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DT, you're talking about a linear map or transformation between two
vector spaces which, in English, is linear if and only if it is
compatible with the vector space operations of vector addition and
scalar multiplication. Fine. But say linear *function* and I still
think of f(x)= mx +b which, by the way, is not just in my head. There
are tens of thousands (probably many more) "pre-linear algebra"
textbooks in the U.S. that define a linear function precisely in that
manner. Not to mention most software. Look in Excel, for example, or
in statistical software under linear regression. Maybe it's different
in Greece. This again makes my point that it's much better to discuss
practice than theory.
Mark
--- In amibroker@xxxxxxxxxxxxxxx, "DIMITRIS TSOKAKIS" <TSOKAKIS@xxxx>
wrote:
> --- In amibroker@xxxxxxxxxxxxxxx, "MarkF2" <feierstein@xxxx> wrote:
>
> >
> > But to me, a *linear* function is a function of the form f(x) =
mx +
> > b, where m and b are constants.
> Mark,
> A linear transformation has some international definition, do not
> replace it with what is linear for you...
> See ANY textbook as
> http://algebra.math.ust.hk/vector_space/03_linea
r_trans/lecture1.shtml
> http://www.ping.be/~ping1339/lintf.htm
> A practical example :MACD is a linear transformation, RSI is not
> BTW, linearity does not imply coherence, see my reply to Franco.
> Let us use definitions to keep the discussion serious, please...
> DT
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