RES: [Bioperl-l] Mysql columns and Blast evalues

[Stefan Kirov]

I think it should work OK. And I think the values you want to store are 
too small for float (53 is the smallest: you should use float(53,53), 
which defines both storage and display precision).
I am personally using Oracle so it is a differnt game. One thing you can 
do is store the exponent, even just as an integer:
my $exp=int(log($blast_eval));
or
my $exp=log($blast_eval);
and store it as float.
When you want to work with the number again:
my $blast_eval=1**$exp;
Stefan

davila wrote:

>Hi Stefan,
> 
>Thanks for the tips !
> 
>I guess the problem of using VARCHAR could be the limitations to compare the real evalues, so if I want to do something or only show evalues greater or smaller than 1e-50 would it work ok ?
> 
>I wonder to know what other (mysql) column types (any further details would be appreciated) colleagues are using to store their Blast evalues ?
> 
>Thanks.
> 
> 
>-----Mensagem original----- 
>De: Stefan Kirov [mailto:skirov at utk.edu] 
>Enviada: qui 10/3/2005 00:25 
>Para: davila 
>Cc: bioperl-l at portal.open-bio.org 
>Assunto: Re: [Bioperl-l] Mysql columns and Blast evalues
>
>
> 
>  
>