Thanks to all!
Kip Murray showed me that I am dealing with a noun that is a table and not an
atom! His solution ,A turns a list into an atom.
]A=:1 1$4
4
]C=:''
]B=:3 5 7
]B=:3 5 7
3 5 7
Two alternatives helped:
B+A
|length error
| B +A
B+{.@,A NB. Bill Lam
7 8 9
B+''$,AN NB. Henry Rich
7 8 9
B+{.,A
7 8 9
I add the third because I try to avoid @ and I create the problem most often
by using {
All work if the noun is empty.
C+{.@,A
C+''$,A
C+{.,A
So this thread really should be called: Table to Atom - First time around.
Linda
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Henry Rich
Sent: Monday, September 03, 2012 1:16 AM
To: [email protected]
Subject: Re: [Jprogramming] Scalar to Vector - Yet again
The easiest way to make a scalar of an arbitrary noun is
''($,)A
which will work on anything except an empty A.
Henry Rich
On 9/2/2012 10:52 PM, Roger Hui wrote:
> You are (probably) trying to undo years of conditioning in APL, which
> has the misguided "singleton extension": In APL,
> 2 3 4 + (?n⍴1)⍴5
> worked. Singleton extension is undesirable because it complicates the
> rules for the rank operator.
>
>> It feels wrong to have to do things like this every time I want to
>> use the result of a previous computation called A .
>
> Alternatively, it feels wrong that A is non-scalar as computed.
>
>
>
> On Sun, Sep 2, 2012 at 6:48 PM, Linda Alvord <[email protected]>wrote:
>
>> I finally think I know what I don't know. I want to turn "table" A
>> into a scalar (which it happens to look like).
>>
>> A
>> 4
>> $A
>> 1 1
>> B=:3 5 7
>> A+B
>> |length error
>> | A +B
>> (,A)+B
>> |length error
>> | (,A) +B
>> (,3$A)+B
>> 7 9 11
>> (,($B)$A)+B
>> 7 9 11
>>
>> It feels wrong to have to do things like this every time I want to
>> use the result of a previous computation called A .
>>
>> Linda
>>
>> -----Original Message-----
>> From: [email protected]
>> [mailto:[email protected]] On Behalf Of Linda
>> Alvord
>> Sent: Saturday, September 01, 2012 7:26 PM
>> To: [email protected]
>> Subject: Re: [Jprogramming] Scalar to Vector - Yet again
>>
>> I wasn't thinking. A isn't a scalar. I even knew it had shape 1 1 .
>>
>> A
>> 4
>> $A
>> 1 1
>> $3 2
>> 2
>> 2$A
>> 4
>> 4
>> 3 2 + ,2$A
>> 7 6
>>
>> This works! Thanks.
>>
>> Linda
>>
>> -----Original Message-----
>> From: [email protected]
>> [mailto:[email protected]] On Behalf Of km
>> Sent: Saturday, September 01, 2012 6:10 PM
>> To: [email protected]
>> Subject: Re: [Jprogramming] Scalar to Vector - Yet again
>>
>> ,4 is a vector
>>
>> Sent from my iPad
>>
>>
>> On Sep 1, 2012, at 4:56 PM, "Linda Alvord" <[email protected]>
>> wrote:
>>
>>> I vow to remember how to do this, and several months later I forget
>>> and can't find it
>>>
>>> anywhere. Is there some way to get to the example from the
>>> vocabulary
>> page?
>>> Maybe I can remember that.
>>>
>>>
>>>
>>> A=:1 1$4
>>>
>>> 3 2 + A
>>>
>>> |length error
>>> | 3 2 +A
>>>
>>>
>>>
>>> Thanks.
>>>
>>>
>>>
>>> Linda
>>>
>>> --------------------------------------------------------------------
>>> -- For information about J forums see
>>> http://www.jsoftware.com/forums.htm
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