How to have legend coloured according to data

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alejandro paradiso 2023-2-3

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评论： alejandro paradiso 2023-2-3

Good Morning to all,

I've created a scatter plot with week days on the x and counter on the y axis. now i've get the graph with marker coloured according to weekday. my struggle is to have the legend following the weekday too. I've tried to treat legend as object, but i cannot get the result

thank you

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Dave 2023-2-3

Alejandro, quick clarification. Are the colors in your scatter plot really colored according the weekday or are they colored according to the counter reading?

alejandro paradiso 2023-2-3

编辑：alejandro paradiso 2023-2-3

在 MATLAB Online 中打开

monthlyAccidents=groupsummary(data,["AccidentMonth","AccidentWeekDay2"])
monthlyScatter=scatter(monthlyAccidents.AccidentMonth,monthlyAccidents.GroupCount,30,monthlyAccidents.AccidentWeekDay2,"filled")

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Answer 1

Walter Roberson 2023-2-3

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I suggest you consider using gscatter

Otherwise, you have two possibilities:

use one scatter() call for each different group, so that one scatter object is created per group. Each scatter object can have its own legend entry; or
use only a single scatter() call with the "color" parameter set according to day of the week. But then use h(K) = scatter(nan,nan,[],COLOR); repeatedly to add additional invisible scatter objects. Then pass that handle h to legend() as the first parameter, so that it will create legend entries only for those (invisible) objects.