Error using ./ Matrix dimensions must agree.

Hi, I have this equation entered:

y=tan(r)*x-(g.*x.^2./(2*vo^2*(cos(r)).^2))+yo;

vo,g,and yo are all constant scalars.

x is a column vector with 17 entries

r is a row vector with 5 entries

When attempting to run the code I keep getting Matrix dimensions error. I want to make it so that each value of r multiplies with every value of x. Such that I will get a matrix with the values of y, with each value of r with varying x.

Any help would be greatly appreciated. Thanks.

Answer 1

[Steven Lord]

If you're using release R2016b you can take advantage of implicit expansion. You need to make one minor modification by replacing the first * operator (between tan(r) and x) with the .* operator.

[Massimo Zanetti]

Astonishing

Answer 2

[Massimo Zanetti]

To achieve what you want, you have to generate all possible copules of values from x and r (no matter their sizes). Given your vectors x,r, implement this:

x=x(:); r=r(:);
[R,X] = meshgrid(r,x);
Y = tan(R).*X-g*X.^2./(2*vo^2*cos(R).^2)+yo;

Then, Y will be your matrix.