What is the correct equation?

>> t=linspace(0,2*pi,100);

>> y=5*t.*(sin(t).^2)-t.^2*(cos(t).^2);

Error using *

Incorrect dimensions for matrix multiplication. Check that the number of columns in the first matrix matches the

number of rows in the second matrix. To perform elementwise multiplication, use '.*'.

The equation I'm trying to input is: y=5*t*sin^2(t)-(t^2)*cos^2(t)

Answer 1

[Walter Roberson]

y=5*t.*(sin(t).^2)-t.^2.*(cos(t).^2);

You should probably get in the habit of always using .* and .^ and ./ every time, until you finally encounter a situation where you need to use inner product * or matrix exponential ^ or least squared solutions to equations /