If you are timing, note that string search using E. is much faster in
the new 9.02 beta.
Henry Rich
On 6/23/2020 11:42 AM, Paul Jackson wrote:
I just wanted to be sure the error wasn't because of a bug. Thanks for
suggesting rplc. I was using it before I wrote my own. I did it more to
learn J than for performance, but your comment got me to writing some
timing tests. It was nice to learn how much faster the loop free code is.
Finding loop free code is a game I've been playing since I learned APL in
1969, but it definitely isn't always faster. I hadn't timed my approach
before I included code from nosindx, so I can't be sure which parts matter.
The two approaches are much closer in performance when there are multiple
transformations. I had a contrived example that made several changes
intended to get back to the original. It took me a while to realize that
rplc looks for all the targets in the original before doing the
replacements. That made rplc appear faster until I realized it wasn't
applying all the changes and not getting the result I was expecting. So
I've eliminated tests where the two have different objectives.
Paul
On Sat, Jun 20, 2020, 6:25 PM Raul Miller <[email protected]> wrote:
This is a consequence of the changed meaning of x m}y for rank 2 m.
The fix is to ravel each of the m arguments for } in that definition,
For example:
case. 1 do. (0 (,j+/(#q)+i.d)}1$~#x) # q (,k)}x
That said, note also:
'this a is a a test' rplc ' a ';''
thisisa test
--
Raul
On Sat, Jun 20, 2020 at 6:52 PM Paul Jackson <[email protected]> wrote:
I just thought to look for a published solution to non looping handling
of
overlaps returned by E. in this link:
https://code.jsoftware.com/wiki/Essays/Substring_Replacement
While nosindx works and gives me what I really wanted, the calling verb
replace fails for all three parts of the case statement.
'this a is a a test' replace ' a ';''
|index error: replace
| (0(j+/(#q)+i.d)}1$~#x)#q k}x
I had just updated to the latest release before I began testing.
JVERSION
Engine: j901/j64/android
Release-f: commercial/2020-06-12T10:01:40
Library: 9.01.24
J Android: 1.4.09/9/28
Platform: Android 64 (arm64-v8a)
Installer: unknown
InstallPath:
/storage/emulated/0/Android/data/com.jsoftware.j.android/files
Contact: www.jsoftware.com
I've confirmed it works in Windows, which I seldom update. So I'm not
sure
this is release or platform related.
Engine: j805/j64/windows
Beta-14: commercial/2016-10-28T10:54:53
Library: 8.05.07
Platform: Win 64
Installer: J805 install
InstallPath: c:/users/paul/documents/j64-805
Contact: www.jsoftware.com
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