Error: Matrix dimensions must agree

I input this code but it gives me an error mesage for line 9>> h=A.*(x.^m)

ws=[2 4 6];

m=2/3;

A=0.067*(ws.^.44);

x=[0:1:200]

h=A.*(x.^m);

plot(x,h)

set(gca, 'Ydir','reverse');

[Sriram Tadavarty]

It rises because x and A are not compatible. To figure out what the compatible matrices are, have a look here.

Hope this helps.

Answer 1

[Sriram Tadavarty]

Hi Marcello,

Here is what happens, in your code. Place the annotations to help you understand.

ws=[2 4 6]; % w is a 1 x 3 matrix
m=2/3;      % m is a scalar 1 x 1
A=0.067*(ws.^.44); % A is a 1 x 3 matrix, since ws is 1 x 3
x=[0:1:200] % x is 1 x 201 matrix
h=A.*(x.^m); % Here is the issue, you are trying to have multiplication with (1 x 3)*(1*201)

%% So, to solve this, use make the minor modification
%% h = A'.*(x.^m); % Now you will get 3 x 201, as h value, making them all plotted in output
plot(x,h)
set(gca, 'Ydir','reverse');