partitions?

Hi

I'm looking for a method that given
     #(1 2 3)
returns
     #(
         #(1)
         #(2)
         #(3)
         #(1 2)
         #(2 3)
         #(1 3)
         #( 1 2 3))

Stef

Hi,
this solution is not exactly beautiful, but it works:

| input output |

input := #(1 2 3).

output :=
    Array streamContents: [
        :stream |
        1 to: input size do: [
            :take |
            input combinations: take atATimeDo: [
                :combination |
                stream nextPut: combination copy ] ] ].

output inspect

Michal

Hi

I'm looking for a method that given
    #(1 2 3)
returns
    #(
        #(1)
        #(2)
        #(3)
        #(1 2)
        #(2 3)
        #(1 3)
        #( 1 2 3))

Stef

The comment of the method
combinationsAt: jj in: aCollection after: nn do: aBlock

refers to

(1 to: 6) combinationsSize: 3 do: [:each | Transcript cr; show: each
printString]

but this method does not exist



Le 28/4/15 20:02, stepharo a écrit :

Hi michal

Thanks!

Stef

Hi,
this solution is not exactly beautiful, but it works:

| input output |

input := #(1 2 3).

output :=
    Array streamContents: [
        :stream |
        1 to: input size do: [
            :take |
            input combinations: take atATimeDo: [
                :combination |
                stream nextPut: combination copy ] ] ].

output inspect

Michal

On 28.4.2015 20:02, stepharo wrote:

Hi

I'm looking for a method that given
    #(1 2 3)
returns
    #(
        #(1)
        #(2)
        #(3)
        #(1 2)
        #(2 3)
        #(1 3)
        #( 1 2 3))

Stef

So you mean that it should be added by default?


Le 28/4/15 21:24, Sergio Fedi a écrit :
> Just in case, remember that the empty set. is also a partition​