[R] symbol in the plot

[David Winsemius]

On Nov 20, 2009, at 10:52 AM, gcheer3 wrote:

>
> Thank you again, Joh
>
> Based on your code seems I solved the problem.
> new code as follows:
> cs<-expression(delta[1], delta[2])
> plot(sigma, delta1, ylim=range(-0.5, 2), xlab='sigma', ylab='delta',  
> pch=22,
> type='o')
> points(sigma, delta2, col='red', axes=FALSE, type='o')
> legend("topleft", cs,    pch = c(21, 22), lty=1, col=2:1)
>
> only concern is there is a waring message in R: Warning message:
> In plot.xy(xy.coords(x, y), type = type, ...) :
>  "axes" is not a graphical parameter

You should not be specifying axis types or flags to a function,  
[ points() in this case] that is not intended to do anything with the  
axes. To be Biblical: If thine warning offend thee, pluck it[the  
argument] out.

-- 
David
>
>
>
> 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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David Winsemius, MD
Heritage Laboratories
West Hartford, CT