How do I draw colored graph?

I have a 6×37 matrix of locations in Kilometers, X and Y.

I want to draw a graph with Coc as the color.

I used the code:

figure;

pcolor(X,Y,mean(Coc.*1e3));shading flat
      caxis([0 1e-35]); 
      xlabel('x (kilometres)');
      ylabel('y (kilometres)');
      h=colorbar;
      ylabel(h,'\mu g m^{-3}');

I didn't get any color.

[KSSV]

Your X, Y are not forming a meshgrid....you can just try:

pcolor(Coc) ;
shading interp ;

[Aduloju Oluwatobi]

It's not what I want.

Answer 1

[Steven Lord]

This smells fishy to me.

caxis([0 1e-35]); 

From the documentation page: "caxis(limits) sets the colormap limits for the current axes. limits is a two-element vector of the form [cmin cmax]. All values in the colormap indexing array that are less than or equal to cmin map to the first row in the colormap. All values that are greater than or equal to cmax map to the last row in the colormap. All values between cmin and cmax map linearly to the intermediate rows of the colormap."

The minimum value in your Coc array is about 1.5e-16. The mean of that array cannot be less than that value, and that means all of those values are going to get mapped to the last row in the colormap.

I recommend changing your color axis limits.

[Aduloju Oluwatobi]

I already changed it to be between 0 and 1, I still get the same result