Category Archives: data analysis

A recursive one-dimensional search routine

Posted on January 31, 2013 by

Ron Kneusel recently shared with our PWUISATAI group a recursive 1D golden section search routine (no derivatives necessary) that he’s used to locate function minima. Here’s the source code for Ron’s routine, GOLDENSECTIONSEARCH. To use it, say I want to … Continue reading →

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Calculating the period of the sunspot cycle

Posted on November 8, 2012 by

Two weeks ago, I used the sunspot number data provided by the Solar Physics Group at NASA’s Marshall Space Flight Center to demonstrate positioning plots in window. This week, I’d like to show how to calculate the period of the … Continue reading →

Posted in data access, data analysis, visualization | Tagged , , , , , | 5 Comments

An LSD radix sort algorithm in IDL

Posted on April 19, 2012 by

(Note: I’m at the HDF and HDF-EOS Workshop XV this week, so today I have a guest post by Atle Borsholm, a Senior Consultant in the Exelis VIS Professional Services Group. Atle is an IDL master. I’m trying to persuade … Continue reading →

Posted in data analysis, language, programming | Tagged , , , , | 6 Comments