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August 20th, 2008

Advanced MATLAB: Dynamic field names

We have MATLAB users come into The MathWorks to present their work in MATLAB from time to time. Recently there was an interesting presentation with some really great “Clutter classification” algorithms in a GUI. One of the questions that came out of that discussion was how to get rid of a bunch of EVAL statements from their code. The following code shows how they can be avoided using “dot parens notation”, or Dynamic Field Names as they are formally known.

a.doug = ‘Hull’
a.jiro = ‘Doke’

name = ‘doug’;

last = a.doug
eval([’last = a.’ name]) %BAD
last = a.(name) %GOOD

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By Doug Hull

10:23 UTC | Posted in Advanced MATLAB, PodCast, Video | Permalink |

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Wrap code fragments inside <pre> tags, like this:

<pre class="code">
a = magic(3);
sum(a)
</pre>

If you have a "<" character in your code, either follow it with a space or replace it with "&lt;" (including the semicolon).

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Recent Comments

  • Zach: Hi Doug and Les, I didn’t have a lot of time to mess with this, but I did find a work-around. I plotted...
  • hamed: k
  • Les: @Zach This isn’t exactly what you are looking for but at least it puts all three parameters on the same...
  • Zach: Thanks for your suggestions Doug. I’ll give that a shot and see what happens. I’ve seen many of...
  • Doug: @Zach, I would say to use plotYYY, because that is close to what you want, but using depth as Y makes sense....
  • Doug: @Teja, I think this will work: http://www.mathworks .com/access/helpdesk /help/techdoc/ref...
  • Gify: merry christmas :) nice christmas tree! Regards, Janet Gify
  • Teja: Dear Doug Is there anyway to plot a surface from nonuniform data without meshgrid and griddata? Basically i...
  • Zach: I’m working with geophysical data, so I’d like to produce a depth profile. The y-axis would be...
  • Doug: @Ashok First, please do not use variable names that are MATLAB commands (std and mean). Second, p(j) should be...

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