That does work, if you use: if ($a < $b) -Paulo Almeida stephan rosecker wrote: > Hi, > > is it possible to compare e-values with perl, bioperl or some module ? > e.g: > $a=1.6e-190; > $b=1.8e-300; > if (a < b) > ... > > of course this operator dosn't work ... ;-) > > regards, > stephan