I don't know how to help you with trace mode, but I
can describe what happens with the phrase you are
working at understanding:
/:1{|:ds
The synonym for this that would normally be written
is:
/:1{"1 ds
This may be read so:
Sort by column one of ds.
The transposition in your phrase (|:) makes your
phrasing so:
Sort by row one from the array that results from
transposition of axes of ds.
Written in an interlinear style:
Sort (by row) one from (the array that results from)
/: 1 {
the transposition of axes of ds.
|: ds
The (transposed) array referred to is:
|:ds
+---------+--------+---------+
|Harry |Jane |Peter |
+---------+--------+---------+
|Potter |Eyre |Rabbit |
+---------+--------+---------+
|1998 |1847 |1904 |
+---------+--------+---------+
|childrens|classics|childrens|
+---------+--------+---------+
Note: "By row" is implied by the natural ordering of
axes in J.
Hope this helps,
Tracy
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