On 10/5/13 8:47 AM, Tim Shoppa wrote:
How slow of a processor are you working with? A modern PC using a general
purpose graphing and fitting tool (e.g. gnuplot) will fit tens of thousands
of points in a fraction of a second.
http://people.duke.edu/~hpgavin/gnuplot.html
If you want to do this in your own code, there are lots of least-squares
fitting examples in every first year numerical analysis textbook in every
computer language ever written (I learned this in FORTRAN 4 naturally).
http://en.wikipedia.org/wiki/Least_squares
If you have hardware substantially more primitive (e.g. a PIC, a bag of
2N2222's and 555's, etc.) you have to do the fit on, then it's an
interesting problem :-)
In the future, more the latter than the former. 48 MHz ARM Cortex-M4,
for instance.
For now, though, yeah, it's on a not very fast PC (Windows Experience
Rating around 2), but compiled matlab does it very quickly. But, given
that sooner or later I'm going to be heading for a more resource
constrained environment, or trying to FPGA it, I'm looking for simple
algorithms to implement the simplified models.
And, of course, I don't want to drag in all the libraries that one gets
with Matlab,Octave,gnuplot, etc.
They're great for figuring out what's going on and trying out the
algorithms.
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