Rounding a float to the nearest multipul
BlitzMax Forums/BlitzMax Programming/Rounding a float to the nearest multipul
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| Hi been trying for a hour to do this without much luck I have Have some arrays Gridz[9,9,9] Gridx[9,9,9] Gridy[9,9,9] For x=0 to 8 For y=0 to 8 For z=0 to 8 Gridx[x,y,z]=-256+(64*x) Gridy[x,y,z]=256-(64*y) Gridz[x,y,z]=-256+(64*z) next next next Next i Create 3 random floats within the range of -256 to 256 floatx#=Rnd(-288,288) floaty#=Rnd(-288,288) floatz#=Rnd(-288,288) now comes my problem I want to Get these values in ints so i can find out what was the closest Grid array in x,y,z So Floatx,Floaty,Floatz need to be Rounded to the nearest multipul of 64 anyideas welcome thanks |
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| X = Int (FloatX)/64 or x = int (FloatX +32)/64 |
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| Your post made absolutely no sense to me. But if you want to know the nearest multiple of 64 to a floating point value, then all you need to do is this: Mul = Floor(Floatx#/64) * 64 Ie, find out how many times 64 goes into the floating point value, (say, 2.5) discard any fractional bits, (2) then multiply the result by 64 to get the nearest multiple. Unless by nearest multiple you don't mean nearest multiple without going over, but rather, nearest as in the multiple can be higher than the value, but the difference is less than that of the nearest multiple which is lower than the value. In that case, I think you just have to add 0.5 to FloatX#/64 before you floor it to get it to do banker's rounding. |
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X = Int((floatX / 64) + 0.5) * 64 [edit] Hmmm...Getting a cup of tea, and not refreshing before you post is never a good idea...Ah well...*slurp*... [/edit] |
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| Like sswift says. Or rather :- nearestMultiple = value - (value Mod 64) [Edit] - but that's not right is it.. I'll get my coat. |
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