Hi, I am new to MATLAB. I am not getting the plot .

I am trying to plot N=5; A=-20:5:20; B=(1/N)*(abs((sin((N*A)/2))/(sin(A/2)))); plot(A,B)

I am not getting any error but getting only one value for B. Help please. Thank You in advance

Answer 1

[Chad Greene]

You're doing vector operations, so use the ./ when calculating B like this:

B=(1/N)*(abs((sin((N*A)/2))./(sin(A/2))));

The . before operators such as .* is the difference between a cross product and a dot product, and the same logic follows for division and exponentials.

[Kshitija Bagde]

working. thank you

Answer 2

[Jim Riggs]

Inside the abs function you are dividing two vectors. This is where the error is.

[Kshitija Bagde]

But when manually calculated, for every value A, there is different answer. Also not getting when abs is deleted

[Jim Riggs]

You should review your Matlab introductory material for operation syntax. Matlab uses different syntax to determine when a matrix operation is to be performed (as you have specified) vs. a scalar operation (as Chad has shown in his answer). You need to be familiar with these concepts.