||A vector or a matrix.|
|| A positive integer whose default value is assumed to be |
|| A vector or matrix of numbers computed by differencing the input |
diffsn(x,s)returns the array
[ x[s+1]-x , x[s+2]-x , x[s+3]-x ....].
xis a matrix, the finite differnces are calculated column by column.
diffsn(x, s k)calculate the
k'thdifference by differencing the input array