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| Guest |
 Posted: Wed Sep 12, 2007 5:53 am |
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Guest
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Hi
I'm a bit worried about the mysql-driver code for the floats. It
contains this code to make a string out of float:
encode(Val, false) when is_float(Val) ->
[Res] = io_lib:format("~w", [Val]),
Res;
Now, my erlang does this
5> B = 4.4345345345.
4.43453
6> float_to_list(B).
"4.43453453450000001368e+00"
7> io_lib:format("~w~n", [B]).
["4.43453","\n"]
Which is also what the manual says, default precision of 6 ... Which
is may work, if you don't do any accounting (which should be done in
integers, I know. But some data may need the precision ...)
Jouni
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| Guest |
| Posted: Fri Sep 14, 2007 5:14 am |
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Guest
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Thanks for reporting. I'll see if the io_lib api allows you to set the
precision (I think it can)
Yariv
On 9/11/07, Joneksi <Jouni.Ryno@gmail.com> wrote:
>
> Hi
>
> I'm a bit worried about the mysql-driver code for the floats. It
> contains this code to make a string out of float:
>
> encode(Val, false) when is_float(Val) ->
> [Res] = io_lib:format("~w", [Val]),
> Res;
>
> Now, my erlang does this
> 5> B = 4.4345345345.
> 4.43453
> 6> float_to_list(B).
> "4.43453453450000001368e+00"
> 7> io_lib:format("~w~n", [B]).
> ["4.43453","\n"]
>
> Which is also what the manual says, default precision of 6 ... Which
> is may work, if you don't do any accounting (which should be done in
> integers, I know. But some data may need the precision ...)
>
>
> Jouni
>
>
> >
>
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| Guest |
| Posted: Sat Sep 15, 2007 5:05 am |
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Guest
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Why not to use float_to_list? It does use the full precision. And as
you use is_float() to check, that parameter is indeed a float.
Jouni
On Sep 14, 8:14 am, "Yariv Sadan" <yarivsa...@gmail.com> wrote:
> Thanks for reporting. I'll see if the io_lib api allows you to set the
> precision (I think it can)
>
> Yariv
>
> On 9/11/07, Joneksi <Jouni.R...@gmail.com> wrote:
>
>
>
> > Hi
>
> > I'm a bit worried about the mysql-driver code for the floats. It
> > contains this code to make a string out of float:
>
> > encode(Val, false) when is_float(Val) ->
> > [Res] = io_lib:format("~w", [Val]),
> > Res;
>
> > Now, my erlang does this
> > 5> B = 4.4345345345.
> > 4.43453
> > 6> float_to_list(B).
> > "4.43453453450000001368e+00"
> > 7> io_lib:format("~w~n", [B]).
> > ["4.43453","\n"]
>
> > Which is also what the manual says, default precision of 6 ... Which
> > is may work, if you don't do any accounting (which should be done in
> > integers, I know. But some data may need the precision ...)
>
> > Jouni
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