循环变量名称以在 R 中绘制相似图形

Question

I want to plot similar figures by using a list of variables.

The list of variables are "wuc_above, parti_above, "see_above", "look_above". All these variables are dummies(ie, they equal to either 0 or 1)

The code to plot the figures are:

pdf(file ="mypath/wuc_above.pdf")
boxplot(x1[wuc_above==1] ,x2[wuc_above==1])
dev.off()
}

I want to replace the variable "wuc_above" by "parti_above", "see_above", "look_above". x1, x2 are some numeric variables that scale from 0 to 7.

It works like the Stata global function. However, I didn't figure out how to achieve this in R. Could anyone help me? Thanks!

I've written sth like (of course this does not work...)

varlist <- variable.names(wuc_above,parti_above)
for (i in varlist) {
pdf(file =paste0('"mypath/',i,'.pdf'"))
boxplot(x1[paste0(i)==1] ,x2[paste0(i)==1])
dev.off()
}

Answer 1

Don't iterate over variable names. Put the variables in a list or a data.frame and then iterate over list items or data frame columns.

You haven't shared any data so this is completely untested (please make your example reproducible if you need more help), but something like this should work:

varlist = list(wuc_above = wuc_above, parti_above = parti_above)
for (i in seq_along(varlist)) {
  pdf(file = paste0('mypath/', names(varlist)[i], '.pdf'))
  boxplot(x1[varlist[[i]] == 1] ,x2[varlist[[i]] == 1])
  dev.off()
}

See my answer at How to make a list of data frames for good context.