# Re: [Jprogramming] advent of code 2016

```Nice, that sounds like what i had in mind. I get a domain error though:

a =. 'R2, R2, R2'```
```
O =: 4 2 \$ _1 0 0 1 1 0 0 _1
f =: 4 : 0
a =. 4 | x ({.@] +  _1 1 {~ 'R' = {.@[) {: y
y ,   a , (}. {: y) + x (".@}.@[  * O {~ ]) a
)

+&|/ }. {: > f each/ (,: 0 0 0) (, <)~ |. dltb each ',' cut a f each/
(,: 0 0 0) (, <)~ |. dltb each ',' cut a  NB. part 1

plot <"1 |: }."1 > f each/ (,: 0 0 0) (, <)~ |. dltb each ',' cut a
NB. part 2, find intersection in plot

Running all gives me:

+&|/ }. {: > f each/ (,: 0 0 0) (, <)~ |. dltb each ',' cut a f
each/ (,: 0 0 0) (, <)~ |. dltb each ',' cut a  NB. part 1
|domain error: f
|   a=.4|x    ({.@]+_1 1{~'R'={.@[){:y

This is what it works up to:

(,: 0 0 0) (, <)~ |. dltb each ',' cut a  NB. part 1
┌──┬──┬──┬─────┐
│R2│R2│R2│0 0 0│
└──┴──┴──┴─────┘

This seems to work though:

+&|/ }. {: > f each/ (,: 0 0 0) (, <)~ |. dltb each ',' cut a
2

+&|/ }. {: > f each/ (,: 0 0 0) (, <)~ |. dltb each ',' cut 'R2,R2,R2'
2

+&|/ }. {: > f each/ (,: 0 0 0) (, <)~ |. dltb each ',' cut 'R5,L5,R5,R3'
12

It looks like there may be a typo  in your paste

This

+&|/ }. {: > f each/ (,: 0 0 0) (, <)~ |. dltb each ',' cut a f each/
(,: 0 0 0) (, <)~ |. dltb each ',' cut a  NB. part 1

Should be this:

+&|/ }. {: > f each/ (,: 0 0 0) (, <)~ |. dltb each ',' cut a

On Thu, Dec 1, 2016 at 2:11 PM, 'Pascal Jasmin' via Programming
<programm...@jsoftware.com> wrote:
> I posted an alternate solution,
>
> a =. wdclippaste '' NB. input from clipboard
>
> O =: 4 2 \$ _1 0 0 1 1 0 0 _1
> f =: 4 : 0
> a =. 4 | x ({.@] +  _1 1 {~ 'R' = {.@[) {: y
> y ,   a , (}. {: y) + x (".@}.@[  * O {~ ]) a
> )
>
> +&|/ }. {: > f each/ (,: 0 0 0) (, <)~ |. dltb each ',' cut a f each/ (,: 0 0
> 0) (, <)~ |. dltb each ',' cut a  NB. part 1
>
>
> plot <"1 |: }."1 > f each/ (,: 0 0 0) (, <)~ |. dltb each ',' cut a  NB. part
> 2, find intersection in plot
>
> general description,
>
> O holds direction vectors,
> 0 0 0 is appended to reversed list of commands, where position 0 is the
> orientation index into 0, and other 2 are x y positions of taxi.
>
> f/ updates orientation and x y on each iteration, where intermediate value a
> is new orientation.
>
>
>
>
> ----- Original Message -----
> From: Joe Bogner <joebog...@gmail.com>
> To: programm...@jsoftware.com
> Sent: Thursday, December 1, 2016 1:43 PM
> Subject: Re: [Jprogramming] advent of code 2016
>
> I added an alternate solution to problem 1, part 1 -
>
> If I had the time, I would think about how to reformulate it so I
> could use / to reduce the input to a single solution. I recall using
> that pattern last year
>
>
> On Thu, Dec 1, 2016 at 12:53 PM, Joe Bogner <joebog...@gmail.com> wrote:
>> I've started a wiki page for it so we don't have to go back and add
>> them later. Feel free to edit/add
>>
>>
>> My solution to the first problem is pretty bad (works though). I
>> intend to add another solution that's in a more functional style
>>
>> On Thu, Dec 1, 2016 at 11:16 AM, 'Pascal Jasmin' via Programming
>> <programm...@jsoftware.com> wrote:
>>> back again this year,
>>>
>>>