Groups > comp.soft-sys.math.mathematica > #2729

Filtering of the higher frequency terms.

From	Srinath Byregowda <sbyregow@asu.edu>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Filtering of the higher frequency terms.
Date	2011-05-25 23:32 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<irk3ij$790$1@smc.vnet.net> (permalink)

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Hello Group,

I had a favor to ask. I am working on reducing the terms of a nonlinear
transmitter model.

The equation has thousands of terms, in which I need to remove the higher
frequency terms. The terms have "w" in them which is the higher frequency
and "w1" and "w2" which are the lower frequency terms.

I have written a perl script to delete all the terms that have w in them.
And the script is working fine.

However, there are some terms such as (G^2 Sin[ptx + (t - td) w - (-rtx + t)
w1 - (-rdtx - rtx +t) w2 - wt])/(4 K^2). Terms like these are being deleted
but I do not want them to be deleted because +wt and -wt will actually get
cancelled and its lower frequency term..


I want to know if there is a command simplify the parameters inside the
brackets of Sin expression.


Any help would be greatly appreciated.

Thanks,
Srinath

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Thread

Filtering of the higher frequency terms. Srinath Byregowda <sbyregow@asu.edu> - 2011-05-25 23:32 +0000
  Re: Filtering of the higher frequency terms. David Bailey <dave@removedbailey.co.uk> - 2011-05-29 11:37 +0000

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