File Exchange Pick of the Week

June 20th, 2007

Zero crossings on arbitrary signals

I have been working a lot with the technical support team here at the MathWorks. When the front line tech support people are stumped by technical questions, I try to give them a hand. Sometimes they need help because people want to do something in MATLAB that we at The MathWorks did not already put in the product. Inevitably, someone on MATLAB Central has already posted a file that does exactly what is needed.

Here is a case where the customer had some arbitrary signal data and wanted to know where it crosses zero. If this had been a continuous function of one variable, then I would have suggested fzero but with more arbitrary data, crossing.m by Steffen is exactly what we needed.

crossing4.jpg

By Doug Hull

08:00 UTC | Posted in Uncategorized | Permalink |

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a = magic(3);
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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...
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  • 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...
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  • 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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