for(int i=0; i<this.numberOfColumns; i++){
double[] hold = new double[this.numberOfRows];
for(int j=0; j<this.numberOfRows; j++){
hold[i] = this.matrix[j][i];
}
Stat st = new Stat(hold);
standardDeviations[i] = st.standardDeviation();
}
return standardDeviations;
}