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The X-Philes (2nd Revision)
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The X-Philes Number 1 (1995).iso
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error.doc
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1995-03-31
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56 lines
Item: 237 by _jk at hpcvbbs.UUCP
Author: [Jay Kyle]
Subj: Uncertainties
Keyw: 'ERROR' (xñdx) [that's x-plus-or-minus-dx, you non-IBMers! -jkh-]
Date: Thu Feb 28 1991
This is a program that adds, subtracts, multiplies, raises to a power, etc
uncertainties or in other words numbers such as 2 ñ 0.5. The program has full
instructions. (I decided to have this as there's nothing more frustrating than
having a program that is used occasionally and forgetting how to use it!)
[Neat idea! Now we need a menu key called 'F1'! -jkh-]
Common error analysis is done in generally two different ways, an absolute
method, and a random or systematic method. The absolute method compounds
absolute errors ie. (2ñ0.5) +(3ñ0.3)= (5ñ0.8) whereas the random method
uses a less pessimistic approach. In the case of this program, I utilized the
general formula:
dz = SQRT[(df/da)^2*da^2+(df/db)^2*dB^2+...)]
^
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(partial derivatives) for z=f(a,b,...)
which has a 90% confidence in the answer.
The program has both methods in it.
The program also utilizes a custom menu for choices of operations. I've
included a work directory as part of the program simply to go into to do any
calculations, a single program called WIPE exists that "wipes the work slate
clean " so to speak. This is just a quick way to clear work directory after
you're finished with a particular formula. I borrowed this concept from an old
hp 28 program.
Many thanks to a couple of friends, Phillip Weis and Steve Hall for beta
testing it for me.
(User.programs)
Item: 239 by _jk at hpcvbbs.UUCP
Author: [Jay Kyle]
Subj: Uncertainties math program
Keyw: xñdx, error, uncertainties
Date: Sun Mar 03 1991
This is an updated version of my uncertainties program, ( v 1.2 )
that now works with unit objects as well as real numbers. The main
description is in message #237. I have renamed it ERROR, short for
"error analysis".
error (5904 bytes)
[Uncertainties math program for lab data]
Enjoy
Jay Kyle
UBC
Chemical Engineering student.