SDEV

This operation calculates the standard deviation of the statistics data. It expects to find a variable called ∑DAT which has a set of statistics values stored in a real matrix. Each row in the real matrix represents a single set of samples. Each column contains one of the set of values associated with a single sample. The operation calculates the standard deviation of each column of data in the real matrix and pushes the result into the stack.

If the real matrix has a single column, then a real value which is the standard deviation of all values in that column is pushed onto the stack. If the real matrix has two or more columns, then a real vector with the same number of columns is pushed onto the stack where each value in the vector is the standard deviation of values from that column.

Note that the ∑DAT must have at least two rows in order to calculate a standard deviation.