Questions tagged [compile]
Questions about the generation and use of compiled functions using Compile.
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How to produce the following table faster?
Consider two data files, acc.m and distr.dat. They contain some functions that I need to multiply to obtain function ...
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Compiling a function that uses MapThread
I'm looking for tips on quickly applying the following update to $B$ pairs of $(w_i,x_i)$
$$\text{step}(w_i,x_i)=w_i-a x_i \langle w_i, x_i \rangle$$
Below is a readable but very slow version ...
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Argument value loss using Listable C-Compiled Function
In my recent studies, I have come across a very strange anomaly with C compiled functions. When I call a function that has the 'Listable' attribute while global variables are accessed through ...
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Can I efficiently use a compiled function as an input to another compiled function?
I have a compiled function(such as $f\left(z,c\right)=z^2+c$) which will get replaced by different equations as the code runs. I'm using this compiled function(#1) inside another compiled function(#2)....
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How to speedup calling the interpolation function? [duplicate]
Consider the following data:
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How to generate points belonging to some region very fast?
Consider two variables Ex,th. th ranges within
thmin=10^-5;
thmax=Pi/2;
while ...
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Compile a code evaluating a condition only if another condition is positive
Consider the following three tables:
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How to assign a new value to the table inside Compile?
Consider some tables and function func:
phivals=RandomReal[{-Pi,Pi},10^5];
func[phi_]=phi^5*Exp[-phi];
acc=Table[0,10^5];
I ...
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Why the ugly code is faster than the pretty code?
The task
Consider two tables, Tab1,Tab2, that include some real-number data. I need to evaluate the product of some boolean conditions on the value of some function ...
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Trying to speed up finding solutions of quadratic form related to the weight of a matrix
Say I have an integer matrix of size $5 \times 5$ - I am trying to find the solutions to the equation $n^4 wtM = n w^2 + x1^2 + x2^2 +x3^2 +x4^2 + x5^2$ subject to the constraints $x1+x2+x3+x4+x5 = 0$ ...
CommunityBot
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Compile code involving two matrix multiplications
Consider the following simple matrix operation ($a_j, b_j, z, w$ are matrices)
$$ w=\sum_j a_j\cdot z\cdot b_j$$
For performance reasons I am compiling the code
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Compile integer functions
I need to speed up a function that uses Binomial and QuotientRemainder. I used Compile, but ...
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SymbolicGPU documentation
I found an interesting files there
$CUDALinkPath -> ../GPUTools
here
...
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Can NumericArray be Compiled?
I've have a big block of code written under Compile. Some other part of the code which receives data from shared Q useing ...
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How to use FunctionCompile and Compile as external definition?
Let's consider the following functions (in $Version: 12.3.0 for Linux x86 (64-bit) (May 10, 2021))
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Why CompilationTarget->"C" doesn't improve computation time
I wrote a simple code to test the computation time under CompilationTarget->"C". I get barely any improvement on the computation time from ...
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How can I set up Compile[] correctly on my Windows 11? I keep on getting an error that I have no compilers installed (but I do)
I'm trying to use Mathematica's Compile[] function to speed up some of my computations:
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(Too) Slow Compiled Function To Sum Waves
I have some code that sums planar waves and outputs a graphical result, as per the mock up below :
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Speed up calculation of recursively defined list
I have two lists $a$ and $b$ of length $n$ and $n-1$ respectively (typically I have $n \approx 1000$).
I have to compute a list $\theta$ of length $n$ which is defined recursively by the following ...
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Why association slows down compiled function in the following example?
Consider the following code, which generates some data and performs some selections:
...
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Warning from CompiledFunction is permanently off silently after generating for 3 times, bug or feature?
I've been vaguely aware of this behavior for a long time but never looked into it. Consider this sample:
...
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How to speedup comparison in the following example?
I have the following problem: I would like to generate random values of some variable $z$ obeying some distribution, but simultaneously within the interval zmin<...
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Speed up summation of many inverse matrices
Physical background
I am trying to write a code that computes the Green function of a system, given the Self energy $\hat{\Sigma}_n$, a list of Matsubara frequencies $z_n$ ($n=1,...,N_{Mats}$) and the ...
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Error thrown by compiled expression
The following code is a minimal model of an error I am getting. It returns the error Compiled expression {{0,2},{2,0}} should be a machine-size real number. and <...
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3D stable fluids algorithm based on FFT
This code is 3D extension of the code from my answer here. As well known the stably fluids algorithm is some kind of predictor corrector algorithm - see my answer here. This algorithm includes 3 steps ...
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How to use global variables in FunctionCompile?
In FunctionCompile, system does not recognize external functions and external global variables by default. But we can use ...
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Set return type in compilation of a function of list
I hope to compile a complicated function with the process that create an complex list and sum over it. However, system always tell me the output should be a real number and I cannot change them. How ...
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Using Compile with vector expressions
Consider a vector
vec[x_,y_,z_]={x^0.5*y^0.1,y^0.3*z^0.1,z^2*x*y};
I need to calculate, say, a table with vector values for the coordinates
...
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Speed up counting of digits in binary number
I am writing a large numerical code where I care a lot about performance, so I am trying to write compiled functions that are as fast as possible.
I need to write a function that does the following. ...
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Fast value extraction for refreshing large data
I am trying to fine tune a procedure to reduce its running time. It involves two large arrays "data" and "positions":
...
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Replacing symbolic variables inside of a compile
As the result of a symbolic integration, I have a very long array with symbolic variables u[i] which I would like to substitute for real number values. Moreover, I ...
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Speed up functions using variable types but not Compile
I am writing a large numerical code and I have set up many functions that take several arguments as input. In the functions I am using several built in Mathematica functions, such as Sum[], Part[], ...
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Getting symbolic form of `RotationMatrix`
Calling Compile seems to run into trouble compiling RotationMatrix, I'm guessing because it has type restriction to return ...
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Compile error in recursive code due to large integer
I am trying to implement a compiled version for the original algorithm that is supposed to run faster . It works fine for small iteration loop number when max=100. However, when loop number gets ...
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How can CompiledCodeFunctions be optimized and parallelized?
Fast generation of random variates as test case
The earlier question (195435) about performance tuning with regard to fast generation of random variates for a gamma distribution has stirred my ...
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How to use CompilerOptions?
The refpage for FunctionCompile's option CompilerOptions is empty of examples:
Does anyone know what keys and values can be ...
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What do the Compile options" RuntimeAttributes -> {Listable}, Parallelization -> True" mean?
I am confused about what Compile's Listable and Parallelization options do.
(edit: This post is relevant: stack exchange "The option parallelization for compile")
My initial assumption was ...
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Multi-NIntegral with a compiled function: Why not improved so much?
I want to compute the multi-dimensional integral by using NIntegral with the compiled function.
I have compiled an integrand function.
It made the computation time of the integrand about 100 times ...
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How to programmatically construct a function or a compiled function?
I'd like to programmatically construct a function from a long expression with many duplicate terms. The objective is to programmatically create a set of compiled functions with expressions that were ...
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How to compile a matrix with mixed values?
Consider some matrix
matrix = {{a,,...,b,...},...},
where a,b are some strings (like "Name"), ... inside the row corresponds to numbers, and ... are ...
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Help understanding a bug when FoldList using RandomChoice is Compiled
Bug introduced in 3.0, persisting through 13.1.
Preamble: I submitted this bug to support@wolfram.com and it was acknowledged. I assume it will be fixed eventually. In the meantime I'd like to ...
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FunctionCompiling lists of things
I have a compiled function that works on a list of some atomic type e.g. strings, but also want it to work on lists of others (e.g. integers, reals, symbols, etc).
Moreover, nothing in the code has to ...
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How to convert the ListVector into PackedArray in FunctionCompile
Cross post here
I have a compile function cf to calculate the mean for a ragged list:
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Using a compiled function in NMinimize
I can get NMinimize to work with compiled functions in simple cases.
This works with a constraint:
...
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OptionValue not inserting correct option
I am using OptionsPattern and OptionValue to define some switches for my custom function. Here is a minimal example:
...
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Implementing fast linear search for perfect vertical image alignment
After experimenting with image alignment aprroaches presented here and here and some other approaches involving ImageDistance and ...
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