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huah2002
1 Posts |
 Posted - 09/17/2022 : 08:10:40 AM
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Hi,
I want to use the fft_amp function to analyze an oscillating signal. I am using Origin 2022 (64-bit) SR1.
I have tested the example in https://www.originlab.com/doc/en/OriginC/ref/fft_amp . I have compiled the code after typing 'Run.LoadOC("Originlab\fft_utils.c", 16)' in the command window. However, the Ampilitude column remains blank after I execute the fft_amp_ex2() function.
I would like to ask for some advice.
Thank you.
Here is the code from https://www.originlab.com/doc/en/OriginC/ref/fft_amp.
//Before running this example, import \\Samples\Signal Processing\fftfilter1.DAT to worksheet
#include <fft_utils.h>
void fft_amp_ex2()
{
Worksheet wks = Project.ActiveLayer();
if( wks )
{
Column colX(wks, 0);
Column colY(wks, 1);
if( colX && colY )
{
XYRange rng;
rng.Add(wks, 0, "X");
rng.Add(wks, 1, "Y");
vector vX, vY;
rng.GetData(vY, vX);
int nSize = vX.GetSize();
// prepare frequcy and amilitide columns
Column colFreq(wks, wks.AddCol());
colFreq.SetLongName("Frequency");
Column colAmp(wks, wks.AddCol());
colAmp.SetLongName("Ampilitude");
vector& vFreq = colFreq.GetDataObject();
vector& vAmp = colAmp.GetDataObject();
// to calculate frequcy and ampilitude
fft_amp(vX, vY, vFreq, vAmp, nSize);
// plot
GraphPage gp;
gp.Create("origin");
GraphLayer gl = gp.Layers(0);
Curve cv(wks, colFreq.GetIndex(), colAmp.GetIndex());
gl.AddPlot(cv);
gl.Rescale();
}
}
}
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Edited by - huah2002 on 09/17/2022 08:35:48 AM |
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minimax
351 Posts |
Posted - 10/09/2022 : 03:40:44 AM
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Hi huah2002,
It is indeed a bug and we will get it fixed in the upcoming version, Origin 2023. (internal issue record is ORG-25788) |
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Problem with the fft_amp function