How do you drop the 'abs' that's sometimes attached to an output when we use the 'norm' function?

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RIchard J
RIchard J 2015-11-14
回答： Walter Roberson 2015-11-15
Here is some sample code:
%
syms a theta
param = [a*cos(theta), a*sin(theta), 0]
norm(param)
%
The output is:
(abs(a*sin(theta))^2 + abs(a*cos(theta))^2)^(1/2).
What I want to see is:
(a^2*sin(theta)^2 + a^2*cos(theta)^2)^(1/2)
or the even more simplified version:
a
Any ideas?

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回答（1 个）

Walter Roberson
Walter Roberson 2015-11-15
syms a theta real
and you might want to simplify() the result of the norm()
The abs() is there because complex values are assumed.

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