conversion efficiency

[BooJay]

hi, I was a little puzzled by this question from my friend!

He has this for loop to create a double precison random number into an array!

now, he asked me which is better when he tries to convert the number into single precision number inside the loop & outside the loop!

aren't they both the same thing?!

Jay

[MikeS81]

Hi Jay,

i think outside the loop is faster, because it's only one operation. If the function can do it, then you should use it, because it should be optimized for it.

Mike

[GerdW · Accepted solution]

Hi BooJay,

conversion in the loop: the output tunnel already creates a SGL array.

conversion outside: the tunnel creates a DBL array, which is converted as a block to SGL - thus needing another block of memory.

As long as memory permits you may use both methods. The conversion in the loop uses less memory, but may run slightly slower...

[BooJay]

cool, thanks Mike 7 GerdW,

I can understand why now!

Thank you so much!

Jay