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NArray help

Joe Lovick

10/16/2008 7:32:00 PM

Hi,

Could someone please tell me how the syntax works for the narray, max
and min methods.

if i use @values.max i get the max of the entire array, after reading
the narray documentation http://narray.rubyforge.o... it looks
like i can get the max of a particular dimension at an orthogonal index,
however, i am at a loss to work out how this should be specified
syntatically.

to put it another way, i have a 2D array, and i would like to find the
max and the min, of each of the columns 1..n.

Cheers

Joe
--
Posted via http://www.ruby-....
2 Answers

Joel VanderWerf

10/16/2008 7:38:00 PM

0

Joe Lovick wrote:
> Hi,
>
> Could someone please tell me how the syntax works for the narray, max
> and min methods.
>
> if i use @values.max i get the max of the entire array, after reading
> the narray documentation http://narray.rubyforge.o... it looks
> like i can get the max of a particular dimension at an orthogonal index,
> however, i am at a loss to work out how this should be specified
> syntatically.
>
> to put it another way, i have a 2D array, and i would like to find the
> max and the min, of each of the columns 1..n.

This maybe?

irb(main):006:0> a = NArray[ [1,2,3], [4,5,6] ]
=> NArray.int(3,2):
[ [ 1, 2, 3 ],
[ 4, 5, 6 ] ]
irb(main):007:0> a.max(0)
=> NArray.int(2):
[ 3, 6 ]
irb(main):008:0> a.max(1)
=> NArray.int(3):
[ 4, 5, 6 ]

So I guess 0 means "max over each row", and 1 means "max over each column".

--
vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407

Joe Lovick

10/16/2008 7:55:00 PM

0

> This maybe?
>
> irb(main):006:0> a = NArray[ [1,2,3], [4,5,6] ]
> => NArray.int(3,2):
> [ [ 1, 2, 3 ],
> [ 4, 5, 6 ] ]
> irb(main):007:0> a.max(0)
> => NArray.int(2):
> [ 3, 6 ]
> irb(main):008:0> a.max(1)
> => NArray.int(3):
> [ 4, 5, 6 ]
>
> So I guess 0 means "max over each row", and 1 means "max over each
> column".

Thanks,

my own stupidity even takes me by surprise

Cheers
Joe
--
Posted via http://www.ruby-....