Re: [Factor-talk] unexpected integer from a float sum
I’m surprised also. They should display the way they do in other languages
examples. That seems like a bug.
> On Dec 18, 2018, at 12:25 PM, Alexander Ilin wrote:
>
> USE: math.functions:round instead
>
> 18.12.2018, 15:14, "Georg Simon" :
>> Below I pasted a result from my listener I do not understand.
>>
>> The result of sum looks like 137.99 which is right.
>> But the integer I made out of it is 13798 which is wrong.
>>
>> A typed in 137.99 gives the result I expect.
>>
>> What am I missing ?
>> --
>> Press F1 at any time for help.
>> Factor 0.99 x86.64 (1889, heads/master-f77d46f0c8, Dec 1 2018 21:02:41)
>> [GCC 7.3.0] on linux
>>
>> IN: scratchpad { -13.8 -21.8 -3.99 -3.0 -15.7 126.98 -8.9 100.0 -21.8 }
>> sum
>>
>> --- Data stack:
>> 137.99
>> IN: scratchpad 100 *
>>
>> --- Data stack:
>> 13799.0
>> IN: scratchpad >integer .
>> 13798
>> IN: scratchpad 137.99 100 * >integer .
>> 13799
>
> ---=---
> Александр
>
>
>
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Re: [Factor-talk] unexpected integer from a float sum
Thank you.
I have not considered that floating point numbers are displayed rounded.
Am Tue, 18 Dec 2018 16:40:21 -0800
schrieb John Benediktsson :
> Your number isn't quite 13799, represented as a floating point
> number, but maybe we could print it out with additional digits. See,
> for example, the same result in other languages:
>
> Here is Java:
>
> $ cat foo.java
> class foo {
>
> public static void main(String[] args) {
> double[] foo = { -13.8, -21.8, -3.99, -3.0, -15.7, 126.98, -8.9,
> 100.0, -21.8 };
>
> double x = 0.0;
> for (int i = 0; i < foo.length; i++) {
> x += foo[i];
> }
> System.out.println(x);
> System.out.println(x*100);
> System.out.println((int)(x*100));
> }
> }
> $ javac foo.java
> $ java foo
> 137.989998
> 13798.9998
> 13798
>
>
> Or Python:
>
> >>> a = [-13.8, -21.8, -3.99, -3.0, -15.7, 126.98, -8.9, 100.0, -21.8]
> >>> sum(a)
> 137.989998
> >>> sum(a) * 100
> 13798.9998
> >>> int(sum(a) * 100)
> 13798
>
>
>
>
> On Tue, Dec 18, 2018 at 12:26 PM Alexander Ilin
> wrote:
>
> > USE: math.functions:round instead
> >
> > 18.12.2018, 15:14, "Georg Simon" :
> > > Below I pasted a result from my listener I do not understand.
> > >
> > > The result of sum looks like 137.99 which is right.
> > > But the integer I made out of it is 13798 which is wrong.
> > >
> > > A typed in 137.99 gives the result I expect.
> > >
> > > What am I missing ?
> > > --
> > > Press F1 at any time for help.
> > > Factor 0.99 x86.64 (1889, heads/master-f77d46f0c8, Dec 1 2018
> > > 21:02:41) [GCC 7.3.0] on linux
> > >
> > > IN: scratchpad { -13.8 -21.8 -3.99 -3.0 -15.7 126.98 -8.9 100.0
> > > -21.8 } sum
> > >
> > > --- Data stack:
> > > 137.99
> > > IN: scratchpad 100 *
> > >
> > > --- Data stack:
> > > 13799.0
> > > IN: scratchpad >integer .
> > > 13798
> > > IN: scratchpad 137.99 100 * >integer .
> > > 13799
> >
> > ---=---
> > Александр
> >
> >
> >
> > ___
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> > https://lists.sourceforge.net/lists/listinfo/factor-talk
> >
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Re: [Factor-talk] unexpected integer from a float sum
Your number isn't quite 13799, represented as a floating point number, but
maybe we could print it out with additional digits. See, for example, the
same result in other languages:
Here is Java:
$ cat foo.java
class foo {
public static void main(String[] args) {
double[] foo = { -13.8, -21.8, -3.99, -3.0, -15.7, 126.98, -8.9, 100.0,
-21.8 };
double x = 0.0;
for (int i = 0; i < foo.length; i++) {
x += foo[i];
}
System.out.println(x);
System.out.println(x*100);
System.out.println((int)(x*100));
}
}
$ javac foo.java
$ java foo
137.989998
13798.9998
13798
Or Python:
>>> a = [-13.8, -21.8, -3.99, -3.0, -15.7, 126.98, -8.9, 100.0, -21.8]
>>> sum(a)
137.989998
>>> sum(a) * 100
13798.9998
>>> int(sum(a) * 100)
13798
On Tue, Dec 18, 2018 at 12:26 PM Alexander Ilin wrote:
> USE: math.functions:round instead
>
> 18.12.2018, 15:14, "Georg Simon" :
> > Below I pasted a result from my listener I do not understand.
> >
> > The result of sum looks like 137.99 which is right.
> > But the integer I made out of it is 13798 which is wrong.
> >
> > A typed in 137.99 gives the result I expect.
> >
> > What am I missing ?
> > --
> > Press F1 at any time for help.
> > Factor 0.99 x86.64 (1889, heads/master-f77d46f0c8, Dec 1 2018 21:02:41)
> > [GCC 7.3.0] on linux
> >
> > IN: scratchpad { -13.8 -21.8 -3.99 -3.0 -15.7 126.98 -8.9 100.0 -21.8 }
> > sum
> >
> > --- Data stack:
> > 137.99
> > IN: scratchpad 100 *
> >
> > --- Data stack:
> > 13799.0
> > IN: scratchpad >integer .
> > 13798
> > IN: scratchpad 137.99 100 * >integer .
> > 13799
>
> ---=---
> Александр
>
>
>
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Re: [Factor-talk] unexpected integer from a float sum
USE: math.functions:round instead
18.12.2018, 15:14, "Georg Simon" :
> Below I pasted a result from my listener I do not understand.
>
> The result of sum looks like 137.99 which is right.
> But the integer I made out of it is 13798 which is wrong.
>
> A typed in 137.99 gives the result I expect.
>
> What am I missing ?
> --
> Press F1 at any time for help.
> Factor 0.99 x86.64 (1889, heads/master-f77d46f0c8, Dec 1 2018 21:02:41)
> [GCC 7.3.0] on linux
>
> IN: scratchpad { -13.8 -21.8 -3.99 -3.0 -15.7 126.98 -8.9 100.0 -21.8 }
> sum
>
> --- Data stack:
> 137.99
> IN: scratchpad 100 *
>
> --- Data stack:
> 13799.0
> IN: scratchpad >integer .
> 13798
> IN: scratchpad 137.99 100 * >integer .
> 13799
---=---
Александр
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