# All Questions

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### Is there a built-in function to map a list of heads to a list of data?

Assume that this built-in function is called func. What I want is func[{f,g},{a,b,c}] will return the following result: ...
43 views

### Dependency injection - use a specific implementation of one function within another

Consider... f[x_]:=Body containing h[some args]... g[x_]:=Body containing h[some args]... However I want to define something like... ...
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### Sinchronicity and probability

"Synchronicity is the experience of two or more events as meaningfully related, where they are unlikely to be causally related. The subject sees it as a meaningful coincidence." Wikipedia First, I am ...
16 views

### What are the best Mathematica tips in Michael Trott's beer/whiskey post?

Michael Trott posted this incredible tour-de-force on the wolfram blog: http://blog.wolfram.com/2014/08/19/which-is-closer-local-beer-or-local-whiskey/ The length of the post is overwhelming, so I'm ...
27 views

### Problem with machine number precision in compiled functions

When I compile a very big function and give it input the function returns error. I realized that this is because the value of the function becomes smaller than the smallest machine number. Is it ...
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### How to graph the revolution of solid limited by 2 points in x axis

I'm learning how use this program. And I have problem with how graph the solid of revolution.Here i write one exercise. y=2-1/2x, y=0,x=1,x=2; about the x-axis. This is the graph also the volume ...
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### Help with coding triangular nodes/elements

I'm trying to write a program where it will shoot out the triangle node numbers. For example, in the picture, if we choose to divide this triangle by 5 points, then the program will return out the ...
2k views

### How to find the period of an arbitrary mathematical function?

Is there a function to find the period of an arbitrary (possibly complex) function in Mathematica?
49 views

### Window ▶ Show Handwriting Input

How might I force Mathematica to display the Handwriting Input menu? Currently I'm on W7 using a Wacom Tablet and unable to find the Handwriting Input option. It doesn't display under Windows>.
27 views

### Part specification error only in LogPlot

I've a problem. I defined a simple list and a function like below: lst := {5, 10, 20} f[m_] := lst[[Floor[m/10]]]; and drew a plot ...
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### Formula for a 15 - Puzzle game (Backwards and forward solution)

So I currently code a 15-Puzzle Game. Every tile has position starting between 1 and 16. For example has a tile which is at the position where number 3 should be the position 3. Now I need to find ...
1k views

### Checking if a point is in a convex 3D polyhedron

Extending from these questions How to check if a 3D point is in a planar polygon? and How to check if a 2D point is in a polygon?. I'm trying to do this to render specific shapes made up of spheres. ...
135 views

### How to test if all the elements in a list are Integers? [closed]

Consider a list such as s={1,2,3,3,5,6,3} With IntegerQ[number] , you know if number is an ...
307 views

### What is available for editing Mathematica source code with Emacs?

I can find several Emacs libraries for Mathematica, but I'm not aware of a clear favourite, a definitive list, or of a library which is actively maintained and developed. None of these appear to be in ...
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### How to generate random points in a region?

The Mathematica 10 documentation was updated for FindInstance adding support for regions. In my use case I'm trying to sample points in a set of disks: ...
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I use ...
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### How to make a depth map from a 3D model?

Given a 3D .obj model, for example a rabbit. How can we make a depth map out of it? Any idea or help would be much appreciated.
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### Find file names in directory

I am trying to find the list of any file in any directory of a given name (by in the directory, I mean directly in the directory, so in a directory which is in the directory would not count). For the ...
49 views

### What is this type of chart called? [on hold]

What is this type of chart called. I have heard pictorial mentioned but are there other names? Is it defined anywhere? Simply shows proportion and type. Thanks.
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### Return value of Reap when using tags

I've noticed a behaviour of Reap that I don't quite understand yet. Suppose I want to Sow several values during a computation. ...
261 views
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### Proving the hairy ball theorem using xAct

I would to formally prove the hairy ball theorem in Mathematica, initially just for the $S^2$, and then see about generalizing. An approach I thought about to use the xAct package to define $S^2$ and ...
394 views

### Create a planar graph from a set of random points

A planar graph is a graph embedded in the plane in such a way that the edges intersect at vertices. This is an example of a planar graph: g = GridGraph[{3, 3}] ...
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### Bad fonts in Mathematica 10

In Mathematica V10, the glyphs for mathematical and/or other special symbols are wrong. I see this in input cells and also in the Basic Math Assistant palette. How do I solve this problem?
200 views

### Integral converging in M9 but not in M10 [on hold]

Background: Mac OSX 10.9.4, Mathematica 9.0.1 vs. Mathematica 10.0 (both versions are Student Editions). I have a notebook. It used to evaluate fine in Mathematica 9. I upgraded to 10 and, without ...
71 views

### Horizontally compress a picture with varying compression ratio

I have a function c[x] whose domain and range are both [0,1]. And I have a picture with width W, height ...
121 views

### Export to PDF on OS X, font missing on Windows

Here is another problem with Mathematica plots and PDF. I have Mathematica 9.0.1 on Mac OS X. I want to export my plots to PDF to include them in a LaTeX document. If I export the plot with the ...
25 views

### Importing multiple images for machine learning classification

I want to create a ML classifier using images just like this example. I have two classes of images in two different folders. Is there an easier way to import all images from both folders rather than ...
36 views