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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Anti-Spam Code: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by huah2002[/i] [br]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(); } } } [/quote]   Check here to include your profile signature. Check here to subscribe to this topic.