and also there is numel which gives number of elements. So, $\,\|k\vec v\| = |k|\cdot \|\vec v\|\. length gives the number of elements in vector, but size gives the number of columns and rows in an array. To find the size of each column in a 2D array, you can use the size function with the second argument set to 1. The correct formula for taking the square root of a square:įor all real numbers $\,x\,$ $\sqrt In Matlab, you can use the size function to get the dimensions (or length) of an array. However, the vector length formula certainly works-keep reading!
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