[Jprogramming] Open, padding with zeroes

[Dan Bron]

Here's a previous discussion of this topic, which includes tools in the spirit of >!. :

http://www.jsoftware.com/pipermail/programming/2010-December/021289.html

-Dan

Please excuse typos; composed on a handheld device.

On Dec 5, 2012, at 5:55 AM, Roger Hui <rogerhui.canada at gmail.com> wrote:

>> The dictionary entry for Open says: 'Results of different shapes are
> padded as defined
>> in Section II B. ', but Section II B is not about padding. Should it have
> been another section?
> 
> The relevant passage in II B (
> http://www.jsoftware.com/help/dictionary/dictb.htm ) is this:
> 
> Commonly these individual shapes agree, but if not, they are first brought
> to a common rank by introducing leading unit axes to any of lower rank, and
> are then brought to a common shape by *padding* with an appropriate
> *fill*element: space for a character array,0 for
> a numeric array, and a boxed empty list for a boxed array. For example:
> 
> The fill element used for this purpose is not subject to !. .
> 
> 
> On Wed, Dec 5, 2012 at 2:26 AM, Bo Jacoby <bojacoby at yahoo.dk> wrote:
> 
>> Dear J'ers
>> 
>> The Fit conjunction (!.) changes the default fill character like this
>>   3 ({.!.'0') '11'
>> 110
>> but Fit gives domain error with Open:
>>> '11';'111'
>> 11
>> 111
>>   (>!.'0')'11';'111'
>> |domain error
>> |   (    >!.'0')'11';'111'
>> 
>> I want this
>> 110
>> 111
>> 
>> What is the work-around?
>> 
>> The dictionary entry for Open says: 'Results of different shapes are
>> padded as defined in Section II B. ', but Section II B is not about
>> padding. Should it have been another section?
>> 
>> - Bo
>> ----------------------------------------------------------------------
>> For information about J forums see http://www.jsoftware.com/forums.htm
>> 
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm