MATLAB: Colorbar not matching colormap

Question

I want to do a scatter plot with points in different colors in the following way (Using Matlab 2018b).

colormap = jet(256);
v = rescale(pwdb, 1, 256); 
numValues = length(pwdb);
markerColors = zeros(numValues, 3);
figure
for k = 1 : numValues
    row = round(v(k));
    markerColors(k, :) = colormap(row, :);
end
scatter(location(1,:), location(2,:), [], markerColors,'filled');

This works fine, the points are plotted with the right colors.

However, when I try to add the colorbar (with ), I get the following:

colorbar

What is the way to include the color red in the bar and the right values?

Thanks

Answer 1

colormap is a function and you just blew it away with this line of code:

colormap = jet(256);

That overwrote the colormap function (luckily not permanently) with a 256-by-3 double array.

Try it this way

colormap(jet(256));