Repeating a function for different values that involves imaginary numbers.

I am working on getting the output for a function that includes the calculations of imaginary numbers. It works when I have

f=[1000:1000000]

w=2*pi*f

X=0.2/j*w,

However, when I takes Y=1/X, the calculation failsa and I get no output. Sorry if the question is too shallow as I just learning this tool recently.

Answer 1

[Voss]

Use ./ instead of /

Y = 1./X;

The difference is listed here:

https://www.mathworks.com/help/matlab/matlab_prog/matlab-operators-and-special-characters.html

[Voss]

Also, you probably mean

X = 0.2./(j*w)

That is, the w should be in the denominator with the j.

Also, for clarity use 1j instead of j.

X = 0.2./(1j*w)

[Gee]

Yes, I mean X = 0.2./(j*w). I wonder what is the difference between 1j and j in term of clarification?

[Voss]

"what is the difference between 1j and j"

No difference, unless you have a variable j already defined, in which case j is that j.

1j is always the imaginary unit, which is why it's more clear.

[Gee]

Thank you for the clarification. I now see the importance of clarity in using Matlab.

[Voss]

You're welcome. Any other questions, let me know. Thanks!

Answer 2

[Torsten]

X is a vector, not a scalar.

The elementwise division of 1 by a vector has to be coded as

1./X

instead of

1/X

https://uk.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html

[Gee]

Thank you for replying. The page you provided is very helpful.