Converting a plot to a square plot

Asked Sep 12 '17 at 22:12

Active Sep 12 '17 at 22:15

Viewed 44 times

I have two ROC curves are plotted in one plot. How can I convert the plot to a square plot ? And how can I give the first curve a green colour and the second curve a red colour? Here is a producible example:

par(mar=c(5,4,4,2)+0.1) 
library(ROCR)
data(ROCR.simple)
pred <- prediction( ROCR.simple$predictions, ROCR.simple$labels )
pred2 <- prediction(abs(ROCR.simple$predictions + 
                        rnorm(length(ROCR.simple$predictions), 0, 0.1)), 
                ROCR.simple$labels)
perf <- performance(pred, "tpr", "fpr" )
perf2 <- performance(pred2, "tpr", "fpr")
plot(perf)
plot(perf2, add = TRUE)

Any suggestions would be appreciated. Thank you!

edited Sep 12 '17 at 22:15

Axeman

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asked Sep 12 '17 at 22:12

Joe

1

See [this](https://stackoverflow.com/questions/8693558/how-to-define-fixed-aspect-ratio-for-scatter-plot#8762825)? – Axeman Sep 12 '17 at 22:14
Hey @Axeman , this has solved the problem, but how can I add colour to the curves to depreciate them ? – Joe Sep 12 '17 at 22:30
That would be a whole different question. – Axeman Sep 12 '17 at 22:30
1

@Joe: try plot(perf2, add = TRUE, col = "green") – missuse Sep 12 '17 at 22:36

Converting a plot to a square plot

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