R pass variable column indices to ggplot2 [duplicate]

Question

I'm attempting to pass the column indices to ggplot as part of a function I'll be using repeatedly. like:

myplot <- function(df){     ggplot(df, aes(df[, 1], df[, 2])) + geom_point() } 

I'll always be using the first column as my x variable and the second column as my y-variable, but the column names change between data sets. I've searched all over.. Any ideas?

EDIT:

This is the answer I used:

require(ggplot2)  myplot <- function(df){    ggplot(df, aes_string(colnames(df)[1], colnames(df)[2])) + geom_point() } 

Answer 1

You can use the aes_string in stead of aes to pass string in stead of using objects, i.e.:

myplot = function(df, x_string, y_string) {    ggplot(df, aes_string(x = x_string, y = y_string)) + geom_point()  } myplot(df, "A", "B") myplot(df, "B", "A")