a matrix and the linear index of an element is given as input.
find the subscripts of that element.
if linear index=3 ,
Whether the input is vector?
Number of digits in an integer
Maximum value in a matrix
Matrix to column conversion
Repeat elements of a vector
remove numbers from a string
create a matrix y of size (n+1) whose last column's elements are the summation of the elements of all the other columns and last row's elements are the summation of the elements of all the other rows; where 'n' is the size of the input matrix 'x'.
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