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PGgraders.pl DESCRIPTION
Grader Plug-ins
full_partial_grader
########################################################### # If the final answer is correct, then the problem is given full credit # and a message is generated to that effect. Otherwise, partial credit # is given for previous parts.
custom_problem_grader_0_60_100(@rh_evaluated_answers,$rh_problem_state,%form_options)
################################################################ # We need a special problem grader on this problem, since we # want the student to get full credit for all five answers correct, # 60% credit for four correct, and 0% for three or fewer correct. # To change this scheme, look through the following mess of code # for the place where the variable $numright appears, and change # that part. # Also change the long line beginning "msg ==>", to show what will # appear on the screen for the student. # # To look at the problem itself, look for the boxed comment below # announcing the problem itself. ################################################################
NOTE:
################################################################ # This problem grader was contributed by Prof. Zig Fiedorowicz, # Dept. of Mathematics, Ohio State University on 8/25/01. # As written, the problem grader should be put in a separate macro file. # If actually inserted into a problem, you need to replace a couple # of backslashes by double tildes. # # This is a generalization of the previous custom grader. # This grader expects two array references to be passed to it, eg. # $ENV['grader_numright'] = [2,5,7,10]; # $ENV['grader_scores'] = [0.1,0.4,0.6,1] # Both arrays should be of the same length, and in strictly # increasing order. The first array is an array of possible # raw scores, the number of parts of the problem the student might # get right. The second array is the corresponding array of scores # the student would be credited with for getting that many parts # right. The scores should be real numbers between 0 and 1. # The last element of the 'grader_scores' array should be 1 (perfect # score). The corresponding last element of 'grader_numright' would # be the total number of parts of the problem the student would have # to get right for a perfect score. Normally this would be the total # number of parts to the problem. In the example shown above, the # student would get 10% credit for getting 2-4 parts right, 40% # credit for getting 5-6 parts right, 60% credit for getting 7-9 parts # right, and 100% credit for getting 10 (or more) parts right. # A message to be displayed to the student about the grading policy # for the problems should be passed via # $ENV{'grader_message'} = "The grading policy for this problem is..."; # or something similar. ################################################################
File path = /ww/webwork/pg/macros/PGgraders.pl
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