TheBjorckandPereyraalgorithmsusedforsolvingVandermondesystemofequationaremodifiedforthecasewherethepointsaresymmetriclysituatedaroundzero.Theworkingoperationissavedabouthalf.Aforwarderroranalysisispresentedforthemodifiedalgorithms,andit'sshownthatifthepointsaresituatedinsomeorder,theerrorboundareasgoodasHigham'sresultin1987.