79845
2002-12-17 14:19:10 +0000
Package info (from rpmquery -i) incorrect
2005-10-31 22:00:50 +0000
1
1
8
Retired
Red Hat Linux
units
8.0
All
Linux
CLOSED
CURRENTRELEASE
low
low
---
1
vader
harald
petrosyan
benl
Bug Fix
---
2003-11-09 19:03:03
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oldest_to_newest
780400
0
vader
2002-12-17 14:19:10 +0000
Description of problem:
The 'units' package description states that the program "can only handle
multiplicative scale changes" whereas the man page states that that is not the
case, and even gives an example (which works) to contradict that.
Version-Release number of selected component (if applicable):
1.74-4
How reproducible:
rpmquery -i units
Actual results:
"Units can only handle multiplicative scale changes (i.e., it can not tell you
how to convert from Celsius to Fahrenheit, which requires an additive step in
addition to the multiplicative conversion)."
Expected results:
"The `units' program can handle multiplicative scale changes as well as
nonlinear conversions such as Fahrenheit to Celsius."
447115
1
mitr
2002-12-18 12:55:03 +0000
Farenheit to Celsius definitely _is_ linear. It's just y = Ax +B.
527898
2
vader
2002-12-18 18:57:56 +0000
The point, in case it wasn't clear enough already, is that the two texts are
contradictory, and that the package description would lead one to believe that
it cannot be used for that type of conversion -- whereas it can.
443108
3
harald
2003-01-07 16:01:35 +0000
fixed in 1.80-3
468383
4
petrosyan
2003-05-24 19:25:52 +0000
A linear transformation T has the property that T(x+z)=T(x)+T(z).
(That's part of the definition of linear transformation.) If you try
your form T(x)=ax+b you'll find that T(x)+T(z)=ax+b+az+b=a(x+z)+2b but
T(x+z)=a(x+z)+b. So the property does NOT hold, and hence the form
T(x)=ax+b is NOT a linear transformation. The Fahrenheit to Celsius
transformation y=ax+b is an affine transformation.
http://mathworld.wolfram.com/LinearTransformation.html
http://mathworld.wolfram.com/AffineTransformation.html
http://algebra.math.ust.hk/matrix_linear_trans/02_linear_transform/lecture3.shtml
http://www.instantweb.com/foldoc/foldoc.cgi?affine+transformation
545537
5
harald
2003-08-05 08:03:04 +0000
*** Bug 100404 has been marked as a duplicate of this bug. ***