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least square error for a sinusoid [message #41042] Wed, 15 September 2004 15:31
yaj is currently offline  yaj
Messages: 6
Registered: July 2004
Junior Member
Hello,
I am fitting a function of the form
ASin(wt + theta) + constant to a set of points. Instead of a readymade
fitting routine from IDL (to avoid any potential problems with small numbers
later), I use the three linear equations to minimize the least square error,
then use an IDL function to solve the matrix equation. Could someone suggest
a simple way to calculate the least squares error and goodness of fit using
some higher level IDL functions ?
Thanks in advance

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