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

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85 views

Numeric error in trivial compilation

I came across this strange problem: dd = Compile[{}, Abs[(10^-200 + 10^-200 I)/(10^-200 + I 10^-200)]^2, CompilationTarget -> "C"] dd[] ...
1
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1answer
50 views

Module inside module in `Compile`

How can I make compilation to go through with a module inside module? I tried this, failed, a few other ways failed too. ...
0
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0answers
57 views

Is tensor argument passing to module expensive?

I wrote a simple module which is supposed to do recursive computation, however it turns out to be expensive even for 300 points. I am not sure why is it slow, all the computations seem to be ...
9
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0answers
111 views

Memory usage of compiled function: C vs WVM

Why does generating an array in "C"-compiled function uses 50% more memory than doing same thing in "WVM"-compiled function? ...
2
votes
1answer
95 views

How to solve coupled complex-valued equations faster and get simplified solution

I have six coupled equations. How to solve these equations symbolically faster in Mathematica. In these equations, variables p,q,x,y are ...
1
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0answers
52 views

Compile a listable function to be applied over list of lists [closed]

Consider a simple function g[x_,y_,z_] := x + y + z; (indeed, any multivariate function g will illustrate the same thing). ...
15
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1answer
536 views

Use Compile to improve performance

I've recently discovered Compile as a way to optimize my code. I wrote a program to learn something new about Compile. I have a ...
3
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1answer
71 views

How to use Compile to generate an $n×n$ array using $n$ tensors with both Real and Integer element

This is an extension of my earlier questions Faster use of Condition for a large array (see the example) and How to use Compile to generate an $n\times n$ array using $n$ vectors . In this case each ...
18
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0answers
151 views

Listable compiled function crashes the kernel with “no more memory available”

Bug introduced in 9.0.0 and persisting through 10.2.0 I am trying to speed up a function that involves continued fractions. Since ContinuedFraction cannot be ...
4
votes
1answer
79 views

Undeclared Identifier error in Compile

I've been trying to compile a couple of functions in Mathematica, and I keep coming across an error that I do not know how to resolve. Consider the following function: ...
2
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1answer
44 views

Using Compiled Function in Implicit Region

I am looking for a way to speed up code and thus would like to use a compiled function in an ImplicitRegion. Here is an example of a region that can be plotted ...
4
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0answers
120 views

CompilationTarget to C takes long compilation time

Consider I have a function, with one version that compiled to the virtual machine and one that compiled to C: ...
7
votes
1answer
99 views

How to compile procedural program effectively

Consider these four function in different form: ...
2
votes
1answer
103 views

How to use Compile to generate an $n\times n$ array using $n$ vectors

Let's consider the following: ...
1
vote
1answer
134 views

How to speed up an optimization with very long symbolic expressions?

I have 8 very long symbolic expressions (each having around 200,000 summands) - Simplify will run forever, so that is unfortunately not an option. Each of those ...
3
votes
1answer
65 views

Use a part specification as the argument to a compiled function

I have some code that needs to generate a large matrix based on some complicated combinations of smaller matrix elements. I find that if I write a function for the element of the larger matrix, and ...
2
votes
1answer
96 views

CCompile Problems

Operating System: Windows 8.1 Mathematica: 8 In possession of: Visual Studio 2013 and 2015 Had to alter the visual studios driver file within CCompilerDriver application, add-on so that it found the ...
0
votes
0answers
48 views

Compilable function with the functionality of SingularValueList

I'm doing something that involves finding the singular values of a lot of matrices. Basically I need to find singular values of $n$ matrices of dimension $n\times n$, where $n$ is as large as ...
3
votes
0answers
72 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: ...
12
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1answer
483 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 ...
1
vote
0answers
121 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
votes
0answers
82 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
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0answers
78 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
votes
0answers
148 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
66 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
262 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
92 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
161 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
261 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
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1answer
169 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
454 views

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

Consider the following example: ...
2
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3answers
121 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
votes
2answers
116 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
68 views

Error from Compile with a sum over two indices

I have the following code: ...
0
votes
0answers
70 views

Bizarre Compile Error, changing one symbol

I am trying to compile the following code: ...
1
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1answer
62 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
votes
2answers
121 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
196 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
103 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 ...
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0answers
99 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
votes
1answer
201 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
27 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
157 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
68 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
votes
1answer
53 views

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

I declare my compiled function: ...
5
votes
1answer
148 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
votes
0answers
66 views

Goto and Compile to C

When I use Goto inside compile and use CompilationTarget->"C" I get error message: ...
4
votes
1answer
143 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
vote
1answer
74 views

Throw and Catch or Return inside Compile

Consider this code: ...