How to get the modulus of complex symbolic expression?

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Raptrick
Raptrick 2017-11-15
评论： Raptrick 2017-11-15
Dear all,
I want to calculate the modulus of complex symbolic expression but I do not get explicit results:
syms a b;
assume(a>0);
assume(b>0);
z = a + sqrt(-1)*b;
zabs = abs(z)
Results in:
zabs =
abs(a + b*1i)
I was expecting zabs = (a^2 +b^2)^(1/2). How do I get the result I want?
Patrick

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采纳的回答

Walter Roberson
Walter Roberson 2017-11-15
rewrite(zabs, sqrt)

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