按因子添加颜色时R图未显示数据点

Question

I am trying to plot an R graph with data points coloured by a factor. I am using the property col with values from a data frame column as the factor, but they seem not to be recognised correctly.

My code is as follows:

plot(marrmales$tot_nochc, xlab="", ylab="Tot hours worked",   col=marmales.df$cor_partner, pch=15)

marmales.df$cor_partner is a vector of 0 and 1.

When I plot this, only data points for which the cor_partner value is 1 are shown. If I specify colours (I thought 0 might be read as NULL and return white), all data points are shown, but in the first of the specified colours.

I have tried converting cor_partner to characters, but nothing changed.

Anyone knows what is happening? Thanks

Answer 1

The parameter col = 0 in plot() indicates no color, you can see this via colors() .

A solution to your problem can be:

plot(marrmales$tot_nochc, xlab="", 
     ylab="Tot hours worked", 
     col=as.factor(marmales.df$cor_partner), 
     pch=15)