我希望计算perl中每一行数字的方差。0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98,0.98