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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:

Practical example videos have been gathered here:

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