Question: Graph plotting - how to change different parts of the same graph?

Hi guys,

I am dealing with a function, kappa:=6*log(R)/(R^2). To plot this, I use the command plot([kappa,R,R=0.99..6]).

However, I want the first branch of the graph to be coloured in fully, and the second branch to be dashed. Is this possible? I think I need to split the graph in 2 using the command line.

 

Thanks in advance

 

 

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