Inconsistent behaviour of random() and Random.N()

Inconsistent behaviour of random() and Random.N() - Messaggi

#1 Pubblicato: 28/01/2020 20:04:24
Martin Kraska

Martin Kraska

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I just came across a nasty difference between random(x) and Random.N(0,x) (the first being native SMath, the second from the Statistical Tools plugin).
If you store random(x) in a variable, the function is called each time the variable is used. If you do that with Random.N(), then a fixed value is stored at definition time, as if there was an internal eval() used.

If you want a fixed value when using random(), then you have to use eval().

The behavour of random() puzzled me when preparing an online worksheet , where I had to fall back to random().

Yet, when remembering that assignment is just storage of an expression with taking into account existing definitions but not doing any computation, then random() behaves consistent and Random.N() does not.

The worksheet would look better without eval() and I can't expect third party readers to understand why it is there.

ran.png
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Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9
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sergio 29/01/2020 06:36:00
#2 Pubblicato: 29/01/2020 08:58:01
Jean Giraud

Jean Giraud

983 apprezzamenti in 6.866 post.

Gruppo: User

Wrote

The behavour of random() puzzled me when preparing an online worksheet , where I had to fall back to random().


Try this Martin, it may work in your SS 7251.
Cheers ... Jean

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