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Revision 6499 Revision 6545
2 2
3################################################################ 3################################################################
4# subroutines 4# subroutines
5################################################################ 5################################################################
6 6
7=head1 NAME
8
9PGanalyzeGraph.pl
10
11=head1 DESCRIPTION
12
13These routines support the
14analysis of graphical input from students.
15
16=cut
7 17
8 18
9=head4 detect_intervals 19=head4 detect_intervals
10 20
21
22
11 input: $pointDisplayString 23 input: $pointDisplayString
12 return delimited string of triplets 24
13 each triplet has the form x y yp (space delimited)
14 giving the x, y and y'(x) values at x respectively
15 return: (\@combined_intervals, \@values) 25 return: (\@combined_intervals, \@values)
16 @values contains the y values of the function in order 26 @values contains the y values of the function in order
17 @combined_intervals contains anonymous arrays of the form 27 @combined_intervals contains anonymous arrays of the form
18 [ $slope, $left_x, $right_x] indicating the gradient on that segment. 28 [ $slope, $left_x, $right_x] indicating the gradient on that segment.
19 successive intervals will have different slopes. 29 successive intervals will have different slopes.
20 30
21 31
22=cut 32=cut
23 33
34
35
24sub detect_intervals { 36sub detect_intervals {
25 my $pointDisplayString = shift; 37 my $pointDisplayString = shift;
26 my @intervals; 38 my @intervals;
27 my @combined_intervals=(); 39 my @combined_intervals=();
28 my @points; 40 my @points;

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