LabVIEW
Replace negative values from 2d array
Solved!
On a 1e5 x 100 2D array as given in the original problem description, the code shown in the image below seems slightly (120ms vs.130ms, or about 10%) faster than IR&C. (Somewhat surpising since there are extra arrays allocated)
Mads: If you post benchmarks, please also attach your test program. (Make sure to avoide accidental folding or deadstripping and disable debugging). Thanks!
Here is my benchmark (LabVIEW 2010). Most likely exact results will depend on the CPU architecture and other factors, such as the LabVIEW version.
Interesting results- don't you ever sleep?
I have to admit I thought of using IR&C but thought the math processor might be faster. Dropping the IR&C inside the looped in-place shows how much time penalty there is for a loop. Looks like a place to work on the optomizer since the loops really are not necessary.
It helps to be in another time zone...but with a 3 month old baby at home - No 
It was rather late when I posted the first reply though, so I did wonder if I was just too tired and had overlooked something when the solution seemed to be simpler than the ones that had already been suggested
On my older machine, AB's comparison method is significantly slower than IR&C (almost twice as slow).
This is comparable to IR&C on my machine:
Max&Min seems to have caught chicken pox.
