Thank you all for your help! Ric Sherlock responded:
> Does this help? > pd 'reset' > pd 'itemcolor red' > pd 'type marker' > pd 'markersize 1.2' > pd 'markers circle' > pd (i.15);15?30 > pd 'itemcolor blue' > pd (5+ i.10);7 + 10?30 > pd 'show' > > Or are you after more of a continuous colour change? Yes, but just recognisable differences is the criterion, so not too many shades. I would like to be able to define my own palette. Andrew Nikitin responded: > > How can I > > increase the information by colouring the dots according to a colour > > band indexed by a variable z? > > Plot will not do this for you. You will have to group your data by z > variable (possibly using /. adverb) and plot each group with > appropriate color. > Same thing applies if you want to use different marker type or size. Yes, I can do this rather easily. Knowing I'm not missing an obvious trick, I shall do it this way. Ric Sherlock came back with: > Yes, here is a basic(ish) example: > > pd 'reset' > pd 'type point' > pd 'itemcolor red,orange,yellow,green,blue' > pd 'pensize 5' > dat=: 50?50 > datgrp=: <.@(%&10) dat NB. calc groups for dat > pd@> ;/@|: &.> (~.datgrp)/:~(datgrp </. ] ,.~ i.@#) dat > pd 'show' This works fine and does what I want. The only drawback is the colours. I want to be more subtle. Can I create my own palette, like was done for the Surface of Revolution, using CLR=: (RED,:YELLOW) hue 0.1*i.11? Or was this done in a plotting locale? Regards Graham ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
