[R] Plot Legend

[R. Michael Weylandt]

Are you sure you are using the data set mtcars? That data set doesn't
have variables Na or K nor does it look like what you provided...

For the real mtcars, you could try this which I think does something
like what you want.

with(mtcars, plot(cyl, mpg, pch = carb, col = gear))
with(mtcars, legend("top", legend = unique(carb), pch = unique(carb)))
with(mtcars, legend("bottom", legend = unique(gear), pch = 20, col =
unique(gear)))


Michael

On Mon, Oct 24, 2011 at 6:21 AM, RMSOPS <ricardosousa2000 at clix.pt> wrote:
>
> Good Afternoon,
>
>
> I am inexperienced in data visualization R. so I wonder if someone can help
> me.
> I am using the generic database mtcars.
> I would like to change the chart plot, instead of appearing the name of the
> medicine, I wanted a symbol in the chart drugX arise for example in a yellow
> circle, and so for the rest of the drugs.
>
> I am using the following code.
>
>
>
> dataset
>    Age Sex     BP Cholesterol       Na        K  Drug
> 1    23   F   HIGH        HIGH 0.792535 0.031258 drugY
> 2    47   M    LOW        HIGH 0.739309 0.056468 drugC
> 3    47   M    LOW        HIGH 0.697269 0.068944 drugC
> 4    28   F NORMAL        HIGH 0.563682 0.072289 drugX
> 5    61   F    LOW        HIGH 0.559294 0.030998 drugY
> 6    22   F NORMAL        HIGH 0.676901 0.078647 drugX
> 7    49   F NORMAL        HIGH 0.789637 0.048518 drugY
> 8    41   M    LOW        HIGH 0.766635 0.069461 drugC
> 9    60   M NORMAL        HIGH 0.777205 0.051230 drugY
> 10   43   M    LOW      NORMAL 0.526102 0.027164 drugY
> 11   47   F    LOW        HIGH 0.896056 0.076147 drugC
>
> plot(dataset$Na, dataset$K, main="Na vs K",
>   xlab="Na", ylab="K", pch=20, col="blue")
>  text(dataset$Na,dataset$K,dataset$Drug, cex=0.6, pos=4, col="red")
>
>
> The idea is that instead of writing the name had to be a legend and symbol
> was designed in a different color for each drug
>
> Thanks
>
>
> --
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>
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