[R] newbie: grading an histogram for several classes of the same discipline
Mauricio Ortiz Calvao
orca at if.ufrj.br
Tue Oct 27 21:17:51 CET 2009
Sorry for the simple question, but I have been unable to find an answer.
I am the coordinator of a basic discipline in a university; we have
several classes taking this discipline and I would like to compare the
grades, via a histogram for the distinct classes.
Concretely, I have five ascii files (named according to each class: EC,
EE, EM, EP, EQ) with three columns each, named according to the exams
(P1, P2 and PF: first, second and final). Each one of the files has a
different number of columns, owing to the DIFFERENT number of students
in each class; example:
P1 P2 PF
3.4 4.0 5.9
4.3 7.0 2.0
7.8 5.8 7.0
P1 P2 PF
6.3 5.0 7.4
4.9 4.9 8.5
7.7 2.5 5.3
4.6 7.8 5.7
7.7 7.0 5.6
2.4 3.8 5.4
I would like to create a certain R data type/object/class such that it
kind of stores all five (5) files into it [dataframe??]; then I would
give a command that would create five histograms in five distinct
subplots of the same figure, so that we could visually compare the
performance of the different classes in each exam...
Thanks for any guidance!
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