# Re: [Scilab-users] how do I plot 9 curves with automatic colour sequencing?

```Le 03/06/2023 à 18:17, Heinz Nabielek a écrit :

Colleagues:```
```
[sorry, has been asked before but forgot]: how do I plot 9 curves with
automatic colour sequencing?

o       Problem #1: colour 8 is white and I cannot see my curve
o       Problem #2: colours >= 9 become rather non distinct

Is there an easy solution without complex SciLab acrobatics?

The same topic was dealt with on 202-03-20 @
https://www.mail-archive.com/users@lists.scilab.org/msg11103.html

Defining a general strategy of automatic assignment of curves style is not
necessarily trivial.
The current strategy is not the same for plot(): cycling over 7 colors ; and
for plot2d(): scanning the current colormap

Whatever the strategy that you design and then propose and use, it will always
have a limit.
You can't expect to have a always valid method.

The current plot() strategy could be improved for instance by cycling in a
nested way first over line styles,
starting with solid lines as now, and then over line colors.
This would increase the limit to 7x10=70 styles, instead of currently 7.

Please feel free to open a report about the topic if you deem it is worthwhile,
with a rationale. Any actual algorithmic proposal is also welcome.

There is no general solution, but there are easy ways to customize the curve
styles by hand, even at calling time, without post-processing.

x = 0:.05:1;
clf reset
plot(x, sin(x'*(1:10)), "color",[1:6 13 17 28 32])    // "color" option
legend(msprintf("Curve #%d\n",(1:10)'), "in_lower_left");

[cid:part1.37Mim3rA.GDIR3PW8@free.fr]

With plot2d(), you get the same figure without the legend with:

x = 0:.05:1;
clf reset
plot2d(x, sin(x'*(1:10)), [1:6 13 17 28 32])

You may also customize the colormap before calling plot2d(), without the style
option.
The hsvcolormap is quite handy because it alternates colors:

x = 0:.05:1;
clf
gcf().color_map = hsvcolormap(11);
plot2d(x, sin(x'*(1:10)))
legend(msprintf("Curve #%d\n",(1:10)'), "in_lower_left");

[cid:part2.pmU8pSci.HfJ9HZA4@free.fr]

All these options are documented.

Regards
Samuel

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