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[mathcad] Re: Range Variable Problem
| [mathcad] Re: Range Variable Problem |
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Author: Allen, Jonathon
Posted: Tue, 21 Mar 2006 09:58:52 -0000
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Hi Bill,
A couple of points:
1) Generally, you need to make vx a vector of values rather than a range
variable i.e. declare vx[k-r:=k rather than vx:=k
2) You can't do polynomial regression on complex variables in this way.
If you think about it, what you are trying to achieve is a polynomial
relationship between a single-valued independent variable vx and a
multi-valued (both real and imaginary parts can vary) dependent variable
vy. Unless there is a pre-determined relationship between the real and
imaginary parts, there are an infinite number of solutions. In any case,
Mathcad's regression functions only accept real arguments.
If, as might be implied by the "magp" variable name in your sheet, you
are attempting to obtain a polynomial fit between the magnitude of the
complex number vy and the variable vx, this can be achieved but
obviously you'll need to create a new vector of magnitudes first and
then apply the regression process using this new vector.
Hope this helps,
Regards,
Jonathon
From: Bill E Dumke "mailto:Bill.Dumke"
Sent: 20 March 2006 15:54
To: Mathcad Discussion List
Subject: [mathcad] Re: Range Variable Problem
Thanks, Colin for the reply.
Now how do I get a polynomial regression to work with the new restricted
range vectors?
See attached.
Bill
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