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Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: volume integration
Replies: 10   Last Post: Dec 5, 2012 5:57 PM

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Marios Karaoulis

Posts: 82
Registered: 5/10/10
Re: volume integration
Posted: Sep 9, 2011 3:16 PM
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Thanks so much Bruno. You blew my mind.

One last question,

For every node, actually I need to evaluate the integral 4 times.
Using the same notation,
I have
JA JB JM JN

The integration is
triple integral ( (JAJM -JAJN -JBM +JBN))

So, if I change the last part to something like this

JAJM = dot(JA,JM,3);
JAJM = mean(JAJM,2);

JAJN = dot(JA,JN,3);
JAJN = mean(JAJN,2);


JBJM = dot(JB,JM,3);
JBJM = mean(JBJM,2);


JBJN = dot(JB,JN,3);
JBJN = mean(JBJN,2);


J_ALL=(JAJM-JAJN-JBJM+JBJN)

jac2 = J_ALL.*abs(D)/6;


it should be alright.

But is possible to write this in the following way

J_ALL=dot(JA-JB,JM-JN,3)
J_ALL=mean(J_ALL,2)

thanks in advance.

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