Plot data from a txt in a meshgrid

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marco97f
marco97f 2022-12-5
回答： Gokul Nath S J 2022-12-9
Hi,
I have a .txt file with a single column of 10000 values, and I'd like to display these values as z-values in a x-y mesh grid made by 100x100 nodes. How can I arrange the values in a sort of 100x100 matrix and plot the surface made by z-values.
Thanks a lot!
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Mathieu NOE
Mathieu NOE 2022-12-5
hello
use readmatrix to load the data from the txt file
then use reshape to convert your vector of 10,000 values to an 2D array of size 100 x 100 (pay attention how you want the data be reorganized in row or column directions)
then you can plot using one the many available functions of 3D plotting (surf, imagesc, plot3,...)

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Gokul Nath S J
Gokul Nath S J 2022-12-9
Hi Marco,
Please find an example code using the surf command.
data = readmatrix(‘file.txt’);
data2d = reshape(data, 100, 100);
[X,Y] = meshgrid(1:100,1:100);
surf(X,Y,data2d);
You can replace file.txt with your text file.
Refer the following article for more information.
https://in.mathworks.com/help/matlab/ref/readmatrix.html
https://in.mathworks.com/help/matlab/ref/surf.html

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