I'm getting an error in the line with product (count)= A*B/C

function [ out ] = triangle_wave( n )
%TRIANGLE_WAVE Summary of this function goes here
%   Detailed explanation goes here
t = 4*pi/1001;
tvector = 0:t:4*pi;
for count = 1:n+1
    A= -1^(count-1);
    B = sin((2*(count-1)+1)*tvector);
    C = (2*(count-1)+1)^2;
    product(count) = A*B/C;
end
for count =0:n
    out = out + product(count)
end

end

I get an error in line 10. IT says subscripted assignment dimension mismatch. What does this mean?

Answer 1

[DJ V]

Received an answer elsewhere.

Answer 2

[Adam]

It means that

size( product(count) )

does not evaluate to the same thing as

size( A*B/C )

so trying to assign the latter into the former gives a dimension mismatch. product doesn't appear to be predefined anywhere so unless A*B/C results in a scalar this will not work.

e.g. the following code, in a completely clean workspace gives this error too:

a(9) = [3; 4];

because a does not exist and therefore a(9) will be assumed to be scalar if it were to be created at this moment. [3; 4] obviously is not scalar.

a(9) = 3;

works fine and creates a row vector of 8 zeros preceding the 3;

If you are trying to assign multiple dimensions to a result then you should have multiple dimensions on the left-hand side of the = also in general.

[DJ V]

I fixed the output and simplified it. It is still producing the wrong answer.