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Absolute value

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Nu9
Nu9 am 13 Sep. 2011
hi, i need to get the Absolute value of this:
f=(vv(1,1)-vv(1,2,1,m))+(vv(1,1)-vv(1,2,1,m))+(vv(2,1)-vv(2,2,1,m))+(vv(3,1)-vv(3,2,1,m))+(vv(4,1)-vv(4,2,1,m))+....
i need to do a sum(from 1 to 22) of absolute values of the difference -> vv(x,y)-vv(x,y,w,z)
how can i make that?

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William
William am 13 Sep. 2011
Can you define "vv"? If it is composed of real numbers
fabs = abs(f)

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