I would like to ploit a historical plot the marks of a group of persons. The
marks are not numerical but letters : A, A-,B+,B,B-,... to F.
I have assigned integer values to each mark. when plotting the historical
changes in people's mark, my x-axis represents dates and my y-axis the
values of the marks. I would like to know whether it is possible to replace
the numerical values with alphabetical values (A,A-,B+,B...).
Thanks in advance...
PS: I have tried so many things... I finished by drawing text boxes and
placing them over the numerical values shown on the y-axis ... a bit of a
pain when the axis keeps on moving...