fftw Questions
3
Solved
I am compiling a test program to test the fftw3 (ver3.3.4). Since it is not installed with root previlidge the command I used is:
gcc -lm -L/home/my_name/opt/fftw-3.3.4/lib/ -I/home/my_name/opt/ff...
Cown asked 29/8, 2014 at 12:10
2
Solved
I have C++ code which uses FFTW 3.3.4. Ubuntu 16.04, cmake version 3.7.2
$ locate *fftw*.so
/usr/lib/libsfftw.so
/usr/lib/libsfftw_mpi.so
/usr/lib/libsfftw_threads.so
/usr/lib/libsrfftw.so
/usr/l...
1
Solved
I am trying to solve the 1D heat equation using a complex to complex IDFT. The problem is that the output after a single timestep does not seem to be correct. I have included a simple example below...
3
Solved
I am trying to FFT an image using the library from http://www.fftw.org/ so that I can do a convolution in the frequency domain. But I can't figure out how to make it work.
To understand how to do t...
Paperback asked 17/10, 2011 at 7:59
2
Solved
Can I expect a speedup when using FFTW (http://www.fftw.org/) instead of OpenCV's cvDFT (http://goo.gl/YCHj0)?
My program's runtime is heavily determined by the application of inverse and forward ...
3
Solved
I wish to call fftw's in-place real-to-complex transform function, which has the following signature:
fftw_plan fftw_plan_dft_r2c_1d(
int n, // transform length
double* in, // pointer to input a...
Etheline asked 1/9, 2019 at 21:42
1
I have a program that I am trying to run in the Visual Studio Code debugger that uses fftw functions. It compiles with the command
g++ dimer.cpp -std=c++11 -lfftw3
on the terminal on my computer ...
Corot asked 23/7, 2019 at 22:42
1
Solved
I'm trying to visualize a signal and its frequency spectrum in Julia.
I found the FFTW package that provides the FFT and DSP for the frequencies.
Here is what I'm trying, with a sinusoidal signal...
1
Solved
I have been fighting with a very weird bug for almost a month. Asking you guys is my last hope. I wrote a program in C that integrates the 2d Cahn–Hilliard equation using the Implicit Euler (IE) sc...
2
Solved
I am trying to write a FORTRAN code to evaluate the fast Fourier transform of the Gaussian function f(r)=exp(-(r^2)) using FFTW3 library. As everyone knows, the Fourier transform of the Gaussian fu...
1
Solved
I am learning how to handle the FFTW package with fortran. To produce an easily verifiable example, I compute the power spectrum of a 2d plane, which I fill with two distinct superpositioned waves....
1
Solved
I am trying to use Eigen unsupported FFT library using FFTW backend. Specifically I am want to do a 2D FFT. Here's my code :
void fft2(Eigen::MatrixXf * matIn,Eigen::MatrixXcf * matOut)
{
const i...
Gawlas asked 5/4, 2018 at 16:5
1
Solved
I have written a C program that uses FFTW to compute derivative (repeatedly) of a function. I am testing for simple sin(x) function. Each step computes the derivative of the answer of the previous ...
2
Solved
I'm using Windows 10 and Visual Studio 2015. In C++, I need to get the Fourier-transform of an image for applying filters on it. It seems that FFTW++ is the ideal solution for this, however I can't...
Inflatable asked 24/9, 2016 at 10:41
6
Solved
I take blocks of incoming data and pass them through fftw to get some spectral information. Everything seems to be working, however I think I'm getting some aliasing issues.
I've been trying to wo...
Sevenfold asked 24/8, 2010 at 9:59
1
I'm trying to find the oscillation and spectrum frequency of the waveform generated by a vector of data representing the motion of a pixel in an image.
The data is stored in a .txt file, as follow...
Succor asked 25/4, 2017 at 14:57
2
Solved
I am trying to run FFTW code in a mex file. This is strictly for the purpose of development and testing. After some googling, I see that others have tried to do something similar and have had relat...
3
Solved
Suppose that I have a sequence x(n) which is K * N long and that only the first N elements are different from zero. I'm assuming that N << K, say, for example, N = 10 and K = 100000. I want t...
4
Solved
I am trying to compute the FFT and then the IFFT just to try out if I can get the same signal back but I am not really sure how to accomplish it. This is how I do the FFT:
plan = fftw_plan_r2r_1d...
Consistence asked 16/4, 2011 at 10:2
1
Solved
I'm compiling octave on my LFS - Linux from scratch - system.
While configuring octave, I receive a warning:
configure: WARNING: FFTW3F library not found. The slower FFTPACK library will be used i...
2
I want to analyze a signal I get from my microphone port by using portaudio and fftwpp. For that I followed the explanation provided here. My questions concerning that are now:
There it is stated t...
1
Solved
I'm having the following issue in my attempt to use fftw3. For some reason, whenever I do an FFT using FFTW_MEASURE instead of FFTW_ESTIMATE, I get blank output. Ultimately I'm trying to implement ...
2
Solved
Edit: I resolved this issue, the solution is below.
I am building a code in a shared computing cluster dedicated for scientific computing, thus I can only control files in my home folder. Although...
Form asked 4/11, 2015 at 10:37
1
Solved
I have a matrix stored in row-major order. I am trying to compute the DCT of a ub-matrix using FFTW, and I get nonsense. In the following paragraphs I will describe the problem and my solution, and...
6
Solved
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