The APL Orchard

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12:08 AM

@Adám Thank you for adding me to the chat! Chatting with Aaron recently, your name came up, so it's nice to actually put a face to a name.

Steffan

1:01 AM

How do you output a number with "-" instead of the high minus?

Couldn't find it in aplcart

Atm I'm just doing {0>s:'-',⍕|s⋄s} which is pretty bad.

rak1507

1:26 AM

@user1179319 welcome

@Steffan I'd do '¯'⎕R'-'⍕

Steffan

1:43 AM

nice, thanks!

ootaulaith

Aw, using system functions is kind of cheating, no?
What about something like this? ('-',1↓r)⌷⍨⊂s⍳⍨r←∪'¯',s←⍕¯101

Steffan

this is code golf lol

rak1507

@ootaulaith I'd still rather do '-'@('¯'∘=)⍕ (basically just using @ instead of ⎕R)

ootaulaith

Ah! That's much more direct!

rak1507

there are also things with dyadic ⎕FMT... but that's complicated and confusing

Steffan

1:56 AM

that's fine lol. is it shorter?

rak1507

Steffan

i didn't find anything in the fmt spec about negative numbers.

rak1507

⋄ 'M⍞-⍞I5' ⎕FMT 1 ¯2 3 4 ¯5

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Steffan

2:18 AM

interesting

i don't want any indentation though. is there a way to use fmt without it padding the numbers?

1 hour later…

Steffan

3:45 AM

is ¯1+a+⍳1+b-a the shortest way to get an inclusive range?

rak1507

4:03 AM

depends, can a or b be negative? and can you change ⎕io?

for example if they're positive, you could do a,a↓⍳b or with ⎕io←0, a↓⍳b+1

also with ⎕io←0 you don't need the ¯1+

Adám

4:49 AM

@Steffan You could use ⎕←⎕JSON ¯101

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@Adám -101

4 hours later…

Adám

9:06 AM

@Nissa Hi there. Interested in APL?

6 hours later…

Stack Exchange Feeds

2:58 PM

Q: Read column of CSV file as array

I am trying to read a column from a CSV file into an array. So far I have successfully read the file with the code below. load 'csv' data =: readcsv '/Users/max/Desktop/prices.csv' Typing data in the interpreter brings the following table (which in what I expect) ┌────────────┬────────┬───────...

j apl

Jeremy gee

3:50 PM

trying to implement the law of sines in APL. for example I've got a formula I'm solving for B that is 340(sine60)/sine45 where everything is in degrees. I convert to radians and I get 1○÷4÷340×1○÷3 not sure where I am making the error.

the correct result is 416

Adám

@Jeremygee Isn't it ⎕←340×(1○÷3)÷1○÷4

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@Adám 449.6540688

Jeremy gee

sorry I have to run. will look in a sec. suppsed to reduce to 170 times the square root of 6

thank you so much for responding.

Adám

Oh, you're missing a couple of circles: ⎕←340×(1○○÷3)÷1○○÷4 ⋄ ⎕←170×6*÷2

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