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Question: Extend/Truncate list of Colours to plot

Question:Extend/Truncate list of Colours to plot

Ronan 1207 Maple 2024
color list plotting
September 05 2024
1

I need to automatically extend or truncate a colour list to suit number of points in plottools:-point plot.
extending the list the colour sequence could be repeated or if the is too awkard just add black.
I can't figure out how to select the list of colours to put into a new list to modify.

This will be inside a plotting procedure.

> 

restart
> 

with(ListTools)

[BinaryPlace, BinarySearch, Categorize, Classify, Collect, Deal, DotProduct, Enumerate, FindMaximalElement, FindMinimalElement, FindRepetitions, Flatten, FlattenOnce, Group, Interleave, InversePermutation, Join, JoinSequence, LengthSplit, MakeUnique, Occurrences, Pad, PartialSums, Reverse, Rotate, Search, SearchAll, SelectFirst, SelectLast, Slice, Sorted, Split, Transpose, Unpermute]

 (1)
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L:=[[1,2],[3,4],[-5,6],[-3,-2]]

[[1, 2], [3, 4], [-5, 6], [-3, -2]]

 (2)
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qty:=nops(L)

4

 (3)
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styles:=[symbol=solidcircle,colour=[red,green,blue,orange],symbolsize=12]

[symbol = solidcircle, colour = [red, green, blue, orange], symbolsize = 12]

 (4)
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plots:-display(plottools:-point(L,styles[]))

 
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#Need to extend or truncate the list of colours to match the number of points
#styles can be copied to styles 1,2 etc
#the extended list would be a repeatition of the colour sequence given
#would need to look for color or colour;

has(styles,colour); #how to select colour our into a seperate list?

true

 (5)
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#too few point for the colours;
L1:=[[1,2],[3,4],[-5,6]]

[[1, 2], [3, 4], [-5, 6]]

 (6)
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plots:-display(plottools:-point(L1,styles[]))

Error, (in Plot:-Structure:-Points) number of colors must match number of points

  
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#too many point for the colours;
L2:=[[1,2],[3,4],[-5,6],[-3,-2],[6-1],[0,1]]

[[1, 2], [3, 4], [-5, 6], [-3, -2], [5], [0, 1]]

 (7)
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plots:-display(plottools:-point(L2,styles[]))

Error, (in plottools:-point) incorrect arguments for creating points structure, try providing the dimension option

  
 

 

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