Scale_shape_manual not working

Scales for shapes, aka glyphs Description. scale_shape() maps discrete variables to six easily discernible shapes. If you have more than six levels, you will get a warning message, and the seventh and subsequent levels will not appear on the plot. Use scale_shape_manual() to supply your own values. You can not map a continuous variable to shape Details. The functions scale_colour_manual(), scale_fill_manual(), scale_size_manual(), etc. work on the aesthetics specified in the scale name: colour, fill, size, etc.However, the functions scale_colour_manual() and scale_fill_manual() also have an optional aesthetics argument that can be used to define both colour and fill aesthetic mappings via a single function call (see examples). I would like a black contour for shape 21, but if I do like this, colour of shape 1 is also black. I can't fine any way to have in the same time : the good colour applied to contour of shape like 1, and to fill of shape like 21; a black (or a defined colour) applied to contour of shape like 21. Thank you for your reply. It solves the problem in my small example, but not generally. I really need to work with named colour vectors as recommended in one of the help examples of scale_colour_manual(). If I run the (second) help example with the named vector (cols), I get 4 keys in the legend (ggplot2 version 3.3.5), while a colleague got 3 keys only with ggplot2 version 3.3.3. I was using abv for fill, not samp so I was trying factorizing on abv. Something is different about ggplot2 i think. The graph is printing horizontally (landscape), something that requires coord_flip before, but now adding coord_flip flips it to vertical (portrait) - the abv axis on the vertical. It would be great if there were a scale_stroke_manual like we have for the other aesthetics. Especially when using different symbols like a solid circle and '+', I only really want thicker stroke on the '+'. Example: dat <- data.frame( T plot + aes (linetype=vore) + scale_linetype_manual (values=c (0,1,2,3,4)) does not have lines. But that has nothing to do with the manual. linetype. The issue is that qplot makes points by default. Points have. shape and colour, but not a linetype. You need to draw lines before you. see the effect of a linetype. The name of the scale - used as the axis label or the legend title. If None, the default, the name of the scale is taken from the first mapping used for that aesthetic. breaks list. A numeric vector of positions (of ticks). labels list of str. A vector of labels (on ticks). limits list. Continuous scale: a numeric vector of length two providing ggplot (data = gdata) + aes (x = x, y = y, colour = g, shape = g) + geom_point () + scale_colour_manual (values=1:10) + scale_shape_manual (values=1:10) It's because each step adds to the ggplot object, so the next component is added to the result of the previous addition. If we could see each combination in sequence The functions scale_colour_manual (), scale_fill_manual (), scale_size_manual () , etc. work on the aesthetics specified in the scale name: colour, fill, size , etc. However, the functions scale_colour_manual () and scale_fill_manual () also have an optional aesthetics argument that can be used to define both colour and fill aesthetic mappings ggplot (df, aes (x=x, y=y, colour=c)) + geom_point () + scale_colour_manual (c ('red', 'blue', 'green', 'orange')) Which results in: Error: Continuous value supplied to discrete