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Another possibility, to make the syntax clearer (IMO), because no
confusing nested back-reference, and to make it more clear that
appending lookup table, would be to use the following for 2nd step:
s/(.)(.);.*\1(.*);.*\2(.*)/\3\4 9876543210/
instead of:
s/(.)(.);.*\1(.*);(.*(\2.*))/\3\5\4/
Maybe I am missing something, but my tests indicate the results are
correct either way.
Daniel
On 11/27/2018 11:46 AM, Gilles Arcas [email protected]
[sed-users] wrote:
>
> Hi, I have always been intrigued and fascinated by the addition and subtraction in Greg Ubben's dc. The most amazing is that both operations differ only in the order of the sequences of digits they used (0123456789 or 9876543210).
>
> I have written a details analysis of the construction and working of these snippets here https://github.com/GillesArcas/numsed/blob/master/analysis/Adding_and_subtracting_digits_with_sed.md .
>
> The working can be illustrated with the following picture. Two first columns illustrate two variants for addition, two last are for subtraction.
>
> [addsub.jpg]
>
> Regards.
> Gilles Arcas
>
>
> [Non-text portions of this message have been removed]
>
>
>
> ------------------------------------
> Posted by: Gilles Arcas <[email protected]>
> ------------------------------------
>
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<p>Another possibility, to make the syntax clearer (IMO), because no <br>
confusing nested back-reference, and to make it more clear that <br>
appending lookup table, would be to use the following for 2nd step:<br>
<br>
s/(.)(.);.*\1(.*);.*\2(.*)/\3\4 9876543210/<br>
<br>
instead of:<br>
<br>
s/(.)(.);.*\1(.*);(.*(\2.*))/\3\5\4/<br>
<br>
Maybe I am missing something, but my tests indicate the results are <br>
correct either way.<br>
<br>
Daniel<br>
<br>
On 11/27/2018 11:46 AM, Gilles Arcas [email protected] <br>
[sed-users] wrote:<br>
><br>
> Hi, I have always been intrigued and fascinated by the addition and subtraction in Greg Ubben's dc. The most amazing is that both operations differ only in the order of the sequences of digits they used (0123456789 or 9876543210).<br>
><br>
> I have written a details analysis of the construction and working of these snippets here https://github.com/GillesArcas/numsed/blob/master/analysis/Adding_and_subtracting_digits_with_sed.md .<br>
><br>
> The working can be illustrated with the following picture. Two first columns illustrate two variants for addition, two last are for subtraction.<br>
><br>
> [addsub.jpg]<br>
><br>
> Regards.<br>
> Gilles Arcas<br>
><br>
><br>
> [Non-text portions of this message have been removed]<br>
><br>
><br>
><br>
> ------------------------------------<br>
> Posted by: Gilles Arcas <[email protected]><br>
> ------------------------------------<br>
><br>
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