Abs and angle of complex number with symbolic object
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Hi,
If r=sym('a')*exp(j*sym('b')) is a symbolic object, and
1. if I write abs(r), I get abs(a).....I need get only "a" without abs
2. if I write angle(r), I get error
??? Undefined function or method 'atan2' for input arguments of type 'sym'.
Error in ==> angle at 14 p = atan2(imag(h), real(h));
Can you help me please? How can I solve this?
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Walter Roberson
le 5 Mar 2013
There is no "complex argument" function for symbolic variables exposed at the MATLAB level. You can, though, define
arg = @(V) feval(symengine, 'arg', V);
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Brian B
le 4 Mar 2013
Modifié(e) : Brian B
le 4 Mar 2013
Well, for part 1 you have to assume a is a non-negative real:
syms a
assume(a>0)
Then
>> abs(a)
ans =
a
I have not tried the second part, but you can imagine dividing by the magnitude and taking a log....
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