The linspace function produces a vector of fixed length (defined by the third argument) between the limits defined by the first two. The function determines the step size.
The colon operator defines a vector from the start, step, and end values, and as the result the length is determined by those values.
I generally use linspace when I want to determine the length, and usually use the colon operator when I want integer values in the vector. Personal preference, others likely have different views.
