1. To debug a sentence, use Dissect.
2. To print expressions during execution, a quick way is
load'printf' NB. just once per session
qprintf'x '
qprintf'x $y '
The last character of the argument is the delimiter between expressions.
Henry Rich
On 1/27/2022 8:23 AM, Pawel Jakubas wrote:
Dear J enthusiasts,
I am defining `x repeat y` function, that is appending y to itself x times.
And defined something like below (on intention like that to ask a couple of
questions).
f=: 4 : 0
assert (x < 10)
segment=.>0{y
if. (x = 1) do. (>1{y) else. (x-1) f (segment;( (>1{y),segment) ) end.
)
d
1 2 3
1 f (d;d)
1 2 3
2 f (d;d)
1 2 3 1 2 3
3 f (d;d)
1 2 3 1 2 3 1 2 3
1. Is there a way to customize assert message. So instead of
11 f (d;d)
|assertion failure: assert
| assert(x<10)
have for example message "only x less than 10 is accepted"
2. How to introduce debugs? For example I would like to print x as f
executes
3. Do we have by the way `repeat` in J as I try to define?
4. I intentionally defined f like above as it needs (d;d) as y. Let's
assume I want higher level `repeat` dyad that is
x repeat d
and
defines inside `f` dyad as above and calls it
x f (d;d)
What are good practices to to separate x,y from repeat and not to mix them
in the defined function f (ie. have them decoupled).
Thanks in advance and cheers,
Pawel
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