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plot 2D matrix data

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I have a numeric matrix array, with column 1 containing the x coordinate, column 2 containing the y coordinate, and column 3 containing the value at that xy position. How can I create a reliable 2d pcolor plot from this matrix?

Accepted Answer

Star Strider
Star Strider on 4 Aug 2021
The pcolor function requires a matrix argument, and the data provided here are a (5000 x 3) matrix with ‘X’, ‘Y’ and ‘Z’ columns. Creating a matrix from this is necessary if you want to use image, pcolor, or other such functions.
I would skip that and just use scatter3 and then rotate it using the view function:
LD = load('data.mat');
data25um = LD.data25um;
figure
scatter3(data25um(:,1), data25um(:,2), data25um(:,3), [], data25um(:,3), 's', 'filled')
grid on
xlabel('X')
ylabel('Y')
view(0,90)
axis('tight')
producing:
.
.

More Answers (1)

darova
darova on 2 Aug 2021
Use griddata to create matrices
  1 Comment
Sam Hurrell
Sam Hurrell on 4 Aug 2021
How can I use griddata for the data in its current form? The examples I've looked at seem to give values based on defined calculations rather from a data array?

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