Like this? (3#"0 i.255) viewmat D;'Grade from white to black, clockwise from North'
Thanks, -- Raul On Sun, Mar 30, 2014 at 4:09 PM, Linda Alvord <[email protected]>wrote: > Here's another solution: > > RM=: (# # +/ % #)"1 > grayRM=:RM P8 > (grayRM) viewmat D;'Gray Clock 1 Raul Miller' > > grayDL-:grayRM > > Actually both roads lead to the same Rome. > > Raul. If you look at your clock, can you make a better clock face that > grades from white to black going clockwise from North? > > Linda > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Linda > Alvord > Sent: Sunday, March 30, 2014 3:29 PM > To: [email protected] > Subject: Re: [Jprogramming] Challenge 14; Colorful Creations > > Here's the first entry from David Lambert. > > grayDL=: P8 +/ .*3 3$1r3 > (grayDL) viewmat D;'Gray Clock 1 Dave Lambert' > > Imagine that his image is the face of a clock. What I am looking for in > Example 2 is a clock face that will be a better gradient from white to > black > if you start at noon and travel around the clock going clockwise all the > way > to 12 again. > > Linda > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Linda > Alvord > Sent: Sunday, March 30, 2014 12:26 PM > To: [email protected] > Subject: [Jprogramming] Challenge 14; Colorful Creations > > Challenge 13 was posted on 7/2/2012. It must be time for another. Here > is > challenge 14: > Copy the code below into a new temp in jqt. Now run all lines of the > code. > > require 'viewmat' > > at2=: 13 :'([:{:"1 *.) j./"1 y' > viewmat (D=:at2"0 /~ i:300);'Arctan' > ]P8=: 255* #:i.8 > P8 viewmat D;'Challenge Example 1' > > NB. When you run the code above, you will create 2 bmp images. > NB. D is the numeric array of data and > NB. P8 is the 8 color palette. > > NB. Here is the challenge: > NB. Design a function called "gray" that will convert Example 1 into a > grayscale image. > > NB. gray=: > > (gray P8) viewmat D;'Gray Challenge 1' > > Please provide an expression that will when inserted for gray above will > produce the grayscale image. > > Pasting the bmp as an inserted image works in emails, but will be rejected > in the forum. > > Have fun. > > Linda > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
