[I'm picky here because a beginner is at risk. I know that *I* had
troubles using "/" for my first three J years.]
Devon McCormick wrote:
>
> J has a handy adverb called "table" which is the forward slash "/". This
> allows you to apply a function orthogonally, e.g.
> 1 2 3 4 5 +/ 1 2
> adds each number on the left to each on the right,
One might think so but this is not true.
"/" itself is not causing an "each on each".
A better wording is:
"In
1 2 3 4 5 +/ 1 2
each argument cell from the left is individually added to the entire
argument (cell array) on the right, and computation proceeds from there."
That is:
1 2 3 4 5 +/ 1 2
is computed by computing and composing the results of the five expressions
1 + 1 2
2 + 1 2
3 + 1 2
4 + 1 2
5 + 1 2
This in turn will imply loops distributing a left cell across several (two)
right cells. But that is not related to the "/" anymore.
Martin
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