Practical example: Algorithm development for making colormaps

In a recent post, I mentioned LazyWeb It worked better than I expected. Matt posted some code that I requested that will highlight a line when you click on it. This works exactly as hoped. Thanks Matt, your MATLAB T-shirt has been shipped to thank you for your effort.

Ned thought this was great, so he posted a request for some code that makes colormaps.

I took up the challenge, mostly so that I could record how I went about developing an algorithm.

I broke this into two videos:

In this first video you will see:

• The colormaps that we are developing from a journal article
• The colormap applied to a MATLAB figure
• How to call the code to make the colormap
• Explaining the structure of a colormap in MATLAB
• Exploring colormaps in the colormap editor
• Plotting a colormap to understand its structure
• Creating the colormap creating subfunction
• Testing the subfunction

In this second video you will see:

• We review the colormaps that are to be made.
• Show the four expected calling syntaxes for the function
• Show how to use VARARGIN to make deal with different numbers of input arguments
• Show error catching
• Show different branches of code to be followed based on inputs
• Developing an algorithm with cell mode to test an algorithm
• Testing
• Documentation

This code was written live, so mistakes were made along the way. This gives you a realistic view of how a MATLAB expert deals with the inevitable errors that occur while programming.

The file that got created is useful on its own, so I have posted it here

Other videos have been gathered here:
https://blogs.mathworks.com/pick/category/video/

Practical example videos have been gathered here:
https://blogs.mathworks.com/pick/category/practical-example

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