Kahan summation: Difference between revisions

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Kahan summation of a,b,c = 1.00000000000000000000000000000

</pre>

<pre>

decimal digits = 6

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simple summation of a,b,c = 0.999999999999999999999999999997

Kahan summation of a,b,c = 1.00000000000000000000000000000</pre>

{{out|output|text=  using Regina 3.4 and later   (latest at this time is 3.9.1):}}

{{out|output|text=  using Regina version 3.4 and later   (latest at this time is version 3.9.1):}}

<pre>decimal digits = 6

a = 10000.0

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===tweaked version===

The following tweaked REXX version causes Regina (3.4 and later) to work properly.

The following tweaked REXX version causes Regina (version 3.4 and later) to work properly.

<lang rexx>/*REXX program demonstrates simple addition versus using Kahan summation algorithm. */

numeric digits 6 /*use six decimal digits for precision.*/

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say 'Kahan summation of a,b,c = ' kahan(a,b,c) /*sum via Kahan summation. */

return</lang>

{{out|output|text=  using Regina 3.4 and also for later versions:}}

{{out|output|text=  using Regina version 3.4 and also for later versions:}}

<pre>decimal digits = 6

a = 10000.0

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simple summation of a,b,c = 1.0000000000000000000000000000001

Kahan summation of a,b,c = 1.0000000000000000000000000000000</pre>

'''output''' for ooRexx:

<pre>decimal digits = 6

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=={{header|Scala}}==

===IEEE 754 Single precision 32-bit (JavaScript defaults to Double precision.)===