PSPP-BUG: [bug #21101] crashes when plotting histogram with normal curve

[Ben Pfaff]

Update of bug #21101 (project pspp):

                Category:                    None => Output Driver          
                  Status:                    None => Ready for Test/Review  

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Follow-up Comment #1:

>This syntax causes an assertion failure. 

The assertion failure on this line:
     assert(range == x_max - not_used);
where range, x_max, and not_used are all "double"s.  Thus, this assertion is
simply invalid, because it assumes that "double"s are infinitely precise.  You
can see from my GDB session below that in fact the value of range is quite
close to x_max - not_used:

 (gdb) p range
 $1 = 3.4545454545454533
 (gdb) p x_max
 $2 = 3
 (gdb) p not_used
 $3 = -0.45454545454545453

Thus, I'm attaching a patch that simply removes the assertion.

(file #13977)
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Additional Item Attachment:

File name: histogram_plot-assertion-fix.patch Size:0 KB


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