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CAS.numer; denom; lcoeff; degree... ??!! [It's OK NOW ! :o)] - dg1969 - 02-14-2015 07:35 PM
I can't find a way to use lcoeff; degree; coeff in a home program... Code:
In my mind string inside CAS.cas_stuff("...") is the good practice ? these code doesn't work... Code:
RE: CAS.numer; denom; lcoeff; degree... ??!! - dg1969 - 02-14-2015 08:34 PM
I need these functions in a home program because i'd like to compute symbolicaly the phase \(\varphi\) of a transfer functions \(\dfrac{P(s)}{Q(s)}\cdot e^{-k\cdot s}\) initially placed in F0 to F9 var in term of 'X' in a FUNCTION APP like "froot" from CAS give me all roots of numerator and denom with multiplicity so : \(F(s)=K\cdot\dfrac{(s-r1)...(s-r_n)}{(s-p_1)...(s-p_m)}\cdot e^{-k\cdot s}\) with \(n \leq m\) \(\varphi=arg(F(i\cdot \omega) \) lcoeff(numer)/lcoeff(denom) give me \(K\) so first term of \(\varphi\) is known I can easily compute the major terms of the sum of \( \varphi\) : \(+/-m_i\cdot atan \dfrac{\beta_i-\omega}{\alpha_i}\) where \(\omega \) is the pulsation ; \(\alpha_i; \beta_i ;m_i \) are resp the real part the imaginary part and multiplicity of roots and poles of \(F(s)\) I need to test if an exp term is there to add the last term in the phase sum... Don't know how to parse yet... At the end I want to place these phase functions in F_i var's in term of 'X' for plot... I try these way to plot bode phase without +/- pi discontinuity... At the end I want to keep benefits of the function app plot facility (max, zero etc...) RE: CAS.numer; denom; lcoeff; degree... ??!! - Han - 02-16-2015 07:53 PM
(02-14-2015 07:35 PM)dg1969 Wrote: I can't find a way to use lcoeff; degree; coeff in a home program... Tried with the emulator, and everything works properly here for me. As for CAS.coeff("x^2+2,2") =>0 are you sure you didn't mean CAS.coeff("x^2+2","2") Notice the quotes around each argument (the second set of quotes is unnecessary since the 2 is not symbolic) RE: CAS.numer; denom; lcoeff; degree... ??!! [IT'S OK NOW !] - dg1969 - 02-16-2015 08:45 PM
Han. You are absolutely irreplaceable ! Thank you for your endless patience. I just found something you already knew. Integrated help does not give the exact syntax for the HOME side which is in fact different from the CAS side. In CAS side: Code:
but it is essential in the "home" side. The aid does not indicate expect for : Code:
so Code:
Code:
It's the same thing for other commands that I mentioned... Han, you know what ? You are my best cyber-friend :o) |