Using Math.pow(100000 00,10) or Math.pow(10000* 1000,10) returns:
9.9999999999999 99e+69 (Mozilla 0.8)
1e+70 (Opera 8 & Explorer 6)
Is this a Mozilla bug? Ten million is a power of ten, isn't it?
4  1988 
Tony said:
Using Math.pow(100000 00,10) or Math.pow(10000* 1000,10) returns:
9.9999999999999 99e+69 (Mozilla 0.8)
1e+70 (Opera 8 & Explorer 6)
Is this a Mozilla bug? Ten million is a power of ten, isn't it?
A bug? Do you realize how small the percentage difference is?
The two values are identical for all practical purposes.
Tony said the following on 9/29/2005 9:25 PM: Using Math.pow(100000 00,10) or Math.pow(10000* 1000,10) returns:
9.9999999999999 99e+69 (Mozilla 0.8)
1e+70 (Opera 8 & Explorer 6)
Is this a Mozilla bug?
No.
Ten million is a power of ten, isn't it?
Yes. But, computers do not do calculations in base 10. They do it in
floating point base 2 math. Convert to base 2, do calculations, convert
back to base 10.
What you are seeing is a difference in implementation, not a bug.
--
Randy
comp.lang.javas cript FAQ - http://jibbering.com/faq
Tony wrote: Using Math.pow(100000 00,10) or Math.pow(10000* 1000,10) returns:
9.9999999999999 99e+69 (Mozilla 0.8)
1e+70 (Opera 8 & Explorer 6)
Is this a Mozilla bug? Ten million is a power of ten, isn't it?
Pretty much every number can be expressed as a power of 10, logarithms
wouldn't be very useful otherwise. :-)
You may find this useful:
<URL:http://www.merlyn.demo n.co.uk/js-maths.htm#Float >
--
Rob
JRS: In article <11************ *********@z14g2 000cwz.googlegr oups.com>,
dated Thu, 29 Sep 2005 18:25:19, seen in news:comp.lang. javascript, Tony
<an************ @yahoo.co.uk> posted : Using Math.pow(100000 00,10) or Math.pow(10000* 1000,10) returns:
9.9999999999999 99e+69 (Mozilla 0.8)
1e+70 (Opera 8 & Explorer 6)
Is this a Mozilla bug? Ten million is a power of ten, isn't it?
I can think of three ways of implementing Math.pow(X, N) for integer N :
The method used for Math.pow(X, Y) for non-integer Y
Squaring A and halving N until N=0
Multiplying 1 by A, N times
They are likely to give different rounding errors.
A smart implementer will consider both accuracy and speed in choosing a
method; but not all implementers are smart.
Calculations in which all intermediates and results are integers of
magnitude <= 2^53 should be exact; others should be expected to be
approximated.
--
© John Stockton, Surrey, UK. ?@merlyn.demon. co.uk Turnpike v4.00 IE 4 ©
<URL:http://www.jibbering.c om/faq/> JL/RC: FAQ of news:comp.lang. javascript
<URL:http://www.merlyn.demo n.co.uk/js-index.htm> jscr maths, dates, sources.
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