fftw3 | DO NOT CHECK OUT THESE FILES FROM GITHUB UNLESS YOU KNOW | Build Tool library

by FFTW C Version: fftw-3.3.7 License: GPL-2.0

X-Ray Key Features Code Snippets Community Discussions(10)Vulnerabilities Install Support

kandi X-RAY | fftw3 Summary

fftw3 is a C library typically used in Utilities, Build Tool applications. fftw3 has no bugs, it has no vulnerabilities, it has a Strong Copyleft License and it has medium support. You can download it from GitHub.

DO NOT CHECK OUT THESE FILES FROM GITHUB UNLESS YOU KNOW WHAT YOU ARE DOING. (See below.). This is the git repository for the FFTW library for computing Fourier transforms (version 3.x), maintained by the FFTW authors. Unlike most other programs, most of the FFTW source code (in C) is generated automatically. This repository contains the generator and it does not contain the generated code. YOU WILL BE UNABLE TO COMPILE CODE FROM THIS REPOSITORY unless you have special tools and know what you are doing. In particular, do not expect things to work by simply executing configure; make or cmake. Most users should ignore this repository, and should instead download official tarballs from which contain the generated code, do not require any special tools or knowledge, and can be compiled on any system with a C compiler. Advanced users and FFTW maintainers may obtain code from github and run the generation process themselves. See README for details.

Support

Quality

Security

License

Reuse

Support

fftw3 has a medium active ecosystem.

It has 2369 star(s) with 603 fork(s). There are 157 watchers for this library.

It had no major release in the last 12 months.

There are 129 open issues and 127 have been closed. On average issues are closed in 41 days. There are 20 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of fftw3 is fftw-3.3.7

Quality

fftw3 has no bugs reported.

Security

fftw3 has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

fftw3 is licensed under the GPL-2.0 License. This license is Strong Copyleft.

Strong Copyleft licenses enforce sharing, and you can use them when creating open source projects.

Reuse

fftw3 releases are available to install and integrate.

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fftw3 Key Features

No Key Features are available at this moment for fftw3.

fftw3 Examples and Code Snippets

No Code Snippets are available at this moment for fftw3.

Community Discussions

Trending Discussions on fftw3

Openmp c++: error: collapsed loops not perfectly nested

Problem with big matrices using fftw3 in Fortran (example code)

std::fill segmentation fault error when the array is large

LNK1104 cannot open file 'libfftw3-3.lib'

Uninitialised value was created by a stack allocation Valgrind c++

Memory leak Valgrind doesn't report but code using so much memory

Can not compile FFTW3 library in vscode but same command works in mac terminal

used uninitialized value of size 8 by strcat using C++ with Valgrind while saving data

how to include Flite in C++ project with cmake?

Cmake gives me an error (pthread_create not found) while building BornAgain

QUESTION

Openmp c++: error: collapsed loops not perfectly nested

Asked 2021-Jun-02 at 07:27

I have the following serial code that I would like to make parallel. I understand when using the collapse clause for nested loops, it's important to not have code before and after the for(i) loop since is not allowed. Then how do I parallel a nested for loop with if statements like this:

...

ANSWER

Answered 2021-Jun-01 at 20:04

As pointed out in the comments by 1201ProgramAlarm, you can get rid of the error by eliminating the if branch that exists between the two loops:

Source https://stackoverflow.com/questions/67782116

QUESTION

Problem with big matrices using fftw3 in Fortran (example code)

Asked 2021-Apr-01 at 07:34

this question follows from my last question, but now with the code.

I have problems with the "Fastest Fourier Transform in the West" (link) implemented in Fortran, in particular calculating the inverse of the fft. When I test with small matrices the result is perfect, but from 8x8 on the result is wrong.

Here is my code here. I written it with comments inside. The example matrices are in the files ex1.dat,... ex5.dat, so it is easy to test (I use the intel compiler, I'm not sure that runs with gfortran). Examples ex2 and ex3 works perfect (5x5 and 7x7), but the other examples give wrong results, so I can't understand the error or where looking for.

Inside the code: to verify that all is right I calculate

...

ANSWER

Answered 2021-Apr-01 at 07:34

When you perform a forward and then a back discrete Fourier Transform on some data the normalisation of the result is conventional, usually you either get the data back as it was (to floating point accuracy), or if you are using an unnormalised transform the data will be scaled by the number of points in the data set, or you provide the normalisation as an argument. To find out which you will have read the documentation of whatever software you are using to do the transforms; fftw uses unnormalised transforms . Thus in your code you will need to preform the appropriate scaling. And if you run your code on your datasets you find the scaling is as described - on a 10x10 dataset the final data is 100 times the original data.

I cannot reproduce your claim that the code as given works for the smaller data sets. I get the expected scaling.

Source https://stackoverflow.com/questions/66892360

QUESTION

std::fill segmentation fault error when the array is large

Asked 2021-Jan-16 at 17:06

I have the following class which resembles a scalar field in two dimensions, but since periodic boundary conditions may be used, there are also ghost zones (simply view this as a 2D matrix).

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ANSWER

Answered 2021-Jan-16 at 16:59

Assuming you're running a common or typical computer, a 1e6 columns by 1e6 rows of doubles are, well

1000000 * 1000000 * 8 bytes = 8 TB (or 7.28 TiB)

So the answer is: Check the return value of fftw_malloc, which you didn't. Chances are it failed and returned a null pointer, which is surely going to cause a mess when you try to access it.

Also, check the results of the multiplication. int is most likely 4-byte and doesn't hold such a value (some 43-bit integer). Switch to size_t instead.

If you reduce the dimensions to 1e5 each, the result would be 80 GB (74.51 GiB) which may fit in large servers.

Source https://stackoverflow.com/questions/65752008

QUESTION

LNK1104 cannot open file 'libfftw3-3.lib'

Asked 2020-Dec-07 at 17:33

I am quite fresh in coding C code, trying to use FFTW from the well-known website http://www.fftw.org/ in my Visual Studio 2019. I followed the tutorial (https://www.youtube.com/watch?v=geYbCA137PU), but an error appeared: LNK1104 cannot open file 'libfftw3-3.lib' How should I solve the problem? I have googled it, but looks like most of the solution not quite suitable to mine. Almost the last step! Please!

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ANSWER

Answered 2020-Dec-07 at 17:33

@HAL9000 Thanks for your remind, I found out that I have converted the wrong name of .def so I generated a "libfftw3-3l.lib". That's why it couldn't open the file, it has been solved now!

Source https://stackoverflow.com/questions/65163098

QUESTION

Uninitialised value was created by a stack allocation Valgrind c++

Asked 2020-Nov-03 at 09:41

So, I get this error when running the command: --track-origins=yes on Valgrind

...

ANSWER

Answered 2020-Nov-03 at 09:41

This isn't a leak. You are reading uninitialized memory. As @PaulMcKenzie says in the comments, time is not standard C++, rather it is a GCC extension that comes from C99.

You could use memset to ensure that time is initialized. Alternatively, you could use std::vector, for instance

Source https://stackoverflow.com/questions/64640725

QUESTION

Memory leak Valgrind doesn't report but code using so much memory

Asked 2020-Oct-23 at 22:13

I have posted recently about a segmentation fault issue that I have been getting in my code when running with Valgrind, I have got rid of the segmentation fault problem however, now the code is running, but is "eating" so much memory which indicates a memory leak somewhere that valgrind doesn't necessarily see? I am not sure really. For example it would run to the 40th iteration before the kernel kills my process.

previous post: Segmentation Fault with Valgrind

If I run the code with the corrections to the code: (initializing my arrays and changes size of arrays to be large enough)

...

ANSWER

Answered 2020-Oct-23 at 06:03

Make sure you free() all malloc'ed memory from heap

Source https://stackoverflow.com/questions/64494608

QUESTION

Can not compile FFTW3 library in vscode but same command works in mac terminal

Asked 2020-Oct-20 at 01:08

My first test with FFTW library looks like this.

...

ANSWER

Answered 2020-Oct-20 at 01:08

Turns out I should specify my 'task.json' type as 'shell', and everything just started working.

Source https://stackoverflow.com/questions/64416320

QUESTION

used uninitialized value of size 8 by strcat using C++ with Valgrind while saving data

Asked 2020-Oct-14 at 09:43

I am aware of existence of similar posts about segmentation fault, however, I have a bit of a specific issue that I need some guidance with. I am working on a code, it's a simulation that calculates some values and saves all of these values in a document that could be used later for data analysis.

I am getting a segmentation fault error when I run the code with Valgrind in debugging mode I get the following:

"used uninitialized value of size 8":

...

ANSWER

Answered 2020-Oct-14 at 03:13

I don't think the issue has to do with "initializing"

You should think otherwise.

Source https://stackoverflow.com/questions/64346021

QUESTION

how to include Flite in C++ project with cmake?

Asked 2020-Sep-04 at 07:01

I've to use a TTS engine in my application and I tried to use Flite. I've installed it and tested it from command line just fine but when I tried to put it into my application I couldn't get it to work. I've already searched the web with no success since most instructions are either for windows or android. I'm also aware of the c++ wrapper by Barath-Kannan but it requires C++17 and at moment I can't use it. I'm using C++11 on Ubuntu 16.04.

Here is my code:

TTSFliteManager: (the class where Flite is used)

...

ANSWER

Answered 2020-Sep-04 at 07:01

This library does not come with a pkg-config file or CMake support, but it does use the regular autotools installation structure (PREFIX/include, PREFIX/lib).

That means you can tell CMake to search for it:

Source https://stackoverflow.com/questions/63704768

QUESTION

Cmake gives me an error (pthread_create not found) while building BornAgain

Asked 2020-Aug-14 at 15:25

I am trying to build the BornAgain software on my computer running the latest version of Fedora 32. I managed to do it before, but I do not even know where to start with the error that I'm getting. In my Terminal I get the following error:

...

ANSWER

Answered 2020-Aug-14 at 15:25

Thank you Eelke! I cannot believe that I actually spend half of my working day on this, given the amount of Ǵoogle hits on Cerf_LIBRARIES, I assumed this was a specific thing from the software I tried to install.

Given you formated Cerf seperately, I googled that and I quickly found I could install libcerf and libcerf-devel directly from the dnf package manager. That immediately solved my entire issue. Thank you for solving this headache, I kinda feel stupid for not finding this earlier.

Source https://stackoverflow.com/questions/63411559

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

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