> On Dec 10, 2019, at 6:59 PM, Jose Mario Quintana
> wrote:
>
> Gilman and Rose's APL: An Interactive Approach
> (If my memory is not betraying me.)
>
One of the nicest complements I ever received (important to me, not to him) was
when Al Rose told me once that I should write a book!
--
Hi,
Despite repeated warnings in JforC I stepped into the trap of using elseif.
and else. in the same if.-statement. It took some effort to find that
error, because the behaviour is kind of weird:
iftest =: 3 : 0
if. y=1 do.
echo 'one'
elseif. y=2 do.
echo 'two'
elseif. y=3 do.
echo 'three
> The "(a,a=. ...)" expression reminded me of an upgrade we once did to a
> Sharp APL mainframe system where one of the points of interest was how the
> upgrade handled what they called "pornographic assignment". I don't
> remember the exact example they used but this reminds me of that. I made
a
Thank you for explaining the sparse array. I misread the dictionary of
j. Yes, this is fine:
A=:1$.2e6 2e6;0 1;2*0
A=:(<;~1e6) 1:`[`]}A
Date: Tue, 10 Dec 2019 21:58:08 +1100
From: Ben Gorte
To:programm...@jsoftware.com
Subject: Re: [Jprogramming] Bug?
Message-ID:
Content-Type:
Hello
I noticed that 1!:44 (Posix chdir) doesn't report failure in J807. Shouldn't it
do that?
I have J9 at home, haven't tried that yet.
Esa
1!:44 'c:/mydir'
1!:43 ''
c:\mydir
1!:44 'c:/fakedir' NB. nonexistent directory. No error message, current
working directory stays the same.
Hi,
What is the empty string in the first sentence supposed to be for, no
sparse axes?
I'm getting:
A=:1$.10 10;''
77 (<3 4) } A
scheck i type
|system error
Is that right or wrong?
Without the ;'' everything is fine, even with very large arrays:
A=:1$.1e8 1e8
]A=:77 (<3 4) } A
3 4 │ 77
