algorithmic modeling for Rhino
"For Loop" Problem...is it a bug?!
In VB.net: "For i = -5 to 5 Step .4"... The last item in the array should be "5.0" but comes out "0.0" (if we record "i" for each iteration of the loop). However, "For i = -5 to 5.0000001 Step .4" returns the expected value of "5.0". Why?
I've uploaded a simple example of this behavior. Is this normal or a bug?
I've uploaded a simple example of this behavior. Is this normal or a bug?
Views: 233
- Attachments:
-
-
Problem with 'For Loop'.ghx, 34 KB
-
Replies to This Discussion
-
Permalink Reply by Giulio Piacentino on
-
Hi Justin,
it's not a bug, it's normal. In the real world (as opposed to in mathematics), it's difficult having an infinite-precision representation of all numbers. So, floating point numbers are approximations of real values. You should take this into account: there might be rounding errors when adding two floating point values.
If you do not want rounding error sum ups, one way is to re-calculate the final value every time and loop over an integer value. Here an example:
For i = 0 To arrCount
'value = start + (increment * steps)
dblA(i) = (-5) + (.4 * i)
Next
I hope this helps,
- Giulio - Attachments:
-
-
rounding.ghx, 34 KB
-
-
-
Permalink Reply by Justin Diles on
-
Giulio: Thank you for the explanation and example. Makes sense. Best, J
-
About
Welcome to
Grasshopper
Translate
Search
Photos
Videos
© 2025 Created by Scott Davidson.
Powered by
