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

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

Answer 1

[Sean de Wolski]

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

[Daniel Shub]

Man, I thought I was going to beat you.

[Seungho Kim]

never

Answer 2

[Daniel Shub]

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.

Answer 3

[Fangjun Jiang]

>> 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?

[mosaeb ahmed]

ok