Rounding off problem?

Hi,
I think I have a problem that Grasshopper rounds off the numbers. I have attached three screendumps. I am using Grasshopper Version 0.6.0038.
Picture RoundingOffProblem2.jpg shows the problem. I have one smooth curve in red for which I want to define the steps per index. Blue curve minus red curve = yellow curve (note that yellow curve is scaled). (see the grasshopper screendump RoundingOffProblem1.jpg where Xposition is the data for the red curve, the shift function is the bleu line and the Minus funtion is the yellow line)
The yellow curve is not a smooth curve anymore. The only reason I can think of is that Grasshopper rounds off the numbers. RoundingOffProblem3.jpg shows that the graph function in grasshopper has a non smooth curve.
Am I wright that this must be a rounding off problem?
How can I solve this?
Cheers, Bas

Attachments:

Replies to This Discussion

Permalink Reply by Vicente Soler on December 3, 2009 at 11:28am

Have you checked your document's tolerance values? Try adding a few decimal places to the absolute tolerance.

Permalink Reply by Bas Goris on December 3, 2009 at 11:39am

Do you mean document tolerances in Rhino?

Permalink Reply by Vicente Soler on December 3, 2009 at 1:07pm

yep

Permalink Reply by Bas Goris on December 3, 2009 at 1:24pm

I have tried, but it does not change it. See attached screendump.
I think it is in Grasshopper.

Attachments:

RoundingOffProblem4.jpg, 68 KB

Permalink Reply by Vicente Soler on December 3, 2009 at 1:51pm

Can you post your definition?
I tried to recreate something similar, but I'm not able to reproduce the problem:

Attachments:

sincurves.ghx, 102 KB

Permalink Reply by Bas Goris on December 3, 2009 at 1:56pm

mmmm, now I have a problem, as my grasshopper file is confidential.
I will try to rebuild a part of it so I can make this problem public. This might take a while.

Permalink Reply by Vicente Soler on December 3, 2009 at 2:09pm

Sure. Just remove the part that contains evidence of alien life on earth causing global cooling and 9-11, and I'll take a look at it.

Permalink Reply by Bas Goris on December 5, 2009 at 3:21am

You guess that my project is about alien life is quit correct. :) How do you do that?

Permalink Reply by Vicente Soler on December 5, 2009 at 8:58am

Isn't that wavelength the same as the Hydrogen line?

Permalink Reply by Bas Goris on December 6, 2009 at 6:04am

YES! I found the reason. pffff, not easy to find such 'bugs'.
A panel bringing 2 streams together is rounding of the data. See attached file. Cheers Bas

Attachments: