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I never used Fourier in MMA before, so I am going to do it in a rather primitive way. First I am going to extract the coordinate from the image. For that I will resize and scale the image to make the number of data less as possible. img = Import["http://i.stack.imgur.com/gxyMR.jpg"]; img1 = img // Binarize dat = Sort@Union@PixelValuePositions[img1, ...


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Upload your data to http://pastebin.com/ to show you the exact frequency spectrum. Here is a simple code which reads your data from a ascii file (2 columns time and mx) and creates 2 plots, one showing the liner amplitude versus frequency and the other one showing the logarithmic amplitude versus frequency. dir = "F:"; (* the output directory for the ...



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