Need unrounded precision

[Kunk]

Hi,

I need to extract the first digit after the decimal point from a number such
as 28.56018, which should be '5'.

I've tried a few methods to accomplish this. If I use 'ini_set' I would need
to know the number of digits before the decimal (which, unfortunately, I
would not have access to).

Then I've tried:

<?php

        $elapsed = 28.56018;

        $digit = round($elapsed, 1); // rounds result is '6'
        $digit = number_format($elapsed, 1); // still rounds result to '6'

?>

What I need is only the first digit after the decimal -- all the rest could
be 'chopped' or discarded but without rounding the first digit after the
decimal point.

Is there any way of doing this?

I'm stumped.

Tia,
Andre

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[Eddie Drapkin]

On Fri, Jan 1, 2010 at 9:20 PM, Andre Dubuc <aajdubuc@...> wrote:

> Hi,
>
> I need to extract the first digit after the decimal point from a number such
> as 28.56018, which should be '5'.
>
> I've tried a few methods to accomplish this. If I use 'ini_set' I would need
> to know the number of digits before the decimal (which, unfortunately, I
> would not have access to).
>
> Then I've tried:
>
> <?php
>
>        $elapsed = 28.56018;
>
>        $digit = round($elapsed, 1); // rounds result is '6'
>        $digit = number_format($elapsed, 1); // still rounds result to '6'
>
> ?>
>
> What I need is only the first digit after the decimal -- all the rest could
> be 'chopped' or discarded but without rounding the first digit after the
> decimal point.
>
> Is there any way of doing this?
>
> I'm stumped.
>
> Tia,
> Andre
>
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>

Try sprintf with a format of %0.1f.

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[Kunk]

Thanks Eddie,

Actually while waiting for some re[lies, I resolved the problem.

I realized that '$elapsed' will always have only two digits before the decimal
point. Thus I was able to use 'number_format($elapsed, 2);' and to give me
the desired result.

Thanks for the quick reply!
Andre



On October 11, 2009 08:50:11 pm Eddie Drapkin wrote:

> On Fri, Jan 1, 2010 at 9:20 PM, Andre Dubuc <aajdubuc@...> wrote:
> > Hi,
> >
> > I need to extract the first digit after the decimal point from a number
> > such as 28.56018, which should be '5'.
> >
> > I've tried a few methods to accomplish this. If I use 'ini_set' I would
> > need to know the number of digits before the decimal (which,
> > unfortunately, I would not have access to).
> >
> > Then I've tried:
> >
> > <?php
> >
> >        $elapsed = 28.56018;
> >
> >        $digit = round($elapsed, 1); // rounds result is '6'
> >        $digit = number_format($elapsed, 1); // still rounds result to '6'
> >
> > ?>
> >
> > What I need is only the first digit after the decimal -- all the rest
> > could be 'chopped' or discarded but without rounding the first digit
> > after the decimal point.
> >
> > Is there any way of doing this?
> >
> > I'm stumped.
> >
> > Tia,
> > Andre
> >
> > --
> > PHP General Mailing List (http://www.php.net/)
> > To unsubscribe, visit: http://www.php.net/unsub.php
>
> Try sprintf with a format of %0.1f.

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[Jim Lucas-2]

Andre Dubuc wrote:

> Hi,
>
> I need to extract the first digit after the decimal point from a number such
> as 28.56018, which should be '5'.
>
> I've tried a few methods to accomplish this. If I use 'ini_set' I would need
> to know the number of digits before the decimal (which, unfortunately, I
> would not have access to).
>
> Then I've tried:
>
> <?php
>
> $elapsed = 28.56018;
>
> $digit = round($elapsed, 1); // rounds result is '6'
> $digit = number_format($elapsed, 1); // still rounds result to '6'
>
> ?>
>
> What I need is only the first digit after the decimal -- all the rest could
> be 'chopped' or discarded but without rounding the first digit after the
> decimal point.
>
> Is there any way of doing this?
>
> I'm stumped.
>
> Tia,
> Andre
>

FYI: did you know that your computer thinks it is in the future?

You need to check your date settings...

--
Jim Lucas

    "Some men are born to greatness, some achieve greatness,
        and some have greatness thrust upon them."

Twelfth Night, Act II, Scene V
     by William Shakespeare

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[Kunk]

Yup! I had noticed that I had forgot to reset to today's date after working on
the code, just after I sent the messages.

Thanks.
Andre



On October 11, 2009 09:14:56 pm Jim Lucas wrote:

> Andre Dubuc wrote:
> > Hi,
> >
> > I need to extract the first digit after the decimal point from a number
> > such as 28.56018, which should be '5'.
> >
> > I've tried a few methods to accomplish this. If I use 'ini_set' I would
> > need to know the number of digits before the decimal (which,
> > unfortunately, I would not have access to).
> >
> > Then I've tried:
> >
> > <?php
> >
> > $elapsed = 28.56018;
> >
> > $digit = round($elapsed, 1); // rounds result is '6'
> > $digit = number_format($elapsed, 1); // still rounds result to '6'
> >
> > ?>
> >
> > What I need is only the first digit after the decimal -- all the rest
> > could be 'chopped' or discarded but without rounding the first digit
> > after the decimal point.
> >
> > Is there any way of doing this?
> >
> > I'm stumped.
> >
> > Tia,
> > Andre
>
> FYI: did you know that your computer thinks it is in the future?
>
> You need to check your date settings...
>
> --
> Jim Lucas
>
>     "Some men are born to greatness, some achieve greatness,
>         and some have greatness thrust upon them."
>
> Twelfth Night, Act II, Scene V
>      by William Shakespeare

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[Arno Kuhl]

-----Original Message-----
From: Andre Dubuc [mailto:aajdubuc@...]
Sent: 02 January 2010 03:20 AM
To: php-general@...
Subject: [PHP] Need unrounded precision

Hi,

I need to extract the first digit after the decimal point from a number such
as 28.56018, which should be '5'.

I've tried a few methods to accomplish this. If I use 'ini_set' I would need
to know the number of digits before the decimal (which, unfortunately, I
would not have access to).

Then I've tried:

<?php

        $elapsed = 28.56018;

        $digit = round($elapsed, 1); // rounds result is '6'
        $digit = number_format($elapsed, 1); // still rounds result to '6'

?>

What I need is only the first digit after the decimal -- all the rest could
be 'chopped' or discarded but without rounding the first digit after the
decimal point.

Is there any way of doing this?

I'm stumped.

Tia,
Andre

--

One way that should work regardless the number of digits before/after the
decimal is:
- convert to string (sprintf or typecast)
- strpos the decimal
- grab the char from the next position

Cheers
Arno


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[Chetan Rane-3]

May be this will work
$elapsed = 28.56018;
$elapsed_rel = (int) 28.56018;
$elapsed_deci = $elapsed - $elapsed_rel;
$deci = ((int) ($elapsed_deci * 10))/10;
$final = $elapsed_rel + $deci;


With regards,

Chetan Dattaram Rane | Software Engineer | Persistent Systems
chetan_rane@...  | Cell: [phone] | Tel: [phone]
Innovation in software product design, development and delivery- www.persistentsys.com


-----Original Message-----
From: Arno Kuhl [mailto:akuhl@...]
Sent: Monday, October 12, 2009 12:07 PM
To: 'Andre Dubuc'; php-general@...
Subject: RE: [PHP] Need unrounded precision

-----Original Message-----
From: Andre Dubuc [mailto:aajdubuc@...]
Sent: 02 January 2010 03:20 AM
To: php-general@...
Subject: [PHP] Need unrounded precision

Hi,

I need to extract the first digit after the decimal point from a number such
as 28.56018, which should be '5'.

I've tried a few methods to accomplish this. If I use 'ini_set' I would need
to know the number of digits before the decimal (which, unfortunately, I
would not have access to).

Then I've tried:

<?php

        $elapsed = 28.56018;

        $digit = round($elapsed, 1); // rounds result is '6'
        $digit = number_format($elapsed, 1); // still rounds result to '6'

?>

What I need is only the first digit after the decimal -- all the rest could
be 'chopped' or discarded but without rounding the first digit after the
decimal point.

Is there any way of doing this?

I'm stumped.

Tia,
Andre

--

One way that should work regardless the number of digits before/after the
decimal is:
- convert to string (sprintf or typecast)
- strpos the decimal
- grab the char from the next position

Cheers
Arno


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[Diogo Neves]

A simple way to do that would be:

$elapsed = strval( 28.56018 );
$pos = strpos( $elapsed, '.' );
echo $elapsed[ ++$pos ];

On Sat, Jan 2, 2010 at 2:20 AM, Andre Dubuc <aajdubuc@...> wrote:

> Hi,
>
> I need to extract the first digit after the decimal point from a number
> such
> as 28.56018, which should be '5'.
>
> I've tried a few methods to accomplish this. If I use 'ini_set' I would
> need
> to know the number of digits before the decimal (which, unfortunately, I
> would not have access to).
>
> Then I've tried:
>
> <?php
>
>        $elapsed = 28.56018;
>
>        $digit = round($elapsed, 1); // rounds result is '6'
>        $digit = number_format($elapsed, 1); // still rounds result to '6'
>
> ?>
>
> What I need is only the first digit after the decimal -- all the rest could
> be 'chopped' or discarded but without rounding the first digit after the
> decimal point.
>
> Is there any way of doing this?
>
> I'm stumped.
>
> Tia,
> Andre
>
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>

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Thanks,

Diogo Neves
Web Developer @ SAPO.pt by PrimeIT.pt

[Jaime Bozza-2]

> -----Original Message-----
> From: Diogo Neves [mailto:dafneves@...]
> Sent: Monday, October 12, 2009 9:19 AM
> To: Andre Dubuc
> Cc: php-general@...
> Subject: Re: [PHP] Need unrounded precision
>
> A simple way to do that would be:
>
> $elapsed = strval( 28.56018 );
> $pos = strpos( $elapsed, '.' );
> echo $elapsed[ ++$pos ];
>
> On Sat, Jan 2, 2010 at 2:20 AM, Andre Dubuc <aajdubuc@...>
> wrote:
>
> > Hi,
> >
> > I need to extract the first digit after the decimal point from a
> number
> > such
> > as 28.56018, which should be '5'.

Couldn't this be done with just simple math functions?


$a = 28.56018;
$b = intval(($a*10)-(intval($a)*10));

or:

$a = 28.56018;
$b = intval(($a-intval($a))*10);


Jaime


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[Andrea Giammarchi-3]

> Couldn't this be done with just simple math functions?

indeed:

$a = 28.56018;
$b = $a * 10 % 10 >> 0;

Regards
     
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[Jaime Bozza-2]

>> Couldn't this be done with just simple math functions?
>
>indeed:
>
>$a = 28.56018;
>$b = $a * 10 % 10 >> 0;

Hmmm...   Didn't think about this, but % only works with int values, so

$b = $a * 10 % 10;

Should work as well.

Jaime


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[Andrea Giammarchi-3]

> Hmmm...   Didn't think about this, but % only works with int values

it was just future prof precaution since this statement is false for many other languages.
In few words I am not sure PHP6 does the same ... never mind so far

Regards
     
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[Jaime Bozza-2]

>> Hmmm... Didn't think about this, but % only works with int values
>
>it was just future prof precaution since this statement is false for many other languages.
>In few words I am not sure PHP6 does the same ... never mind so far

Good to know.  In that case, I would probably just use intval() instead of >> since it's clearer and bitwise shifts aren't necessarily integer only either.

Jaime


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[Andrea Giammarchi-3]

bitwise right shift is probably the fastest cast to int so far ... still in many languages, intval is a function call

being a cast in both cases (int) is good as well ... bitwise, casting, works with strings, arrays, boolean, whatever as well.

I don't think there is any difference in php, except when the integer is "too big" ... but this was not the case, we had to deal with 1 to 10 :-)

Regards

> From: jbozza@...
> To: an_red@...
> CC: php-general@...
> Date: Mon, 12 Oct 2009 11:33:10 -0500
> Subject: RE: [PHP] Need unrounded precision
>
> >> Hmmm... Didn't think about this, but % only works with int values
> >
> >it was just future prof precaution since this statement is false for many other languages.
> >In few words I am not sure PHP6 does the same ... never mind so far
>
> Good to know.  In that case, I would probably just use intval() instead of >> since it's clearer and bitwise shifts aren't necessarily integer only either.
>
> Jaime
>

     
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[Philip Thompson-4]

On Oct 12, 2009, at 2:37 PM, Andrea Giammarchi wrote:

> bitwise right shift is probably the fastest cast to int so far ...  
> still in many languages, intval is a function call
>
> being a cast in both cases (int) is good as well ... bitwise,  
> casting, works with strings, arrays, boolean, whatever as well.
>
> I don't think there is any difference in php, except when the  
> integer is "too big" ... but this was not the case, we had to deal  
> with 1 to 10 :-)
>
> Regards
>
>> From: jbozza@...
>> To: an_red@...
>> CC: php-general@...
>> Date: Mon, 12 Oct 2009 11:33:10 -0500
>> Subject: RE: [PHP] Need unrounded precision
>>
>>>> Hmmm... Didn't think about this, but % only works with int values
>>>
>>> it was just future prof precaution since this statement is false  
>>> for many other languages.
>>> In few words I am not sure PHP6 does the same ... never mind so far
>>
>> Good to know.  In that case, I would probably just use intval()  
>> instead of >> since it's clearer and bitwise shifts aren't  
>> necessarily integer only either.
>>
>> Jaime

I like the bitwise shifting, but here's another potential (albeit  
probably slower) solution.

$a = 28.56018;
list (,$dec) = explode ('.', $a);
$b = $dec{0};

Cheers,
~Philip

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[Kim Madsen-3]

Hello

Andre Dubuc wrote on 2010-01-02 02:20:
> Hi,
>
> I need to extract the first digit after the decimal point from a number such
> as 28.56018, which should be '5'.

Since no one came up with the simple solution:

$num = "28.56018";
ereg("^[0-9]+\.([0-9]){1}", trim($num), $regs);
if($regs[1])
   $digit = $regs[1];
else
   print "no digit found";

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Kim Emax


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[Matthew McKay-2]

Kim Madsen wrote:

> Hello
>
> Andre Dubuc wrote on 2010-01-02 02:20:
>> Hi,
>>
>> I need to extract the first digit after the decimal point from a
>> number such as 28.56018, which should be '5'.
>
> Since no one came up with the simple solution:
>
> $num = "28.56018";
> ereg("^[0-9]+\.([0-9]){1}", trim($num), $regs);
> if($regs[1])
>   $digit = $regs[1];
> else
>   print "no digit found";
>

My submission for a "simple" solution. I wish I had xslt2 =(
<xsl:template name="firstDigit">
    <xsl:param name="number"/>
    <xsl:value-of
select="number(substring(substring-after(number(translate(normalize-space($number),translate(normalize-space($number),'.0123456789',''),'')),'.'),1,1))"/>
</xsl:template>


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[Nathan Rixham]

Matthew McKay wrote:

> Kim Madsen wrote:
>> Hello
>>
>> Andre Dubuc wrote on 2010-01-02 02:20:
>>> Hi,
>>>
>>> I need to extract the first digit after the decimal point from a
>>> number such as 28.56018, which should be '5'.
>>
>> Since no one came up with the simple solution:
>>
>> $num = "28.56018";
>> ereg("^[0-9]+\.([0-9]){1}", trim($num), $regs);
>> if($regs[1])
>>   $digit = $regs[1];
>> else
>>   print "no digit found";
>>
> My submission for a "simple" solution. I wish I had xslt2 =(
> <xsl:template name="firstDigit">
>    <xsl:param name="number"/>
>    <xsl:value-of
> select="number(substring(substring-after(number(translate(normalize-space($number),translate(normalize-space($number),'.0123456789',''),'')),'.'),1,1))"/>
>
> </xsl:template>
>

nice to see a bit of xslt w/ functions :) just for the hell of it here's
one off the top of my head

$num = 28.56018;
substr((int)($num*10) , -1); #5

and one without any functions..

(int)(($num-(int)$num)*10); #5




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