title: I want to plot scatter plot by every 2 columns ,meet error as Error : non-numeric argument to binary operator
body: <p>code as below:</p>
  
  <pre><code>Raw=mtcars
  cn=colnames(Raw)
  sapply(1:7,function(i)ggplot(data=Raw,aes(x=Raw[,i],y=Raw[,i+1])+
                                              geom_line()+geom_point(size=4,shape=20)+
                                              labs(x='totality_accuray',y=cn[i]))
  )
  </code></pre>
  
  <p>can help out what's issue to get this error reminder:Error in aes(x = Raw[, i], y = Raw[, i + 1]) + geom_line() : 
    non-numeric argument to binary operator </p>