topic Extra accuracy STR{2} in Libraries & objects

Extra accuracy STR{2}

Anonymous — Wed, 05 Jul 2017 19:11:27 GMT

Hello!
I need to mathimatic rounding:
0.0245 -> 0.03

But in this code

value = 0.0245
string_result = STR("%.2", value)

i have
0.02

May be i need to use STR{2} with extra accuracy flags...
But in documentation of GDL no examples ((

Please, help me!)

Re: Extra accuracy STR{2}

Anonymous — Thu, 06 Jul 2017 01:20:38 GMT

Tsepov wrote:
Hello!
I need to mathimatic rounding:
0.0245 -> 0.03

But in this code

value = 0.0245
string_result = STR("%.2", value)

i have
0.02

May be i need to use STR{2} with extra accuracy flags...
But in documentation of GDL no examples ((

Please, help me!)

2.4xxx will mathematically round to 2.0
The rounding point is 0.5

If you add something to it then it will round, but no program i know will round a 0.4 to the next hole number...

With crazy clients who wanted custom rounding, we built rounding factors that we added to numbers to get the desired result, i.e. you could add 0.005 to your 0.0245 to give you a roundable number
therfore
a 0.02450001 that displays 0.025 at 3DPs and displays as 0.02 at 2DPs

becomes 0.02500001 that displays as 0.025 at 3DPs and displays as 0.03 at 2DPs

it depends on the level of accuracy that you work in...

Re: Extra accuracy STR{2}

runxel — Thu, 06 Jul 2017 12:35:55 GMT

I suppose you don't actually want to "round" something, but to make it always bigger. This is called ceiling.
There is indeed a function called "CEIL" in GDL, but the result will be of course Integer, not Float:

c = CEIL(-2.25 )   ! =-2

w = 25.276
w = CEIL(w)        ! w=26

So if you want it to remain Float you need to e.g.

con = 100

n = 0.0245
n * con    ! n=2.45

n = CEIL(n)     ! n=3

n = n / con     ! n=0.03