Color Specific Points in a Meshgrid Matrix

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Greg B.
Greg B. 2015-10-21
I am trying to color specific points/coordinates created in a meshgrid matrix, created below:
[LAT LON] = meshgrid(lat,lon);
a=LAT';
b=LON';
plot(a, b, 'o','MarkerEdgeColor','k','MarkerFaceColor','k');
axis([-18 18 -18 18]);
hold on
What I have so far plots all points black. The meshgrid creates a 51X51 matrix. How do I go about coloring all points in the plot red if b= 10th row, for example?
Thanks.

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