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Dans un courrier daté du 14/12/98 06:17:59 Heure d6iver Pari59 Madrid,
jimo@xxxxxxxxxx a écrit :
>
> The TS 4 docs describe the trig functions without saying whether
> they use degrees or radians, one of the first questions a user of
> trig functions wants answered. There is, however, an example in
> one of the descriptions, which implies (if memory serves) radians.
> But, no, when you actually test the things with print statements,
> it turns out that they use the opposite of what the docs imply.
>
You should check again the EL manual:
( TS4 (c) 1997, 334 pages for this manual)
Page 288, Sine function
....
Example:
Sine(Value1) Assuming Value1 is 8 degrees, returns 0.139173100, the sine of
value1.
We may assume that IF the example is given in degrees, THEN thesine function
should accept degrees.
Even if it was not written a previous version, the first thing to do was to
print sine(90) and see what happens.
This is the basis of the scientific method.
When there is a doubt, you need to experiment..
When something obvious is not writen, you may assume that the obvious meaning
was intended.
There are thres units for angles:
Degres
Grades
Radians
Degres are widely used in most fields ( industry, elementary geometry, because
of the properties of the 360 number on the trigonometric circle, yielding to
remarquable integer numbers for remarquable angles - 30,45,60,90°.... )
Grades are the less used (they were an attempt to make angles measurements
compliant with the decimal /metric system).
Radians are used in higher level of mathematics ( geometry, periodic
trigonometric functions, signal processing) that is not the target of basic
technical analysis.
Degres are the obvious units for anyone.
> They've been that way since at least TS 3.0, and no amount of
> telling Omega of the problem produces a fix. I even offered to
> Bill Cruz, back in 1994, to proofread the next galleys of his
> manuals, thinking in three hours I could eliminate several thousand
> obvious typos, repeated passages, etc., and do us all a favor.
> Well, you can imagine Bill's response... :(
>
> That's why we started this list.
>
It has been proven useful in more intersting cases.
Sincerely
-Pierre Orphelin
www.sirtrade.com
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