How to solve the error in the following code ''Index Exceeds matrix dimension"?

nt = 100;
nz = 60;

x=linspace(0,2*pi*50,nt);
y=linspace(-80,20,nz);

[X,Y]=meshgrid(x,y);  

for i = 1:nt
    for j = 1:nz
        G(i,j) = 5-(3*cos(X(i,j)/50)); %#ok<SAGROW>
    end
end
[n3,n4]=size(G) %#ok<NOPTS>

Why this code generates the dimension as 120 * 120.

Kindly Help.

Answer 1

[Star Strider]

You need to reverse the index assignments:

for i = 1:nz
    for j = 1:nt
        G(i,j) = 5-(3*cos(X(i,j)/50)); %#ok<SAGROW>
    end
end

However you can avoid the loops entirely:

G = 5-(3*cos(X/50));

This produces the same result.

‘Why this code generates the dimension as 120 * 120.’

I cannot reproduce that. When I run it, ‘G’ is (60 x 100).

[Manas Ranjan Pattnayak]

Thank You So much Sir. It Worked.

[Star Strider]

As always, my pleasure.