[etoys-dev] Re: Need more decimal places (more than 10)

Bert Freudenberg bert at freudenbergs.de
Thu Jul 16 20:24:02 EDT 2009

On 16.07.2009, at 23:48, USeITWes wrote:

> I was in hurry with the post above, so I kept it brief. I apologize  
> for being unclear, but now I can elaborate. The member in question  
> is using the read out from a pH probe that gives a measurement which  
> is alway between 0 (acid) and 14 (base) which gives 7 digits of  
> precision. He then tried to create a script to calculate the  
> concentration of hydrogen ions [H+]. The formula to calculate that  
> is 10^-pH = [H+]. For a substance that is extremely basic, say a  
> 12.6 on the pH scale, that would result in a concentration of  
> 0.000000000000251. He attempted to use that result in another script  
> and another equation and received a divide-by-zero exception.
> I hope that clears up any confusion. Thanks for the prompt response  
> Mr. Cherlin. I will try your solution immediately.

The precision setting only affects the display. However, for some  
properties there is some rounding going on. Can you provide the script  
that failed?

- Bert -

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