Help with contour plot

Hello! I have a 'contour' plot like the one in the figure.

As you can see, there is a lot of white space, and only a discrete set of colors in my figure, although the bar on the right shows a continuum range of color shades. Is there a way to see a plot able to show a more detailed chromatic scale? Maybe I need to increase the number of contours, but I don't know how. The only lines in my code are the following:

    figure
    contourf(x,y,M)
    colormap(b2r(-0.15,0.25))
    colorbar

Thanks for the help

Answer 1

[Kelly Kearney]

You can increase the number of contours using a fourth input, specifying either the number of lines or the values

contourf(x,y,M,50); % 50 contour lines
contourf(x,y,M, [-0.15:0.05:0.2]);

The latter option is better if you want uneven spacing of contours, for example higher resolution of lines near 0.

You might also be interested in this function: contourfcmap, which allows you to specify exactly which color you want to use for each interval.

[aurc89]

Thanks!