From: Harley Wei on
I want to solve some questions in Matlab7.0 like

solve('angle(1-1/(i*x+0.5))=pi/2','x')

but
???Error using ==>solve
'angle(1-1/(i*x+0.5))=pi/2' is not a valid expression or
equation.

why angle() can not work in solve(), but abs() does.
How can I do if I want to solve this question, thanks.