how to find argument or angle of a complex number in matlab?

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bsd
bsd 2011-6-30
评论： Seungho Kim 2018-12-3
Dear sir/madam,
How do we find the argument of a complex number in matlab?
If I use the function angle(x) it shows the following warning "??? Subscript indices must either be real positive integers or logicals."
I am using the matlab version MATLAB 7.10.0(R2010a).
Please reply as soon as possible, since this is very much needed for my project. Looking forward for your reply.
Thanking you, BSD

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采纳的回答

Sean de Wolski
Sean de Wolski 2011-6-30
That error you're seeing has to do with the syntax or variable you're referencing when you call angle. Did you overwrite angle() with a variable?
whos angle
clear angle
angle(2+4i) %works

更多回答（2 个）

Daniel Shub
Daniel Shub 2011-6-30
The function angle is the correct function. The error is unrelated. You are likely not simple calling
angle(x)
but rather
angle(x(y))
where y is either a scalar or an array, but with at least one element that is not a real positive integer as the error tells you.
If you truly are only calling angle(x)
then you must have defined a function someplace on the search path called angle.
Fangjun Jiang
Fangjun Jiang 2011-6-30
>> angle([1+i,1-i,i,-i])
ans =
0.7854 -0.7854 1.5708 -1.5708
Do you have a variable called "angle" of your own?

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