function [bMat,wMat]=getBasicKernelMat(kernelMat,classFlags)

matSize=length(classFlags);
classNub2=length(find(classFlags>0));
classNub1=matSize-classNub2;

betweenMat=zeros(matSize,matSize);
betweenMat(1:classNub1,1:classNub1)=(1.0/classNub1)*kernelMat(1:classNub1,1:classNub1);
betweenMat((classNub1+1):matSize,(classNub1+1):matSize)=(1.0/classNub2)*kernelMat((classNub1+1):matSize,(classNub1+1):matSize);

wMat=diag(diag(kernelMat))-betweenMat;
bMat=betweenMat-(1.0/matSize)*kernelMat;