diff options
Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 32 |
1 files changed, 23 insertions, 9 deletions
@@ -28702,31 +28702,32 @@ the leftmost one is reported. See the notes under .code pos-max regarding duplicate maxima. -.coNP Functions @, uni @ isec and @ diff +.coNP Functions @, uni @, isec @ diff and @ symdiff .synb .mets (uni < seq1 < seq2 >> [ testfun <> [ keyfun ]]) .mets (isec < seq1 < seq2 >> [ testfun <> [ keyfun ]]) .mets (diff < seq1 < seq2 >> [ testfun <> [ keyfun ]]) +.mets (symdiff < seq1 < seq2 >> [ testfun <> [ keyfun ]]) .syne .desc The functions -.codn diff , -.code isec +.codn uni , +.codn isec , +.code diff and -.code uni -treats the sequences +.code symdiff +treat the sequences .meta seq1 and .meta seq2 as if they were sets. -They respectively compute the set union, set intersection -and set difference of +They, respectively, compute the set union, set intersection, +set difference and symmetric difference of .meta seq1 and .metn seq2 , -returning a new sequence: the union sequence, -intersection sequence and difference sequence. +returning a new sequence. The arguments .meta seq1 @@ -28807,6 +28808,19 @@ If an element occurs at least once in .metn seq2 , then it does not occur in the difference sequence. +The symmetric difference sequence produced by +.code symdiff +contains all of the elements of +.meta seq1 +which do not occur in +.meta seq2 +and +.IR "vice versa" : +it also contains all of the elements of +.meta seq2 +which do not occur in +.metn seq1 . + Element equivalence is determined by a combination of .meta testfun and |