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## Main Question or Discussion Point

Hi,

I'm quite new to Mathematica, and I've been trying to use it to solve some PDE's numerically, and I eventually end up with a really large matrix I have to find the solution for. I was think the calculation would go by faster if I could take the precision of the numbers down. I think its using double and I want it to be floating pt numbers.

I guess by precision I mean the number of digits, after the decimal point. So maybe I mean to say accuracy. In any case, is there a way that I can tell mathematica to only use lets say 5 digits after the decimal point?

I've already read some of the documentation, about using $MaxPrecision, and WorkingPrecision, but it doesn't seem like there is a global way to set the precision. Is there? Can I just say "I want precision 5" somehow and set that for the whole notebook?

Thanks in advanced.

I'm quite new to Mathematica, and I've been trying to use it to solve some PDE's numerically, and I eventually end up with a really large matrix I have to find the solution for. I was think the calculation would go by faster if I could take the precision of the numbers down. I think its using double and I want it to be floating pt numbers.

I guess by precision I mean the number of digits, after the decimal point. So maybe I mean to say accuracy. In any case, is there a way that I can tell mathematica to only use lets say 5 digits after the decimal point?

I've already read some of the documentation, about using $MaxPrecision, and WorkingPrecision, but it doesn't seem like there is a global way to set the precision. Is there? Can I just say "I want precision 5" somehow and set that for the whole notebook?

Thanks in advanced.