How to convert vector or matrix to double array?

[chenyu468]

I want to calculate the data through matrix and convert the one vector to array for indicator show. 

And it is found there is no output array function in matrix or vector. the "row" or "col" member only output vector.

https://www.mql5.com/en/docs/basis/types/matrix_vector

Is it necessary the get all elements through loop into array?