for looping prob

Rosmayati · #1 30-Jun-2004, 10:32

I'VE TRIED THE FOR LOOPING AS BELOW, BUT THE OUTPUT I'VE GOT DIDN'T APPEAR AS I WANT. I THINK THERE'S SOMETHING WRONG WITH THE LOOP CONDITION. ANYBODY THERE CAN HELP ME. THANKS IN ADVANCE

the source code:

CPP / C++ / C Code:

for (i1=0; i1<nrow; i1++)
{
	for (i2=0; i2<i1; i2++);
   {
   	for (j=0; j<ncol; j++)
      {
      	var1 = (A[i1][j] - A[i2][j]);
         var2 = pow(var1,2);
      	Adiss[i1][i2] = Adiss[i1][i2]+ (0.5*var2);
         fprintf(adissfile, "i1[%d]j[%d]: %lf\ti2[%d]j[%d]: %lf\ti1[%d]i2[%d]: %lf\n", i1, j, A[i1][j], i2, j, A[i2][j],i1, i2, A[i1][i2]);
      }
      //Fill the other half of the array
      Adiss[i2][i1] = Adiss[i1][i2];
   }
}

the output
i1[0]j[0]: 5.100000 i2[0]j[0]: 5.100000 i1[0]i2[0]: 5.100000
i1[0]j[1]: 3.500000 i2[0]j[1]: 3.500000 i1[0]i2[0]: 5.100000
i1[0]j[2]: 1.400000 i2[0]j[2]: 1.400000 i1[0]i2[0]: 5.100000
i1[0]j[3]: 0.200000 i2[0]j[3]: 0.200000 i1[0]i2[0]: 5.100000
i1[1]j[0]: 4.900000 i2[1]j[0]: 4.900000 i1[1]i2[1]: 3.000000
i1[1]j[1]: 3.000000 i2[1]j[1]: 3.000000 i1[1]i2[1]: 3.000000
i1[1]j[2]: 1.400000 i2[1]j[2]: 1.400000 i1[1]i2[1]: 3.000000
i1[1]j[3]: 0.200000 i2[1]j[3]: 0.200000 i1[1]i2[1]: 3.000000
i1[2]j[0]: 4.700000 i2[2]j[0]: 4.700000 i1[2]i2[2]: 1.300000
i1[2]j[1]: 3.200000 i2[2]j[1]: 3.200000 i1[2]i2[2]: 1.300000
i1[2]j[2]: 1.300000 i2[2]j[2]: 1.300000 i1[2]i2[2]: 1.300000
i1[2]j[3]: 0.200000 i2[2]j[3]: 0.200000 i1[2]i2[2]: 1.300000
i1[3]j[0]: 4.600000 i2[3]j[0]: 4.600000 i1[3]i2[3]: 0.200000
i1[3]j[1]: 3.100000 i2[3]j[1]: 3.100000 i1[3]i2[3]: 0.200000
i1[3]j[2]: 1.500000 i2[3]j[2]: 1.500000 i1[3]i2[3]: 0.20000

dabigmooish · #2 30-Jun-2004, 11:39

What output were you hoping for?

The second loop (the first nested loop) won't even run the first time(while i1 = 0). Maybe thats where your problem comes in.That means first time var1 is set its gonna equal: var1 = A[1][0] - A[0][0] the second time its gona be A[1][1] - A[0][1] and so on. If this is what you want you could just leave the second loop out and put:

CPP / C++ / C Code:

for (i1=0; i1<nrow; i1++)
{
     for (j=0; j<ncol; j++)
     {
          var1 = (A[i1][j] - A[i1-1][j]);
          var2 = pow(var1,2);
          Adiss[i1][i1-1] = Adiss[i1][i1-1]+ (0.5*var2);
          fprintf(adissfile, "i1[%d]j[%d]: %lf\ti2[%d]j[%d]: %lf\ti1[%d]i2[%d]: %lf\n", i1, j, A[i1][j], i1-1, j, A[i1-1][j],i1, i1-1, A[i1][i1-1]);
     }
      //Fill the other half of the array
      Adiss[i2][i1] = Adiss[i1][i2];
}

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