float[] rTOT1;
rTOT1 = new float[j];

for ( j = 0; j < rTOT1.length; j++) {
float minValue = rTOT1[0];
rTOT1[j] = (alfaTOT * rSRC + betaTOT * rSRC) / depthSrc;
if (rTOT1[j] < minValue) {
...