I have this script performing a calculation on a page on my site:
<script language="JavaS cript">
function compute_weight( form)
{
var weight = form.wt.value;
var pgs = form.pgs.value;
var ppi = form.ppi.value;
var hite = form.ht.value;
if (weight > 0.0) {
form.totwid.val ue = int_zero( weight * 2 )+(pgs/ppi)+0.5;
form.totht.valu e = int_zero( hite )+ 0.5;
form.spine.valu e = int_zero( pgs)/ (ppi);
form.hite1.valu e = int_zero(hite);
form.hite2.valu e = int_zero(hite);
form.wid1.value = int_zero(weight );
form.wid2.value = int_zero(weight );
form.spinetype. value = int_zero( pgs)/ (ppi) -.125;
}
}
// Function to return 0 if result is <1
function int_zero(x)
{
if ( x < 1 )
return 0 ;
else
return parseInt( x ,10 );
}
</script>
At times, depending on the values entereed into my form, I can end up with a
number like 13.011945392491 468. 15 decimal places is just too confusing.
Is there a way I can round this to 3? Or even better, is there away to make
this value appear as a fraction? If you need more code from the page, it's
at www.integratedbook.com/pbkcalc.html. Thanks for your help.
--
Jason
Remove nospam for email replies 8 4333
Schklerg wrote on 25 Nov 2003: I have this script performing a calculation on a page on my site: <script language="JavaS cript">
You must specify the type attribute (type="text/javascript") in the
SCRIPT element. Type is sufficient and language is not needed.
function compute_weight( form) { var weight = form.wt.value;
Using the elements collection is more cross-browser compatible:
var = weight = form.elements['wt'].value;
<snip>
At times, depending on the values entereed into my form, I can end up with a number like 13.011945392491 468. 15 decimal places is just too confusing. Is there a way I can round this to 3? Or even better, is there away to make this value appear as a fraction?
You could do this to round to 3dp:
number *= 1000; // 13.011945392491 468 -> 13011.945392491 468
number = Math.round( number ); // 13011.945392491 468 -> 13012.0
number /= 1000; // 13012.0 -> 13.012
or
number = Math.round( number * 1000 ) / 1000;
Displaying a fraction is much more difficult. After looking at your
site, I don't think it would be particularly appropriate, either.
Mike
--
Michael Winter M.******@blueyo nder.co.uk.invalid (remove ".invalid" to reply)
Michael Winter wrote: Schklerg wrote on 25 Nov 2003:
I have this script performing a calculation on a page on my site: <script language="JavaS cript">
You must specify the type attribute (type="text/javascript") in the SCRIPT element. Type is sufficient and language is not needed.
function compute_weight( form) { var weight = form.wt.value;
Using the elements collection is more cross-browser compatible:
var = weight = form.elements['wt'].value;
<snip>
At times, depending on the values entereed into my form, I can end up with a number like 13.011945392491 468. 15 decimal places is just too confusing. Is there a way I can round this to 3? Or even better, is there away to make this value appear as a fraction?
You could do this to round to 3dp:
number *= 1000; // 13.011945392491 468 -> 13011.945392491 468 number = Math.round( number ); // 13011.945392491 468 -> 13012.0 number /= 1000; // 13012.0 -> 13.012
or
number = Math.round( number * 1000 ) / 1000;
or use toPrecision method which involves only 1 call, 1 line:
"toPrecisio n
Returns a string representing the Number object to the specified precision.
" http://devedge.netscape.com/library/...r.html#1201389
Also, you may want to look at toFixed http://devedge.netscape.com/library/...r.html#1200964
DU
On Tue, 25 Nov 2003 08:25:54 -0500, "Schklerg"
<ja**********@i ntegratedbook.c om> wrote: I have this script performing a calculation on a page on my site:
[cut]At times, depending on the values entereed into my form, I can end up with a number like 13.011945392491 468. 15 decimal places is just too confusing. Is there a way I can round this to 3? Or even better, is there away to make this value appear as a fraction?
Fractions? Well... depends on your numbers and the precision required.
Your 13.011945392491 468 is "close enough" approximated by 7625 / 586.
Now, whether that's good enough for you,
or, maybe, the numbers are "too large" already?
Anyway, you may want to have a look at this:
function q(n)
{
var x = n;
var a = Math.floor(n);
var p0 = 1;
var q0 = 0;
var p1 = a;
var q1 = 1;
var p2 = p1;
var q2 = q1;
while(x - a && Math.abs(n - p2 / q2) > 1e-10)
{
x = 1 / (x - a);
a = Math.floor(x);
p2 = a * p1 + p0;
q2 = a * q1 + q0;
p0 = p1;
q0 = q1;
p1 = p2;
q1 = q2;
}
return p2 + " / " + q2;
}
Should return a fractional "string" of anything you might want
to throw at it :)
Constructive comments welcome.
Yours
P
On Tue, 25 Nov 2003 15:54:55 +0100
PatD <do*****@pt.l u> wrote:
I've personally always suffered from math phobia. But, somewhat OT, are
there good reasons for using only rational numbers in a given
calculation? I remember that the first versions of Smalltalk had only
rationals builtin.
--
Then there was the man who drowned crossing a stream with an average
depth of six inches.
-- W. I. E. Gates
Thanks. That's just what I needed.
--
Jason
Remove nospam for email replies
"DU" <dr*******@hotW IPETHISmail.com > wrote in message
news:bp******** **@news.eusc.in ter.net... Michael Winter wrote: Schklerg wrote on 25 Nov 2003:
I have this script performing a calculation on a page on my site: <script language="JavaS cript">
You must specify the type attribute (type="text/javascript") in the SCRIPT element. Type is sufficient and language is not needed.
function compute_weight( form) { var weight = form.wt.value;
Using the elements collection is more cross-browser compatible:
var = weight = form.elements['wt'].value;
<snip>
At times, depending on the values entereed into my form, I can end up with a number like 13.011945392491 468. 15 decimal places is just too confusing. Is there a way I can round this to 3? Or even better, is there away to make this value appear as a fraction?
You could do this to round to 3dp:
number *= 1000; // 13.011945392491 468 -> 13011.945392491 468 number = Math.round( number ); // 13011.945392491 468 -> 13012.0 number /= 1000; // 13012.0 -> 13.012
or
number = Math.round( number * 1000 ) / 1000;
or use toPrecision method which involves only 1 call, 1 line:
"toPrecisio n
Returns a string representing the Number object to the specified
precision. " http://devedge.netscape.com/library/...r.html#1201389 Also, you may want to look at toFixed http://devedge.netscape.com/library/...r.html#1200964
DU
JRS: In article <Xn************ *************** ****@193.38.113 .46>, seen
in news:comp.lang. javascript, Michael Winter <M.******@bluey onder.co.uk.
invalid> posted at Tue, 25 Nov 2003 13:47:14 :- You could do this to round to 3dp:
number *= 1000; // 13.011945392491 468 -> 13011.945392491 468 number = Math.round( number ); // 13011.945392491 468 -> 13012.0 number /= 1000; // 13012.0 -> 13.012
or
number = Math.round( number * 1000 ) / 1000;
Those round to a multiple of 0.001, which is not exactly the same thing
as rounding to three decimal places.
The OP is clearly outputting the number for eyeball input, in other
words to a string. One-and-a-tenth, rounded to a multiple of 0.001, is a
number of value (close to) 1.1; but, as a string to three decimal
places, it must be "1.100".
FAQ, section 4.6,
and <URL:http://www.merlyn.demo n.co.uk/js-round.htm>
Note : toFixed and toPrecision are not available in all Web browsers,
and toFixed (at least) has bugs.
--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 IE 4 ©
<URL:http://jibbering.com/faq/> Jim Ley's FAQ for news:comp.lang. javascript
<URL:http://www.merlyn.demo n.co.uk/js-index.htm> JS maths, dates, sources.
<URL:http://www.merlyn.demo n.co.uk/> TP/BP/Delphi/JS/&c., FAQ topics, links.
Albert Wagner <al******@tcac. net> wrote in message news:<200311251 00619.505ef6e1. al******@tcac.n et>... On Tue, 25 Nov 2003 15:54:55 +0100 PatD <do*****@pt.l u> wrote: I've personally always suffered from math phobia. But, somewhat OT, are there good reasons for using only rational numbers in a given calculation? I remember that the first versions of Smalltalk had only rationals builtin.
Don't know for the "good" reasons, but, as an example,
0.1428571428571 4285 might talk to you, it doesn't to me.
"1 / 7" however is clearer... YMMV :)
Yours
P
PatD wrote: Albert Wagner <al******@tcac. net> wrote in message news:<200311251 00619.505ef6e1. al******@tcac.n et>...
On Tue, 25 Nov 2003 15:54:55 +0100 PatD <do*****@pt.l u> wrote: I've personally always suffered from math phobia. But, somewhat OT, are there good reasons for using only rational numbers in a given calculation ? I remember that the first versions of Smalltalk had only rationals builtin.
Don't know for the "good" reasons, but, as an example, 0.142857142857 14285 might talk to you, it doesn't to me. "1 / 7" however is clearer... YMMV :) Yours P
This works for me:
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