Re: Bug in srfi-48?

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On 12 October 2017 at 15:07, Arthur A. Gleckler <[email protected]> wrote:

> On Thu, Oct 12, 2017 at 6:04 AM, Donald Allen <[email protected]>
> wrote:
>
>
>> Thanks for the quick response. From your description of the patch, it
>> sounds like you addressed the error that occurs using Gambit. But did
>> you also have a look at the odd rounding behavior I reported in my
>> first message?
>>
>
> earlier:
>
> 3> (/ (round (* 1.997554209949891 100)) 100)
>> 2.
>
>
> I get the same result with MIT Scheme.  I must be missing something.  Why
> do you consider it wrong?  According to R7RS (and probably earlier versions
> of the standard),"round returns the closest integer to x, rounding to even
> when x is halfway between two integers."
>

Sorry, I wasn't clear. I was talking about this:

2> (format "~a & ~7,2F\\%\\\\\n" "Framingham Mass Muni Purpose Loan"
1.997554209949891)
"Framingham Mass Muni Purpose Loan &    2.10\\%\\\\\n"

Why does a ~7,2 formatting of something just under 2 result in 2.1? When,
as you say,

3> (/ (round (* 1.997554209949891 100)) 100)
2.

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><div class=3D"gmail_quo=
te">On 12 October 2017 at 15:07, Arthur A. Gleckler <span dir=3D"ltr">&lt;<=
a href=3D"mailto:[email protected]" target=3D"_blank">[email protected]=
</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin=
:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"=
><div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote"><sp=
an class=3D"gmail-">On Thu, Oct 12, 2017 at 6:04 AM, Donald Allen <span dir=
=3D"ltr">&lt;<a href=3D"mailto:[email protected]" target=3D"_blank">do=
[email protected]</a>&gt;</span> wrote:<br><div>=C2=A0</div><blockquote =
class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px sol=
id rgb(204,204,204);padding-left:1ex">
Thanks for the quick response. From your description of the patch, it<br>
sounds like you addressed the error that occurs using Gambit. But did<br>
you also have a look at the odd rounding behavior I reported in my<br>
first message?<br></blockquote><div><br></div></span><div>earlier:</div><sp=
an class=3D"gmail-"><div><br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex"><span style=3D"font-size:12.8px">3&gt; (/ (round (* 1.9975542099=
49891 100)) 100)<br></span><span style=3D"font-size:12.8px">2.</span></bloc=
kquote><div><br></div></span><div>I get the same result with MIT Scheme.=C2=
=A0 I must be missing something.=C2=A0 Why do you consider it wrong?=C2=A0 =
According to R7RS (and probably earlier versions of the standard),&quot;rou=
nd returns the closest integer to x, rounding to even when x is halfway bet=
ween two integers.&quot;<span style=3D"font-size:10pt;font-family:CMR10">=
=C2=A0</span></div></div></div></div></blockquote><div><br></div><div>Sorry=
, I wasn&#39;t clear. I was talking about this:</div><div><br></div><span s=
tyle=3D"font-size:12.8px">2&gt; (format &quot;~a &amp; ~7,2F\\%\\\\\n&quot;=
 &quot;Framingham Mass Muni Purpose Loan&quot; 1.997554209949891)</span><br=
 style=3D"font-size:12.8px"><div><span style=3D"font-size:12.8px">&quot;Fra=
mingham Mass Muni Purpose Loan &amp;=C2=A0=C2=A0=C2=A0 2.10\\%\\\\\n&quot;<=
/span></div><div><br></div><div>Why does a ~7,2 formatting of something jus=
t under 2 result in 2.1? When, as you say,</div><div><br></div><div><span s=
tyle=3D"font-size:12.8px">3&gt; (/ (round (* 1.997554209949891 100)) 100)<b=
r></span><span style=3D"font-size:12.8px">2.</span><br></div><div>=C2=A0</d=
iv></div><br></div></div>

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