[R] symbol in the plot

[gcheer3]

Thank you, David. 
thanks for letting me know how to use expression in legend. It works too.

gcheer3 wrote:
> 
> a graph question. Thanks a lot in advance.
> 
> I made two scatterplots on one graph (sigma vs. delta1, sigma vs. delta2)
> (20 observations of delta1, delta2 and corresponding sigma) the x-axis is
> sigma, the y-axis is either delta1 or delta2. I connected both
> scatterplots. To seperate them, one curves is a line with circles, the
> other curve is a line with squares on it. 
> 
> I want to make a notation either on the y-axis or on the graph. The
> notiaion is "delta1--square; delta2--circle". So when people look at the
> graph, they can easily tell each curve's meaning. The curve with squares
> on it means the sigma vs. delta1, and the curve with circles on it means
> sigma vs. delta2. I think I can use 'expression' to write delta1, delta2
> and sigma in greek letters, but I am not sure how to denote the square and
> cirle I graphed.
> 

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