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Friday Afternoon Puzzler [message #66841]

Fri, 12 June 2009 13:51

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Folks,

If you've already had a beer, you may want to work
on this one. Should we be concerned? Or is this just
one more example for the Sky is Falling article?
I've voiced my opinion, but it didn't satisfy the
complainant. What say you?

curly=[-1.912,-1.852,-1.386,-0.818,-0.343,-0.343,-1.233]
larry=[-1.912,-1.852,-1.386,-0.818,-0.343,-0.343,-1.233]
curly = curly*!PI/180.
larry *= !PI/180.
diff=curly-larry
print,diff

curly=[-1.912,-1.852,-1.386,-0.818,-0.343,-0.343,-1.233]
larry=[-1.912,-1.852,-1.386,-0.818,-0.343,-0.343,-1.233]
curly = curly*!PI/180.
larry = larry*!PI/180.
diff=curly-larry
print,diff

curly=[-1.912,-1.852,-1.386,-0.818,-0.343,-0.343,-1.233]
larry=[-1.912,-1.852,-1.386,-0.818,-0.343,-0.343,-1.233]
curly *= !PI/180.
larry *= !PI/180.
diff=curly-larry
print,diff

The results:

-3.72529e-009 0.000000 0.000000-9.31323e-010 0.000000
0.000000 0.000000
0.000000 0.000000 0.000000 0.000000 0.000000
0.000000 0.000000
0.000000 0.000000 0.000000 0.000000 0.000000
0.000000 0.000000

Why aren't the first set of differences (where the assignment
is made with the *= operator) *exactly* zero?

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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Friday Afternoon Puzzler

By: David Fanning on Fri, 12 June 2009 13:51

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