MaplePrimes - answers and comments on Question, Running parameter space searches

Simulate

acer — Thu, 26 Jan 2012 08:44:18 Z

You could try and run the loop in Maple itself, using the SetSubstitutions and Simulate commands? The runtime of MapleSim is generally accessible in the Maple interface, from a set of commands (an API).

Basic syntax might look something like this:

A := MapleSim:-LinkModel('filename' = "yoursavedmodel.msim"):

A:-GetSubstitutions(); # shows you the present set of parameter values

for x from value1 to value2 by increment_value do

   A:-SetSubstitutions({`modelandparamname` = newvaluecomputedfromx})

   arrayofresults := A:-Simulate(output=datapoint, anyotheroptions);

   # You may want returnTimeData=true as an option to Simulate().
   # Each column of output Array is from a separate probe (by row w.r.t. time)

   ExportMatrix(filename, Matrix(arrayofresults));

   # Or export with writedata, or whatever.
   # You might want to use a different export file for each value of x,
   # by using something like cat("basename","_",convert(x,string)) for 'filename'.

end do;

I suspect that instead of calling SetSubstitutions() you might be able to pass the changing parameter value directly to Simulate() as an option like 'params={name=value}'

acer

Thank you

rwong1231 — Fri, 27 Jan 2012 01:36:29 Z

Hi Acer,

Thank you so much for your feedback. I will give that a try.

Cheers.

It works!

rwong1231 — Sun, 29 Jan 2012 01:38:55 Z

Thank you so much Acer! I followed your format and did a simple routine via the RLCcircuit.msim file.

Cheers,

Ron.

My test routine:

A:= MapleSim:-LinkModel('filename' = cat(kernelopts('toolboxdir' = MapleSim), kernelopts('dirsep'), "data/examples/RLCcircuit.msim"))

for x from 1 to 10 do

A:-SetSubstitutions({`Main.'RLC::C'` = x}),

arrayofresults := A:-Simulate(output = datapoint, returnTimeData = true)

ExportMatrix(cat("matlabresults_", convert(x, string), ".xls"), Matrix(arrayofresults))

end do