contourfcmap: filled contour plot with precise colormap

Creates a filled contour plot, with more precise control over colors than contourf.

Description

This function creates a shaded contour plot, similar to that created by the contourf function. However, the relationship between a contourf plot and its colormap (i.e. exactly which color corresponds to each contour interval), can often be confusing and inconsistent, especially if your contour lines are not evenly spaced. This function instead allows the user to specify exactly which colors to use in each interval, and also to choose colors for regions that exceed the contour line limits.

• MATLAB release: MATLAB 7.10 (2010a)

[Tjaart de Wit]

Great function! Thanks

[Aurelien Queffurust]

Hi,
I wanted to test your code but:
the minmax function which is required by your code is not shipped .

Another remark:
You have forgotten a bracket in the given example in the header of M-file:
[x,y] = meshgrid(linspace(0,1,100)
should be:
[x,y] = meshgrid(linspace(0,1,100))

Now waiting for minmax.m before rating.

Thanks,

Aurélien

[Kelly Kearney]

Added minmax subfunction into main code (overlooked this dependency on a simple helper function in previous upload). Thanks, Karin and Aurelien, for pointing out that mistake.

[Earle Wilson]

great function! This saved me many hours of working around all the bugs in contourf.

The only (minor) short coming is that this function doesn't deal with saturated low values. Eg. if you enter:
contourfcmap(x,y,z,clev,cmap,lo,hi)
and there are values in z < min(clev), they will be plotted as white spaces. This is an issue with contourf really, which I won't get into here. An easy fix is set all values in z outside the clev limits to min(clev) or max(clev). Eg.
toohigh = z>max(clev); z(toohigh) = max(clev);
loolow = z<min(clev); z(toolow) = min(clev);