35 Comments

  1. Author

    I need to look deeper into this. It might just be some arbitrary scaling.

  2. Hello, George. Why do we divide the “cos” and “sin” totals by 20000?

  3. Hi, George;
    It is very good one, I love it. I am learning how to use it properly. I plug in my own data points and time blocks such that I copy and paste my data points under Custom 4, and time blocks at Column 3, changed stop frequency to 10000, then choose Function #4 and run, I do not get an appropriate fourier transform. My data points is 2000 and time increase is 0.005. what should I do in order to make it work with any my own data points?
    Thanks,

  4. I want to build an inverse as well as a DFT both direct and inverse. I’ve been too busy lately with insurance claims and a contract I need to finish.

  5. I have since discovered that having a second spread sheet opened slows the process. Once I close the second spreadsheet performance picks up considerably and it becomes very usable.

    Its very nice. Ever considered an “inverse transform” option ?

  6. Thanks. What was the largest data points you used besides the demo version?

  7. Yes that’s easy to do, except it’s going to be slow. I chose the limits you see there for speed reasons.

  8. Hi George, Any thoughts? If considering speed, what would be a realistic data point limit? Thanks.

  9. 10X of the current limit.

  10. How many points you need?

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