| T O P I C R E V I E W |
| proxquad |
Posted - 04/20/2018 : 10:32:17 AM
Hello,
i do a lab course and i am trying to find a way to express the fluctuations of a surface in Amplitude against frequency.
For that i am going to use a Fourier transformation.
I have measurement values in a 3D- way such that for some x and y is a z value. This z value is changing along x axis and along y axis.
My ascii looks like this
x x x x x ....
y z z z z z ....
y z z z z z ....
y z z z z z ....
. . . . . . ....
. . . . . . ....
. . . . . . ....
(i) Is there a way to Fourier transform this?
(ii) Is there a way to detect all frequency changes in x and y and not only along a particular axis? |
| 1 L A T E S T R E P L I E S (Newest First) |
| Hideo Fujii |
Posted - 04/20/2018 : 5:43:25 PM
Hi proxquad,
Such data organization (stored in a worksheet) is called a "virtual matrix" in Origin.
You can convert it to a regular matrix by selecting "Worksheet> Convert to Matrix>
Direct" menu, and set the options like:
- Data Format = X (or Y) Across Columns
- X (or Y) Values in = First Data Row (or Column Label)
- Y Values in First Column = YES
Once your data is converted to a matrix, you can run the 2D FFT by choosing:
"Analysis> Signal Processing> FFT> 2D FFT" menu (in OriginPro).
I hope this helps.
--Hideo Fujii
OriginLab
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