Processing purely imaginary numbers

Hey,

I've got a vector of purely complex numbers (ie. the real component = 0). However the processing time of it is taking a long time and I think it's because MATLAB is doing conjugate multiplication. When I print out the vector is is in the form 0 + bi .. how can I make Matlab just read it as a purely imaginary number such as bi and process it quicker?

Thanks for your time, Alex.

Answer 1

[Adam]

You can just use

imag( myVector )

to get the imaginary part as a standard non-complex double and then do your maths on that, as though it where the imaginary component.

[Alex Wylie]

I didn't meant to accept it, I actually need to do my maths on an imaginary number and imag(A) just gets the imaginary component of the vector and turns it real. I need imaginary ...

[Adam]

Does the maths re-introduce a real part? In which case there is probably no alternative to just using it as is. If it doesn't I don't see why you need it as imaginary. You can turn it back to imaginary at the end of the maths if it stays purely imaginary throughout.