Question

I am trying to plot a dataset using imagesc in Matlab.
The dataset is structured like this:

x1  y1  value1
x2  y2  value2
x3  y3  value3
...

The problem:
when I try to plot it like this:

imagesc(x,y,value) 

the figure is only in one dimension.

It works well when I plot it with plot3, using the values for the z-axis.

How can I visualize this dataset using imagesc?

Answer 1

imagesc needs a matrix structure rather than the 3 vector you mentioned, and assumes that the data is used in uniform space grids. So I’d use scatter instead to begin with. A way to still use imagesc is to interpolate to an uniform grid and construct a matrix out of the 3 vectors you have: