On Sep 9, 2010, at 6:50 AM, Jan private wrote:
Hello Bernardo,
---------
If I understood your problem this script solve your problem:
q<-0.15 + c(-.1,0,.1)
h<-10 + c(-.1,0,.1)
5*q*h
[1] 2.475 7.500 12.625
---------
OK, this solves the simple example.
But what if the example is not that simple. E.g.
P = 5 * q/h
Here, to get the maximum tolerances for P, we need to divide the
maximum
value for q by the minimum value for h, and vice versa. Is there any
way
to do this automatically, without thinking about every single step?
There is a thing called interval arithmetic (I saw it as an Octave
package) which would do something like this.
I would have thought that tracking how a (measuring) error propagates
through a complex calculation would be a standard problem of
statistics?? In other words, I am looking for a data type which is a
number with a deviation +- somehow attached to it, with binary
operators
that automatically knows how to handle the deviation.
Thank you,
Jan
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David Winsemius, MD
West Hartford, CT
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