Eval component not outputting a floating double number

I think I'm seeing a situation in when the expression component has floating double numbers for the inputs, but outputs a single number. In the attache example it causes an out of range error in the evaluate curve component.

Take a look at the values in branch 6; the source numbers in branch 6 are floating doubles. However, once it exits from the eval component the result seems to be a single.

I thought all computations / results coming out of the expression component are floating doubles; is there something wrong I have in the formula?

Attachments:

Double Math Error.gh, 10 KB

Replies to This Discussion

Permalink Reply by nikos tzar on September 28, 2014 at 12:28pm

Hello Norm,

I believe this has to do with the number of decimal places displayed.

So the two numbers on your final list that are supposed to be 0 and 1 are actually -0.something and 1.something.

If you round all the numbers from your initial list to, let's say, 6 decimal places it should work ok.

(to round them use the expression "Round(x,6)"):

Permalink Reply by Norm Sash on September 28, 2014 at 12:41pm

Hi Nikos... thanks for the suggestion. I just tried it (although not in the exact way that you mention.) What I want is the expression component (not the expression parameter modifier) to return a floating double (12 decimals). I tried entering "Round((.5-(y-x))/2,12)" but that still didn't work - it maxes out at 6 decimals.

Permalink Reply by nikos tzar on September 28, 2014 at 2:59pm

Hi Norm,

6 decimals is the standard panel display but the extra digits are still there.

The problem is that if you don't round the numbers to a couple of decimal places, then the 0 and 1 will still give you troubles...

Anyway, I was recently referred to these discussions:

http://www.grasshopper3d.com/forum/topics/equality-in-function-does...
http://www.grasshopper3d.com/forum/topics/create-set-not-working

I think they help to clear things up.

cheers

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