It is defined in demos/plot/plotdemo as:
steps=: {. + (1&{ - {.) * (i.@>: % ])@{:
On Sat, Apr 21, 2012 at 1:05 AM, Linda Alvord <lindaalv...@verizon.net> wrote:
> What is the definition of steps?
>
> Linda
>
> -----Original Message-----
> From: programming-boun...@jsoftware.com
> [mailto:programming-boun...@jsoftware.com] On Behalf Of Graham Parkhouse
> Sent: Friday, April 20, 2012 6:13 AM
> To: programming@jsoftware.com
> Subject: [Jprogramming] Colouring dots in plot
>
> I am producing 2D dot scatter plots of (x,y) data in monochrome. How can I
> increase the information by colouring the dots according to a colour band
> indexed by a variable z?
>
> A clue is given in the definition of the Surface of Revolution in the 3D
> examples, i.e.
>
> X=. steps _2 1.9 50
> dat=. cutxyz 40 surfacerev (2+*:X);X
> CLR=: (RED,:YELLOW) hue _8}.8}.int01 32
>
> pd 'backcolor teal;color CLR'
> pd 'edgecolor 64 64 64'
> pd 'type surface'
> pd dat
>
> Developing the ideas shown above, I have tried:
>
> RED=: 255 0 0
> YELLOW=: 255 255 0
> [CLR=: (RED,:YELLOW) hue 0.1*i.11
> 255 0 0
> 255 25.5 0
> 255 51 0
> 255 76.5 0
> 255 102 0
> 255 127.5 0
> 255 153 0
> 255 178.5 0
> 255 204 0
> 255 229.5 0
> 255 255 0
> pd 'type dot'
> pd 'pensize 5'
> pd 'color CLR'
> pd i.11
> pd 'show'
>
> This gives me a line of blue dots. If I try itemcolor instead of color I get
> the same plot followed by this error message:
>
> |length error: gppshape
> | e=.(#p) $e
>
> Can anybody help me, please?
>
> Graham
>
>
>
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