Matrix dimensions must agree.

Help me, Matlab print the next error.

Matrix dimensions must agree. Error in Grafica (line 4) Vt = (3./(n.*pi)).*(2-cos(-(pi.*n))-cos(pi.*n)).*sin(pi.*n.*t);

This is my code:

clc; clear all; close all
n = 0:1:10;
t = 0:0.01:10;
Vt = (3./(n.*pi)).*(2-cos(-(pi.*n))-cos(pi.*n)).*sin(pi.*n.*t);
plot (Vt)
end

Answer 1

[Star Strider]

Yes, they must.

However you can get round that restriction by using the meshgrid function:

n = 0:1:10;
t = 0:0.01:10;
[N,T] = meshgrid(n,t);
Vt = @(n,t) (3./(n.*pi)).*(2-cos(-(pi.*n))-cos(pi.*n)).*sin(pi.*n.*t);
plot (t, Vt(N,T))
grid on

Experiment to get the result you want.

[Daniel Rincón]

Thank you, it works perfectly

[Star Strider]

As always, my pleasure.

Answer 2

[Jonathan Chin]

n.*t

n and t don't match dimensions, when you do .* you are trying to do an element wise multiplication, since they are not the same length it gives you that error.

I think this is what you are trying to accomplish

n = [0:1:10].';
t = 0:0.01:10;
Vt = bsxfun(@times,sin(pi.*n*t),(3./(n.*pi)).*(2-cos(-(pi.*n))-cos(pi.*n)));
plot (Vt.')

I created your sine wave for every n against the array t, this creates a 11x1001 matrix, with a sin wave on each row corresponding to n

sin(pi.*n*t)

Then every column gets element wised multiplied by a 11x1 column using bsxfun(@times...)

(3./(n.*pi)).*(2-cos(-(pi.*n))-cos(pi.*n)) %11x1 column

Finally I transpose the matrix so plot can show each individual sine wave