MaplePrimes - answers and comments on Question, Using Maple to rearrage equation into real and imaginary parts

evalc, or assumptions

acer — Thu, 21 Feb 2008 02:17:26 Z

You can do this using Maple's Re() or Im() routines, but it helps if you can also inform Maple that the other quantities H1(k), etc, are purely real.

There are a few ways to do that. One way uses the fact that Maple's evalc assumes that names are generally real.

C(k) := H1(k)/(H1(k) + I*H0(k));

RC:=evalc(Re(C(k)));

IC:=evalc(Im(C(k)));

simplify( RC+I*IC - C(k) );

A second way is to utilize assumptions on those other names via Maple's `assuming` facility.

C := H1/(H1 + I*H0);

Re(C) assuming real;

Im(C) assuming real;

acer

Cleaned up

Will — Thu, 21 Feb 2008 03:24:50 Z

I removed the broken imageshack links from your post, and moved the images from your comment into the original post.

In the future, you can use the Green arrow in the toolbar to upload images directly into your post. There is no need to use a third party to host your images.

____
William Spaetzel
MaplePrimes Administrator
Software Developer, Maplesoft

Thanks for cleaning my

N1ghteyes — Thu, 21 Feb 2008 21:24:07 Z

Thanks for cleaning my thread up and thanks for the help.

Now say if i have a matrix [ A(w, k) B(w, k); C(w, k) D(w,k)] were A B C and D are dead long complex (as in have i in) expresions. Is there a way in maple to say get the determinate then rearrange the determinate into the form X(w,k)+iZ(w,k)

Then Rearrange Z in terms of w and rearrange X in terms of k?

... So far im have been doing it by hand ... just writing down X takes up a page...

Also H(k) is hankle funtion which = J1(k)+i*Y1(k)

were J1 is first order bessel function and Y1 is second order bessel function.

I know nothing about bessel functions but as they are in the terms A, B C and D i need to be able to rearrange that equiationand stated above into terms of k.

Is this even possible?

Thanks for the help

Craig

Ok well that was a waste of

N1ghteyes — Thu, 21 Feb 2008 22:05:29 Z

Ok well that was a waste of time i do not actually need to expand C(k), F1, F2 and F3 because these are just numbers. In the solver i am trying to program i can just enter these valuese as F1real + i* F1img.

Still is there a way to expand determinates of matrix in maple?

Thanks

I have now got the

N1ghteyes — Fri, 22 Feb 2008 20:29:32 Z

I have now got the formular

I am trying to use maple to put it in the form wsq(A)+B.

How can this be done. I can not get the factor comand to work. Thanks

Craig

collect

Robert Israel — Fri, 22 Feb 2008 22:12:31 Z

Try collect(%, wsq).