How to color points by one property and shape them by another and make legends for each
I have a data table with four columns. The first two are called X and Y and are continuous variables. The last two columns are categorical variables called Color and Shape. I want to create a scatterplot of X by Y where the points are colored according to the entries in the Color column and the shape of the markers is selected according to the Shape column. I would like to make a row legend ...