Questions about the generation and use of compiled functions using Compile.

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3
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0answers
42 views

Why Function is compiled?

Function isn't mentioned in the list of compilable function, but it can generally be compiled when it's formed by compilable functions, a simple example is: ...
11
votes
1answer
423 views

What function generates random numbers in a compiled function?

I am writing a simulation for 2D random walk. I wrote several version of code, and found that the speed is like this (fastest to slowest): C++, Mathematica compiled procedural code, Mathematica ...
0
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1answer
75 views

How to efficiently compile this function? It involves a 3-index Table [on hold]

Consider a 2-dimensional lattice with LxL sites. Each site has 4 neighbors, and we can then define a function (called below ...
1
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0answers
66 views

How to use Wolfram language in an external program with low latency?

Im using Wolfram language on Pi B,and I want to compile a '.m' file (like "test.m" that contains Wolfram functions), in an external program like a C/C++ and then Export the output in an image file ...
5
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0answers
77 views

Compiling FoldList implementation for RK4

Original I'm looking to write an integrator for a function of two variables. Here is my implementation for the RK4 update rule using FoldList. ...
3
votes
0answers
74 views

speed up evaluating a listable function

I apologize in advance for the vagueness, but I can't think of a more descriptive title. I am trying to find the average value of the square of BesselJ[0, x] ...
7
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0answers
140 views

What is a good way to code long, complex, compilable algorithms?

The functional paradigm of the Wolfram Language used in Mathematica is all around wonderful. For intense numerics, Mathematica comes with the ability to Compile ...
1
vote
2answers
63 views

How to build recursive function which only remembers every pth value and the last two values?

I need to create a recursive function of the natural numbers $f$ which only remembers the last two values it has found and every $p$th value. Below is the form of the code that I am working with, but ...
4
votes
2answers
255 views

How to compile this function

I want to compile my function that calculates the energy of a particle system. This is what I've tried: ...
5
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3answers
88 views

Problem with Compile and Flatten

I want to get two lists within a compiled function, where r is an integer: ...
4
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2answers
155 views

Improve simulation speed using Compile

I have two square matrices, a hermitian matrix h and an unitary matrix v. I am interested in the following function ...
6
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1answer
247 views

Compiling a function that takes lots of optional arguments

I have a function that takes lots of optional arguments (basically some design parameters, about 10 of them) and performs some basic algebraic calculations involving complex numbers with the options. ...
12
votes
1answer
156 views

CompiledFunctionCall vs. LibraryFunction

When compiling code to C, and the compiled code calls other compiled functions, I see CompiledFunctionCall in the output of ...
12
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1answer
436 views

Save a C compiled function without losing the blessing of C compiler

Consider the following example: ...
2
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3answers
93 views

NIntegrate-ing a compiled function

I'm trying to integrate numerically in 6 dimensions a very long expression and I read about the option to NIntegrate a compiled function which should be faster. ...
5
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2answers
113 views

A problem with Compile and Map

There is a weird behavior of Compile that I do not understand. Consider the following example: ...
2
votes
1answer
61 views

Error from Compile with a sum over two indices

I have the following code: ...
0
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0answers
68 views

Bizarre Compile Error, changing one symbol

I am trying to compile the following code: ...
1
vote
1answer
61 views

What is the meaning of the lists of numbers in the FullForm of a compiled function?

For example, f = Compile[{{x, _Real}}, x]; FullForm[f] has this output: ...
0
votes
1answer
65 views

Why does Compile redo the calculation when overflow happens?

When implementing the Numerov method solving Schrodinger equation, I encountered this problem. In order to show the order of the evaluation, Print is added. ...
0
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2answers
106 views

Numerical 3D Integration in Mathematica [closed]

My question in short is: Is it possible to make numerical 3D integration in mathematica efficiently? Or am I gonna have to move this to C++? I feel this problem is way too trivial to go to C++, so ...
8
votes
0answers
152 views

Step-by-step instruction to Install C Compiler

I remember using C compiler on my previous computers, and I never had any problems installing them. At this time, however, I failed to work through the instructions provided in Mathematica ...
5
votes
1answer
99 views

Compilation of `Total` with CompensatedSummation

I sometimes obtain an unexpected error when trying to call a compiled version of Total with compensated summation turned on. More specifically I define ...
1
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0answers
76 views

How to get Mathematica to compile with target C?

I have been trying to compile some functions in mathematica with target C for speed. basically when I try: ...
5
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1answer
196 views

Compile, “global variables” and recursion

I am trying to do something similar to this, namely to make a Compile'd function outer that itself calls a ...
0
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0answers
24 views

Returning multiple results from compiled functions in M10 [duplicate]

I have found a similar question from 2012 here. It has been 3 years now and we have version 10. Have there been any attempt to solve this problem either by Wolfram or by the community - how to return ...
3
votes
2answers
138 views

Dynamic arrays and lists with compile (Append, Linked lists etc.)

I have a code that I need to compile. The code contains a loop in which I need to gather data into a list. The question is how to best gather data so that the code works inside Compile. The following ...
0
votes
1answer
67 views

Correct use of Solve inside Compile

I have a function that behaves itself, but I want to make it much faster so I tried to put it into a compilable form After much fiddling I can't get it to work. Here's one of my failed attempts: ...
2
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1answer
51 views

Why do messages only appear first time I evaluate my compiled function?

I declare my compiled function: ...
5
votes
1answer
127 views

Slow-down encountered when using NMinimize with a compiled function

I'm minimizing a large function. Evaluating the function is very slow symbolically but using Compile I can get ~100x speed-up on this step. However, despite this, the NMinimize process is only ...
2
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0answers
58 views

Goto and Compile to C

When I use Goto inside compile and use CompilationTarget->"C" I get error message: ...
4
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1answer
137 views

Throw and Catch return wrong result inside Compile

Consider this code: fun = Compile[{{i, _Integer}}, Catch[Do[ If[j >= i, Throw[j]] , {j, 1, 10}]] ] I put an integer as argument then if this ...
1
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1answer
70 views

Throw and Catch or Return inside Compile

Consider this code: ...
3
votes
1answer
74 views

Package and imbricated compiled functions

I would like to build up a Mathematica package Pck which contains compiled functions. However when loading this library I obtain an error. When reduced to a minimal ...
5
votes
1answer
202 views

Is there any strategy to have a compiled version of FindFit or NonlinearModelFit?

Disclaimer: This is not a precise question with a definite answer. I know that neither FindFit nor NonlinearModelFit is in the ...
2
votes
1answer
193 views

Compile a MeijerG function [duplicate]

I am not very experienced with Compile, I tried to use it for a Meijer-G function ...
1
vote
0answers
49 views

Complex input for Compile makes it slow

I asked a question here and then tried to use Compile for the solution to gain even more speed. Inside Compile there is a loop ...
4
votes
1answer
126 views

A problem about CompilationTarget -> “C” [duplicate]

In my Windows 7 system, I installed two Mathematica versions (V8 and V9) In V8 Compile[ {{x}}, x^2 + Sin[x^2], CompilationTarget -> "C"] ...
1
vote
1answer
82 views

Compiling If statement

I have this code: ...
3
votes
1answer
66 views

Is it possible to change the MinPrecision in command “Compile”?

I'm using "Compile" to do some numerical calculation and I need high Precision. I was wondering if it is possible to change the Precision in command "Compile" to some $MinPrecision?
0
votes
2answers
87 views

Compile a Module wich has a loop with undetermined bound

Suppose I have such a module as below: test[int_] := Module[{m}, m = Table[i, {i, 1, 10}]; Do[m[[i]] = i*i, {i, 1, int}]; Return[m] ] The bound for ...
5
votes
1answer
107 views

Why is C-compiled (but not WVM-compiled) code so slow in Manipulate?

Here is a small section of code from this SE question which computes the real part of the dilogarithm (the upper limit of the sum is increased for demonstration purposes): ...
3
votes
1answer
185 views

How can I trans-compile Mathematica into another language?

I'm looking for an exhaustive list of source-to-source compilers to all other languages, if any exist that is.
3
votes
0answers
38 views

Escaping out of (or exiting) a Compiled Function

How do I manually escape out of a compiled function without forcing an error and compromising its speed? Here is an example: ...
1
vote
1answer
144 views

Finding the index of (x,y) pairs in a list

I have a large list of $(x,y)$ pairs, and I want to find the index of a particular pair in order to extract some data from another array. By way of an example, ...
2
votes
0answers
52 views

Compilation of a function that needs to call Subsets

I'm working on a code that runs many (easy) operations on combinations (subsets) of different size (6, 7, 8, 9) taken from a big set of numbers (normally more that 40). So, this means the code has to ...
2
votes
1answer
160 views

i cannot create a standalone executable from an exported Mathematica function

I generated the C code: compute.c ...
1
vote
1answer
99 views

Apply functions to functions yields slow execution speed

I'm trying to write a function that parametrizes a curve c(t) by its arc length. Technicly I'm finished but if I plot the result for an example curve like ...
1
vote
1answer
112 views

Use Compile to speed up evaluation

I have read, that using Compile command can speed up evaluations in mathematica. I have a mathematical expression, which I evaluate using following command: ...