Here's how I got to my standard palette.
viewmat i.8
]RGB=:255*#:i.8
0 0 0
0 0 255
0 255 0
0 255 255
255 0 0
255 0 255
255 255 0
255 255 255
RGB viewmat i.8
]GRB=:1 0 2{"1 RGB
0 0 0
0 0 255
255 0 0
255 0 255
0 255 0
0 255 255
255 255 0
255 255 255
GRB viewmat i.8
(|.GRB) viewmat i.8
(|.GRB) viewmat i.8
Now colors range from white to black and you can "see" white in JHS.
An image shows where,all the very big numbers as white to very light colors.
Very small numbers very dark to black in the image.
Then, the final image is just a picture of where numbers in the data are.
MY STANDARD PALETTE: GRB=:|.255*1 0 2{"1 #:i.8
Linda
-----Original Message-----
From: programming-boun...@forums.jsoftware.com
[mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Linda A
Alvord
Sent: Sunday, January 3, 2016 7:32 AM
To: programm...@jsoftware.com
Subject: Re: [Jprogramming] feedback wanted for mandelbrowse tutorial
Pascal, Viewmat is a dyadic verb. All you need is a table of (N,3) of colors
like
]P=:3 3$255 0 0 255 255 0 0 0 255
255 0 0
255 255 0
0 0 255
This selects red, yellow and blue from (256x^3) colors.
256x ^3
16777216
Give a child a box with 16,777,216 crayons next Christmas!
Now select a table of choices of your three colors and paint your picture.
load 'viewmat'
]W=:?4 7$3
P viewmat W
Viewmat W
Now you can "fix" my fliht plan!
Linda
Viemat used as a monad chooses the colors for you.
Linda
-----Original Message-----
From: programming-boun...@forums.jsoftware.com
[mailto:programming-boun...@forums.jsoftware.com] On Behalf Of 'Pascal
Jasmin' via Programming
Sent: Saturday, January 2, 2016 10:09 PM
To: programm...@jsoftware.com
Subject: Re: [Jprogramming] feedback wanted for mandelbrowse tutorial
looks cool. I don't know viewmat or mandelbrot formula well, but a pair of
rationals might work.
a fairly insignificant criticism is
mbrowse_z_ =: conew & 'mbrowse'
is more robustly,
mbrowse_z_ =: conew bond 'mbrowse'
________________________________
From: Michal Wallace < <mailto:michal.wall...@gmail.com>
michal.wall...@gmail.com>
To: <mailto:programm...@jsoftware.com> programm...@jsoftware.com
Sent: Saturday, January 2, 2016 9:11 PM
Subject: [Jprogramming] feedback wanted for mandelbrowse tutorial
Hey all. Happy new year!
I made a small GUI app for a tutorial video I'm planning:
<https://github.com/tangentstorm/mandelbrowse>
https://github.com/tangentstorm/mandelbrowse
It draws the mandelbrot set, and lets you zoom in and out.
I was hoping I could get some feedback on the code before I filmed anything.
In particular, you can only zoom in a few steps before the edge starts
smoothing out.
I think the problem has to do with lack of precision in J's complex number
type.
Is there anything I can do about this, other than implementing my own
complex
number type as a pair of extended precision numbers?
Thanks!
-Michal
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