0
$\begingroup$

I doubt because you have 9 multiplications and you are adding 9 numbers together, when using a 3x3 convolution matrix.

Adding 9 numbers: 1+2+3+4+5+6+7+8+9

We are performing 8 additions as we repeat the operation of 'adding' 8 times (8 times a '+' sign).

We can say there are 9 additions as well, if you would accept a definition like: 0+1+2+3+4+5+6+7+8+9

But what does make more sense for computers: 8 adds or 9 adds?

Improve this question
$\endgroup$
1
$\begingroup$

As you have 9 terms to add together, your computer will perform 8 additions as each addition needs two inputs. So you have 9 multiplications and 8 additions.

Improve this answer
$\endgroup$
2
  • $\begingroup$ A computer does memory operations as well, like pop and push (intel architecture). Those don't count as addition? $\endgroup$ – user8005 May 30 '13 at 3:53
  • 9
    $\begingroup$ Counting instructions is not the same as counting arithmetic operations. The instructions required to perform 9 muls and 8 adds may vary a great deal dependent on the target. $\endgroup$ – niaren May 30 '13 at 6:50

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.