Adding noise to a sine wave

Hi, I get error: Attempt to reference field of non-structure array. Error using + Matrix dimensions must agree.Error in (line 19), y=x+(alpha.v)

for following code please:

fs=8000;

tmax=4/360;

fangular=pi/10; % angular frequency (rad/sample).

n=1:fs*tmax;

A=1.2; % Amplitude

x=A*sin(n*fangular);

v=randn(1,64);

alpha=0.1;

noise=alpha*v;

y = x + noise;

plot(y)

Answer 1

[Jos (10584)]

The expression "v.alpha" is interpreted by matlab as the contents of the field "alpha" of the structure variable "v". This is probably not what you meant.

You create v as a 1-by-64 array, and alpha is a scalar. I assume you want to simply multiply all elements of v by alpha, therefore:

v .* alpha

or, since alpha is a scalar,

v * alpha

[Aswas]

Thanks Jos, but neither works, same error please: Error using + Matrix dimensions must agree.

Error in (line 20)

y = x + noise;

[Aswas]

Thanks I found answer from another question in this forum.