[Pdl-devel] sequence

[Luis M. <mo...@ic...>]

Hi,

I just discovered a mistake in one of my codes as I misunderstood the
behavior of 'sequence':

     pdl> p sequence 5
     [0 1 2 3 4]
     pdl> p sequence pdl 5
     0
     pdl> p sequence zeroes(5)
     [0 1 2 3 4]
     pdl> p sequence(2,3)
     [
      [0 1]
      [2 3]
      [4 5]
     ]
     pdl> p sequence(pdl(2),pdl(3))
     0

Thus, it seems that sequence behaves like zeroes, ones, etc. when it
gets pdl scalars as arguments, ignoring their value.
The documentation suggests to 'see zeroes',

     pdl> help sequence
     Module  PDL::Basic
       sequence
	 Create array filled with a sequence of values

	  $w = sequence($y); $w = sequence [OPTIONAL TYPE], @dims;

	 etc. see zeroes.

	  pdl> p sequence(10)
	  [0 1 2 3 4 5 6 7 8 9]
	  pdl> p sequence(3,4)
	  [
	   [ 0  1  2]
	   [ 3  4  5]
	   [ 6  7  8]
	   [ 9 10 11]
	  ]


but maybe adding an example with a template argument such as
$pdl_scalar->sequence, sequence($pdl_scalar), $ndarray->sequence, and
sequence($ndarray) would help avoid surprises.

Regards,
Luis

--

                                                                  o
W. Luis Mochán,                      | tel:(52)(777)329-1734     /<(*)
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