How can I create a dataset with a specific curve and add noise to it?

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To create a dataset with a specific curve and added noise, the user seeks to replicate a trend resembling a 1/x relationship. They express difficulty in efficiently generating data that matches this curve, particularly when trying to manipulate outputs from the inverse fast Fourier transform (IFFT) in Excel. The user attempts to adjust amplitudes to create a step function but finds that this approach disrupts the fast Fourier transform (FFT). They inquire about possible methods to achieve their goal without programming, questioning whether their current approach is a dead end. The discussion highlights the challenges of data manipulation in Excel for curve fitting and noise addition.
clemon!!
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see the follwing print out - you can imagine what the trend might be - the dataset i want to make??

how can i create that data. i mean that sort of curve twice - the second time of a lower volume with noise added. make sense?http://imageshack.us/f/703/40382180.png
sorry for some reason i can't embed.thanks! precision is unimportant atm. if i knew how to joing peaks i could do it easy...
 
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Looks a lot like a 1/x relationship.
 
yup. i started a new thread now in analysis section if you want to help :)Luke
 
oh i can create data approaching the trend... i don't know how to do so efficiently yet tho ha.
 
i was trying to run ifft on excel but i then want to manipulate the output [basically - everything above the median amp = 1, everything below = -1. turning into steps]... but this destroys the fft - completely. is there no way around that - i was thinking of using solver and ifft in excel together but that's impossible. so can i do so without programming, and anyway, is this just a completel dead end?
 

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