Hi Jan,
janI schrieb:
On 19 August 2013 12:24, Regina Henschel <rb.hensc...@t-online.de> wrote:
[..]
But for both kind of testing there exists a problem with "expected
values". For example, calculation of PMT needs expm1 and log1p, or
calculation of LINEST needs lot of matrix calculation. It is not impossible
to calculate this with Java, but who will do it? And when you use constant
expected values, from where do you get them and how to ensure, that they
are valid?
Just one simple question, how do you do manually today ? use the same
constants.
I use my MuPad 3.1 and sometimes calculate values on
http://www.wolframalpha.com/
Or I compare the values to those from Gnumeric and Excel. Having the
same value does not mean that they are correct, but the other way round,
having different values means that I have to investigate it.
We should not try to invent a total new road, just do what we do today more
efficiently.
Suggestions?
Kind regards
Regina
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