Jim,
I just translated that old pmt into an explicit version which contains y and is
monadic. As you learn the J vocabulary this will become readable. J is executed
from right to left so start from 1{y.
PMT=: 13 :'(2}y)*((0{y) % 1200) * ((1 + (0{y) % 1200) ^ 1{y) % ((1 + (0{y) %
1200) ^ 1{y) - 1'
A=:5.75 240 12500
PMT A
87.7604
If it can, 13 : will reply in J's tacit language. PMT returns a tacit response.
2} * (1200 %~ 0 { ]) * ((1 + 1200 %~ 0 { ]) ^ 1 { ]) % 1 -~ (1 + 1200 %~ 0 { ])
^ 1 { ]
Notice %~ , it shows you that your explicit order could be improved. Now, chop
it into words. This is "J speak"
;:'2} * (1200 %~ 0 { ]) * ((1 + 1200 %~ 0 { ]) ^ 1 { ]) % 1 -~ (1 + 1200 %~
0 { ]) ^ 1 { ]'
┌─┬─┬─┬─┬────┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬────┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬────┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐
│2│}│*│(│1200│%│~│0│{│]│)│*│(│(│1│+│1200│%│~│0│{│]│)│^│1│{│]│)│%│1│-│~│(│1│+│1200│%│~│0│{│]│)│^│1│{│]│
└─┴─┴─┴─┴────┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴────┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴────┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┘
If you work on a laptop you could read all this much better. As you study it
from right to left you will be able to tell where y belongs. Try this on a
dyadic function to see some differences.
Linda
-----Original Message-----
From: Programming <[email protected]> On Behalf Of 'Jim
Russell' via Programming
Sent: Tuesday, September 11, 2018 4:04 PM
To: [email protected]
Subject: Re: [Jprogramming] [Jpr
I for one would love to see that (a clear description of how 13 : converts
explicit expressions to tacit) but I can’t promise that I would understand it.
> On Sep 11, 2018, at 1:05 PM, Raul Miller <[email protected]> wrote:
>
> a clear description of how 13 : converts explicit expressions to tacit.
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