complex plane in the sphere $\Bbb S^2$ using stereographic projection. That is, the Riemann sphere: Specifically, it would be nice to be able to: Given the ...
240 views

### Storing data in the Notebook in readable form

The common problem in my theretical work is a need to import some experimental data to work with. This means that my notebook depends on some external files which makes it difficult to share it with ...
113 views

### Using enum values with J/Link

How can I pass enum values to a function when using J/Link? What is the correct syntax for typing an enum value? For example, call normalize() using ...
419 views

### How do I put an image on the complex plane?

I watched this video and became interested in transforming an image. But I have no good idea on how to embed an image in the complex plane using Mathematica. I have a method that seems to work, but ...
189 views

### How to find the name of the current function

I would like to know the name of the current function from within that function. For example, consider the following code ...
241 views

### Histogram3D using sums instead of counts

I'm trying to create a 3d histogram/ matrix plot pair. My data is in the form {{TTR1,TBF1},{TTR2,TBF2},....} What I would like is to modify the Histogram3D so ...
339 views

### Efficiently extracting an array subset given a separate array

I have two arrays. The first array consists of tens of millions of rows and three columns with a string, a number, and a string. ...
253 views

### Concatenate strings from different levels of list

After a lot of trouble I've finally come pretty close to what I want to do. I now have a list that looks like this: ...
334 views

### How to stop Animate animation when reaching a defined value

I have following code Animate[ Plot[myvariable x,{x,0,100} ], {myvariable,0.1,1},AnimationRunning->If[myvariable==1,False,True] ] How do I make the animation ...
484 views

### Define an 'inner product' with AngleBracket

I want to define my own little 'Inner Product' function satisfying properties of linearity and commutativity, and I'd like to use the "$\langle$" and "$\rangle$" symbols to output my results. For ...
431 views

### How do I designate arguments in a nested map?

Say I have two lists, list1 = {a, b, c} list2 = {x, y, z} and I want to map a function f over them to produce ...
1k views

### In finding a logarithmic fit for some data (of the form a*Log[b*x]), WolframAlpha succeeds where Mathematica 7.0 fails, why?

I would like to fit a function of the form: $a \log(b x)$ to a set of data: ...
193 views

### Is it possible to define more than 9 shortcuts for notebook cell styles?

You can define shortcuts for notebook cell styles in the stylesheet editor, by adding MenuCommandKey->"7", etc. to the style definition. That is, you can define ...
588 views

### Why does importing a URL fail the second time and produce a FetchURL::conopen error?

I have Mathematica code that uses Import[] to download URLs. I noticed that first time I use the Import[] command it works. ...
335 views

### How To Span Table Headings?

What I am doing wrong? I would like to get a header to the table and based on your code I tried this: ...
432 views

### position of sequence of elements in list [duplicate]

Possible Duplicate: Finding a subsequence in a list Question The position of {3, 5} is the list {1, 3, 4, 3, 5, 5, 1} is 3. How can such a position ...
1k views

### FeynArts not working properly

So I have installed all FeynArts folders (from 3.5 to 3.7) with FeynCalc 8.0.1., and none of it is working properly :\ First I load the path to specific FeynArts package (3.5 for instance), then, by: ...
195 views

### Computers running Wolfram lightweight grid manager won't fall asleep

I have a computing environment comprised of: 27" iMac with dual cores running Mac OS X 10.6.8 and 2 XServes each with 2 quad cores running Max OS X Server 10.6.8 All networking by ethernet to a Time ...
114 views

### Calculating a limit with a result that is discontinuous in the parameters

The following limit is left unevaluated (Edit: added the assumption that $\epsilon$ is real thanks to the comment below): ...
148 views

### Why is SystemDialogInput failing to return a save file path?

I am encountering a problem using SystemDialogInput within a Button. The code below shows what I am doing. To test this create a ...
772 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, ...
156 views

### “Not a valid Filling specification” error

I have a function, which plots the given function array f. This is a part of the function: ...
224 views

### Can we know the background code associated with basic mathematica functions

I wanted to know how computers calculate basic functions like Sqrt so first I checked how humans do it I found that they use something called "Newton's method" that ...
972 views

### ListContourPlot-ColorFunction

How can I use ONLY the central 90% of the spectrum, not the whole range? For example, I do not like to see the lowest values in purple, but in deep blue color. ...
279 views

### Create self-contained plots when Ticks or FrameTicks require external functions

Let's say I define tick marks for a plot in a separate function outside of the plot: ...
321 views

### Make EventHandler work for clicks and keys in a Dynamic display

I am trying to write a way that will do certain events depending on what screen is showing. What happens so far is that the screen will change in accordance to a click, but when you try to do the ...
148 views

### Impossible to bypass evaluation on returned values?

Following all the great advice on this other question, I'm now fluent with HoldAllComplete and Unevaluated on the input side of ...