R help - Feb 2013 - How to menage decimals in order to obtain accurate estimates

Hi,

I'm trying to calculate some functions loop, unfortunately my data are
decimal numbers that not allow me to get an accurate estimate. I do not want
to use neither "round "nor "signif" but I would prefer to
have all the
information available, (the function loop is generic so you should adapt to
all data, not just those in particular). The approximation error is
multiplied in subsequent operations (I calculate the median and then the mad
and so on...) and so eg. instead of getting 1.000 I get 1.0003.

I saw that there is a package Rmpfr but I have problems loading the package
gmp also I do not know how to use it.

thanks



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On 02/06/2013 10:40 AM, mary wrote:
> Hi,
>
> I'm trying to calculate some functions loop, unfortunately my data are
> decimal numbers that not allow me to get an accurate estimate. I do not
want
> to use neither "round "nor "signif" but I would prefer
to have all the
> information available, (the function loop is generic so you should adapt to
> all data, not just those in particular). The approximation error is
> multiplied in subsequent operations (I calculate the median and then the
mad
> and so on...) and so eg. instead of getting 1.000 I get 1.0003.
>
> I saw that there is a package Rmpfr but I have problems loading the package
> gmp also I do not know how to use it.
>
Hi mary,
It's a bit difficult to understand what you are trying to do. It looks 
like the "machine precision" problem (FAQ 7.31), especially since you 
have mentioned the gmp package. Installing the gmp package requires that 
you have a compiler, is this the problem?

Jim