Plotting Complex Functions in MATLAB: Understanding Period Placement

[dillonmhudson]

Matrix "." Help in MATLAB

Here is my code:

f=linspace(0,1000,1000);
xf=abs((1-exp(1-2*pi*f.*1i))/(2*pi*f.*1i-1)+(((exp(4*pi*f.*1i)-1)*exp(1-6*pi*f.*1i))/(2*pi*f.*1i))+(((2*pi*f.*1i-1)*exp(1-6*pi*f.*1i)+exp(1-10*1i*f.*pi))/(8*pi^2*f.^2*1i)));
func=plot(f,xf)

I just need to know where the periods need to go, I don't get what I'm doing wrong.

TIA

 

[jhae2.718]

Use periods in front of operators where one of the operands is a matrix if you want an element-by-element operation. It would probably be easiest just to replace every * and / with .* and ./

 

[dillonmhudson]

Great! Got it working, thanks for the help!

 

[jhae2.718]

No problem.

When you aren't wanting to do matrix calcs, make sure to use element-by-element operators otherwise MATLAB will throw errors when trying to multiply matrices with incompatible dimensions.

There's also a built-in function that will do this for certain expressions called http://www.mathworks.com/help/techdoc/ref/vectorize.html".

 

[dillonmhudson]

Ok, quite the noob with MATLAB right now. I have heard of vectorize though! Thanks