R ggplot2 assigning colours to a factor

ggplot2, r

Solution

The error comes because you plot:

p + geom_point(aes(colour = factor(z)))

And then try to make a new plot of:

p + scale_colour_manual(values=Palette1)

Which doesn't have any layers in it. Instead, I usually make all my assignments at the time of plotting:

ggpot(df1, aes(x, y, colour=factor(z))) + 
    geom_point() +
    scale_colour_manual(values=Palette1)

Or you can assign your first `p + geom_point(...)` to `p`:

p <- p + geom_point(...)

Then proceed as you were.

Problem

I am trying to plot a scatterdiagram x, y coloured by a factor z (five values) with the colour values assigned by a palette I have tried : ``` library(ggplot2) Palette1 <- c('red','green','blue','violet','black') p <- ggplot(df1, aes(x,y)) p + geom_point(aes(colour = factor(z))) p + scale_colour_manual(values=Palette1 ) ``` but I get an error message: ``` Error: No layers in plot ``` Thank you for your help.

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