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public int Gauss_Jordan(double[][] matrix, int numOfRows, int numOfCols) { for (int col_j = 0; col_j<numOfCols; col_j++) { row_i = nonzeros ++; System.out.println(row_i+" and "+nonzeros); } //return matrix; return 0; }

up above in the method called "Gauss_Jordan", you can see a for loop where it iterates until a certain condition is met. (duh.. lol sorry).

so i set row_i = nonzeros++ but here's the thing, when I print out each iteration i get

  • 0 and 1,
  • 1 and 2,
  • 2 and 3

. I would expect the output to be:

  • 1 and 1,
  • 2 and 2,
  • 3 and 3.

How come this is not the case?

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2

3 Answers 3

Reset to default
4

You'd need ++nonzeros instead of nonzeros++ to get what you expect.

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5 Comments

@HovercraftFullOfEels ... Pretty sure he was ..... what's the issue?
time to drink more coffee. that's the issue. sorry.
@HovercraftFullOfEels go back to the java tutorial .... ;-) docs.oracle.com/javase/tutorial/java/nutsandbolts/op1.html
@rolfl: my eyes weren't seeing things clearly. 1+ to bruno and sanbhat.
+1 from me on the coffee ;-)
4

Thats called post-increment;

When you say row_i = nonzeros ++;

first the row_i will get assigned with the value of nonzeros and the nonzero will get incremented.

try pre-increment

row_i = ++nonzeros;
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0

If pre-increment is not what you wanted. Check the initialization of nonzeros and change it into '1` for it to show up as you want. Your codes are functioning as they should.

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