You didn't give any data, and I do not feel like trying to
replicate
your original numbers from the image you gave, so I will just use
some
arbitrary numbers:
data=: ?10 10$0
Now, let's say that your squares are 25 pixels on a side. We can
form
squares like this:
$square=: (>./~|i:12)%12
25 25
That's a bit big for email, so here's a smaller version:
4%~>./~|i:4
1 1 1 1 1 1 1 1 1
1 0.75 0.75 0.75 0.75 0.75 0.75 0.75 1
1 0.75 0.5 0.5 0.5 0.5 0.5 0.75 1
1 0.75 0.5 0.25 0.25 0.25 0.5 0.75 1
1 0.75 0.5 0.25 0 0.25 0.5 0.75 1
1 0.75 0.5 0.25 0.25 0.25 0.5 0.75 1
1 0.75 0.5 0.5 0.5 0.5 0.5 0.75 1
1 0.75 0.75 0.75 0.75 0.75 0.75 0.75 1
1 1 1 1 1 1 1 1 1
(That's basically the same expression, I just moved the division
over
to the left hand side, and changed the 12 to a 4, so it's 5 by 5.
The
point isn't the expression so much as the resulting data. It's
arranged as a square with values ranging from 0 in the center to 1
at
the edge.)
Now, we just need to compare this to each of our original values,
form
them into a square, and pass that on to viewmat:
require'viewmat'
viewmat ,/0|:,/0 2|:data >:/ square
Good enough?
Or would an explanation of the steps in any of those expressions
help?
(You can shave off parts of an expression to see what was passed
along, and you can shrink the data so you can inspect those
intermediate results easier. You can also use J's trace facility
and/or dissect. You can also of course read up on things in the
dictionary. But sometimes, especially after you've tried some of
those
other approaches, it can be good to have someone else give their
perspective - not so much because it's not simple but because
having
other people's words can help you think about things from a
slightly
different perspective.)
Thanks,
--
Raul
On Tue, Jan 20, 2015 at 11:48 PM, Ryan <[email protected]>
wrote:
I have a matrix of probabilities that I'd like to visualise
similar to
this:
http://emotion.inrialpes.fr/people/synnaeve/phdthesis/
images/battleship_board_3_1miss.png
where the bigger the probability, the bigger the square. The
closest
I've
come is a simple
density plot
mymat=? 27 27$0
load 'graphics/plot viewmat'
'density' plot mymatrix
NB. or
viewmat mymatrix
I've looked through plot's source code but don't see an option for
something
like this.
Does someone know if it's possible to do?
thanks for any help,
Ryan
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