fftw | Statically-linked Go wrappers for FFTW | Code Analyzer library

I have C++ files in my iOS Xcode project. Those files uses the next libraries that I'm calling via HomeBrew:

• mpg123/1.26.5
• libgcrypt
• ffmpeg
• libgpg-error
• fftw
• libsndfile

The way I'm including them in the project is by setting the HeaderSearch Paths:

And the Library Search Paths:

That is all I'm doing to call those libraries. The error that I'm getting when I compile the project is the next one:

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

I have a time-series, which essentially amounts to some instrument recording the current time whenever it makes a "detection". The sampling rate is therefore not in constant time, however we can treat it as such by "re-sampling", relying on the fact that the detections are made reliably and we can simply insert 0's to "fill in" the gaps. This will be important later...

The instrument should detect the "signals" sent by another, nearby instrument. This second instrument emits a signal at some unknown period, T (e.g. 1 signal per second), with a "jitter" likely on the order of a few tenths of a percent of the period.

My goal is to determine this period (or frequency, if you like) using only the timestamps recorded by the "detecting" instrument. Unfortunately, however, the detector is flooded with noise, and a significant amount (I estimate 97-98%) of "detections" (and therefore "points" in the time-series) are due to noise. Therefore, extracting the period will require more careful analysis.

My first thought was to simply feed the time series into an FFT algorithm (I'm using FFTW/DHT), however this wasn't particularly enlightening. I've also tried my own (admittedly rather crude) algorithm, which simply computed a cross-correlation of the series with "clean" series of increasing period. I didn't get very far with this, either, and there are quite a handful of details to consider (phase, etc).

It occurs to me that something like this must've been done before, and surely there's a "nice" way to accomplish it.

I am trying to execute a simple FFT using FFTW 3.3.5 over the cluster.

When I run a specific ImageMagick convert command (to produce an animated GIF) inside a Singularity container it is consistently giving an memory error:

This is what I assume to know: When printing the variable "i" in the console, the command "std::cout << i" is usually used. If "i" refers to a pointer, I do "std::cout << *i". So far so good.

But in the (classical CUDA FFT) C++ example below, this doesn't work and I don't know why. Here's the code snippet (I don't want to post the entire code for clarity):

This question may seem stupid, but as a beginner I did encounter this question when I moved forward, and I couldn’t find any information.

https://upload.cc/i1/2020/12/30/rUEC9s.png

https://upload.cc/i1/2020/12/30/d7Gwbr.png

https://upload.cc/i1/2020/12/30/6vr3lQ.png

This is an open source C++ program, I tried to compile and run it, but it failed

I have the following confusion:

1. Why the program does not have main.cpp

Update: When asking the first question, I even forgot helloworld.cpp, sorry

1. How do I compile and run it with CLion

Update: Usually I create a new project. After I create the project, it seems that it can be compiled and run for granted, but I don’t know how to compile and run an existing project (from others).

1. What do the folders in the first picture usually refer to

2. What does cmake and CMakeList.txt mean?

3. This open source program calls opencv, fftw and other libraries. I downloaded the corresponding files on the official website. How should the program call these libraries next? If I download the library package on the official website, how should I install or configure it; if I install the package using homebrew, does that mean I have already configured it? Or I just finished downloading

I have written some programs in c++ and qt, but I don’t seem to know anything about c++

Finally, there is really nothing in the readme of this project

I need to calculate the Hilbert transform and get its absolute number from my signal. I installed the FFTW and followed these YouTube tutorials, both worked good.

However, I implemented the Hilbert Transform as the video did, I didn't obtain the value as same as Matlab calculated.

I've read some of the people who solved this problem by just using the FFT and doing other calculations, but they didn't give the answer clear enough. Could anyone provide me several lines of code which based on the FFTW so that can let result become same to Matlab calculated result?

Here is the Hilbert transform code which I followed the video:

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!