Suppose I have a containers.Map key/value collection with n entries (hundreds and more). Suppose all entries have a filed ‘My_Filed’ which is an array of 1x3 doubles.
I want to create a matrix of nx3 from all these values. Of course, I can achieve this by getting all values and use a ‘for loop’ to build the matrix (with pre-allocation for speed).
My question is: is there a faster way to create this matrix?