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

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Discussion Overview

The discussion revolves around creating a dataset that follows a specific curve, with an emphasis on generating a second dataset with lower volume and added noise. Participants explore methods for data generation, manipulation, and the challenges faced in achieving the desired output.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested, Homework-related

Main Points Raised

  • One participant seeks guidance on how to create a dataset that mimics a specific curve, mentioning the need for a second dataset with noise.
  • Another participant suggests that the curve resembles a 1/x relationship.
  • A participant expresses uncertainty about efficiently generating data that approaches the desired trend.
  • One participant discusses attempting to use the inverse fast Fourier transform (ifft) in Excel, expressing frustration over manipulating the output without programming and questioning if it's a dead end.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best method for creating the dataset, and multiple competing approaches and uncertainties remain in the discussion.

Contextual Notes

There are limitations regarding the efficiency of data generation methods, the manipulation of Fourier transform outputs, and the lack of programming solutions discussed.

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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