Questions on writing non-trivial programs in Mathematica. Do not use this tag for questions on plotting/graphics or for questions on doing mathematics with Mathematica, where the focus is more on the math than the program.

learn more… | top users | synonyms

4
votes
2answers
145 views

Finding column-wise ranks of values in a multidimensional list

I often have to find ranks of values in a list. However, Mathematica does not have built-in functions for that, or may be I'm just not aware of them. I can easily find ranks of a row/column vector. ...
4
votes
2answers
388 views

A bug fix to mathematica 10.0.1.0

There is a bug in the Wolfram Symbolic Transfer Protocol Development in C (Windows). I described it in the next answer by myself, from which I summarize: One cannot successfully compile the ...
4
votes
2answers
75 views

Why can't I pass in a product of matrices in my modified matrixform? [duplicate]

In attempt to build a function that would work like MatrixForm but would wrap a matrix with brackets, I tried the following function: ...
4
votes
2answers
240 views

About extension fibonacci

I have been trying to solve this problem, it worked slow. I know there is a efficiently way. How do I get it? The following is my code: ...
4
votes
1answer
368 views

Do “objects” in Mathematica have to be declared?

A while ago I learned a trick which allows one to imitate object-oriented programming in MMA using SubValues: ...
4
votes
1answer
99 views

How to take several values out of a large expression?

Background: Consider the following graphics directive. ...
4
votes
1answer
333 views

Path queries for tree-structured data

Can anyone suggest documentation or tutorials for developing path queries and indices for (XML-like) tree-structured data? Suppose data is organized hierarchically in key->value pairs, eg: ...
4
votes
1answer
56 views

To embed metadata in a notebook, keeping them both human readable and easily parsable

I' m trying to set up a gizmo to manage the large notebooks collection, in my Mathematica workspace. The main idea is to embed indexing metadata in each notebook and manage them by means of function ...
4
votes
1answer
131 views

“Interface” for exam

Is it possible to create a (graphical) interface with Mathematica so that instead of having a Mathematica document where I change definitions and so on, I can just input values and it will use my code ...
4
votes
2answers
135 views

Discritizing an analytical 3D-function

I have the following Problem: I need a discretized amount of points in a 3D-volume. These points satisfy a condition to built-up a 3D-geometry. In my example below I selected a helical geometry. The ...
4
votes
1answer
99 views

How to define UpValues of NBSpline when the length of argument is unknown?

I mimic the built-in BSplineBasis[] to build a user-defined function NBSpline[], Namely, ...
4
votes
1answer
69 views

How to define an expression which is differently evaluated in calculations and printed

Let's say, we have a list: values = {1.2, 0.04, 0.9}; Is it possible to replace 0.04 by some expression, which displays as <...
4
votes
1answer
222 views

How can I overload a function with multiple bracket-slots so f[a][b] and f[a] can coexist?

Maybe this is not even possible: I want to create a function f that can have two input brackets like: f[a_][b_:1]:= a*b and ...
4
votes
1answer
82 views

Constructing an Array from typed expression

I want to produce an array from expressions given by test[one][1] = 3; . . test[one][5] = 7; etc. Normally would use ...
4
votes
2answers
223 views

How can I write a Do loop that iterates over N iterators when N is not known a-priori?

For any positive integer $n$ which is not specified a priori, I can make $n$-tuple vector $v$ by v = Array[a, 1, n]. Now, given that $n$ is a positive integer which ...
4
votes
1answer
612 views

FindMinimum, NMinimize, etc. with external process

I was hoping to be able to use MMA's minimization power to work with an external process. I want to minimize the function 'TryThisNumber[x_]' which sends the value of x to something external and gets ...
4
votes
1answer
1k views

Embed CDF into an Apple iBook?

Edit From the comments I received and verifying the information about CDF at wolfram.com, it appears that it is presently impossible to embed CDF into iBooks. WRI does not appear to be happy with this ...
4
votes
1answer
55 views

How to auto-run user-interface in Player Pro

I am about to start constructing a UI that will be run with Player Pro. I have created the following notebook and marked it cells as initialization cells. ...
4
votes
1answer
148 views

How can you get the area of a region from an image?

Suppose we have a square of side "L" m, How can I calculate the hatched area, if the corners of the square are centers of circles. It can be generalized to any region? edit: This is the result I ...
4
votes
1answer
104 views

what's the meaning of “-mathlink” as part of Arg for LinkLaunch?

LinkLaunch["MathKernel -mathlink"] LinkLaunch["MathKernel"] The both code line above can launch a MathKernel. What's the difference of them? what's the meaning of ...
4
votes
1answer
153 views

Why even try the semantic constraints, if expression can't match the pattern structure?

This result is unexpected: Trace[MatchQ[{7}, {_?NumberQ, __}], NumberQ] (* -> {{NumberQ[7], True}} *) Why evaluate NumberQ...
4
votes
1answer
170 views

NumberForm and units

NumberForm can be used to print Quantities to a specified precision. For example, x=Quantity[5.123456789,"Meters"]; 5.12346 m Print[NumberForm[x,{4,2}]] 5.12 m ...
4
votes
1answer
170 views

Transform sequential cell operations to programmatic workflow

Let's say I have a workflow that involves importing images and turning them into an animated gif. Here's how I currently have it setup: Import Images: ...
4
votes
1answer
157 views

Can I do constraint programming in Mathematica? [closed]

I would like to know if there is a way to do constraint programming in Mathematica? I think there are no built-in functions, but maybe some of you know some additional packages addressed to the ...
4
votes
1answer
182 views

ControlType -> None Vs. Module inside Manipulate (i.e. making everything local)

I'm building a program on another one made available in the Wolfram Demonstration Project. I've noticed that in the original code (working flawlessly) many variables were made local inside the ...
4
votes
1answer
169 views

How to set the position of the palette when use CreatePalette[]

When using CreatePalette[], the palette created always shows up on the upper left corner. Is there a way to make it show up at the center of the screen, just like ...
4
votes
1answer
144 views

Determining End of Notebook with Mathematica 9

The application package I had working in Mathematica 8 no longer works in Mathematica 9. I believe the problem lies in how I cycle through cells and test for reaching the last cell of the notebook. ...
4
votes
1answer
100 views

Slowdown of Flat attributed function

I was trying to write an associative function f using the attribute Flat. ...
4
votes
1answer
143 views

Selecting expressions from a sequence that are not subexpressions of earlier elements

I have a While loop that generates and prints an expression on each iteration (there can be thousands of iterations). UPDATE: Some expressions are generated in ...
4
votes
1answer
88 views

Combination of CellPrint and PrintTemporary, or DisplayForm for Cells

I'm programmatically generating some formatted output that generates a cell in the form of a Cell[] expression. For instance, the output might be ...
4
votes
1answer
260 views

speed up iteration with conditionals plus optimize memory usage

Given list1 and list2 whose elements are vectors of a certain (fixed) dimension, I am interested in the behaviour of a scalar ...
4
votes
1answer
716 views

How to combine a set of Plots, including self-drawn Inset/Lines/Circles?

I have a set of 9 plots which should be combined into one plot. Each of these plots contains a ListContourPlot, some circles, lines and an ...
4
votes
0answers
126 views

Learning the Wolfram Language ‘from the bottom up’ [duplicate]

I'm a armchair programming-language theorist, and I know … quite a few programming languages, some to extensive depths. (Hell, I've built more than my fair share.) Most of the information I've found ...
4
votes
1answer
522 views

How can I invoke the solution of NDSolve to determine a parameter in my equation just inside NDSlove?

I am trying to solve a differential equation by NDSlove for $h(x,t)$. It reads $$h_t=h_{xx}-V_h-\lambda(t)$$ where $V_h$ is a given function of $h(x,t)$ denoted by <...
4
votes
0answers
317 views

Call Haskell from Mathematica and return the results inside Mathematica

I would like to learn Haskell using Mathematica's environment. I know there is the RLink protocol. Is there a similar protocol for Haskell?
4
votes
0answers
114 views

Is there a way to check whether two notebooks share the same variables?

When I code in Mathematica, I often re-use code from old notebooks which fulfilled a specific purpose; for example, one testing for soft matches in strings, or one that identifies outliers on a graph ...
4
votes
0answers
83 views

How to insert expression matching the format?

I would like programmatically to insert/write an expression at the current insertion point, but matching the current format, such as font size and style, so that it looks like the user typed it. ...
3
votes
3answers
647 views

How can I suppress Print in parallel evaluation?

When using a function that includes Print statements, one can suppress the output by ...
3
votes
2answers
154 views

Localizing Pattern Names

When I want to define a function that uses a pattern, how should I localize the pattern name (i.e., x_ localizing the symbol x)? ...
3
votes
2answers
229 views

How to create an ImagePartition type-of-function that generates parts of different sizes

Background: I partition images to polygons ( squares ) and color them with VertexColors. I want to use a minimal number of polygons while still showing a clear resemblance of the original image. - ...
3
votes
2answers
187 views

The value of an option inside a native function

I'm looking for something similar to AbsoluteOptions but that can be evaluated inside the function. That is, I want to read the absolute settings of options ...
3
votes
2answers
216 views

How can I create a 3D representation of an object with known coordinates and adjacency table in mathematica?

Basically I want to create an object with specified coordinates and adjacency table, like in page two of this article. I'm completely new to using Mathematica, any help would be great! EDIT: So I ...
3
votes
2answers
206 views

Plotting: DensityPlot produces artifacts

I am trying to plot the electric potentials of bouncing balls using the following code: ...
3
votes
2answers
1k views

Forecast Future Stock Prices - Brownian Motion - Again

excuse me, I think I have here a technical problem with Mathematica yesterday I posted the question with the title: Forecast Future Stock Prices - Brownian Motion I am still not very experienced but ...
3
votes
2answers
180 views

Merging Financial Time Series

I am trying to merge two or more financial time series. For example, ...
3
votes
2answers
356 views

How to force Return[] to return from an arbitrary point (like in C++)?

I need to test some complicated conditions to calculate a Return value. But MMa doesn't let you Return[] from anywhere the way C++ does. The structure of my Module is similar to this: ...
3
votes
2answers
614 views

Dynamic lists as function arguments

Suppose I have a function that requires a list is as input. I.e. f[list_]:=DoSomethingWithList Now, if I pass a variable as Dynamic like this ...
3
votes
2answers
97 views

How do Forms affect the interpretation of Expressions?

Below are three formats for representing an undirected edge between vertices a and b: ...
3
votes
2answers
144 views

Why the function cannot achieve the expected result?

Today, I write a toy code (Framed the prime in a list) to practice Mathematica programming ,which as shown below: Trail 1: ...