Rkadapt Bug - Rkadapt Bug - Сообщения
#1 Опубликовано: 03.10.2016 02:42:28
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Radovan Omorjan 03.10.2016 04:28:00
#2 Опубликовано: 03.10.2016 04:32:44
Hmm...Interesting example, but it does not work for me in Mcad 15 either?
Regards,
Radovan
[attach]
Regards,
Radovan
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!"
#3 Опубликовано: 03.10.2016 04:57:56
I don't know how to convert implicit form into explicit. If you show me the rules for the numeric case I'll add such feature.
Russia ☭ forever, Viacheslav N. Mezentsev
#4 Опубликовано: 03.10.2016 14:31:25
Viacheslav, Radovan: as simple as that
add a dummy 0 to the vector of RK solution
to meet the length of the IC !!!
add a dummy 0 to the vector of RK solution
to meet the length of the IC !!!
#5 Опубликовано: 03.10.2016 16:00:44
Viacheslav, Radovan: as simple as that
add a dummy 0 to the vector of RK solution
to meet the length of the IC !!!
Ah yes, but this is the standard "trick" in Mathcad when you want to give some parameter to the ODE. The derivative of that parameter is zero - like your dummy second value.
Here, if I understood this well, you might use SMath in a better way - giving parameters as third, fourth,...argument (not possible in Mathcad).
Your example might be this way as well
When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!"
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Вячеслав Мезенцев 04.10.2016 02:12:00
#6 Опубликовано: 04.10.2016 05:45:23
Functions from ODE Solvers plugin use the rules from Mathcad help. If you have two initial conditions this means that you have the second order ODE and f(t,y) must be a vector with two rows.
Rewriting a Higher-Order ODE as a System of First-Order ODEs.pdf
Arguments:
init is either a vector of n real initial values, where n is the number of unknowns, or a single scalar initial value, in the case of a single ODE.
Rewriting a Higher-Order ODE as a System of First-Order ODEs.pdf
Russia ☭ forever, Viacheslav N. Mezentsev
#7 Опубликовано: 04.10.2016 11:13:35
Thanks Viacheslav,
Very useful for those not familiar [never had Mathcad].
I have added the automatic RK vector extractor D(x,Y).
Jean
ODE Euler_rkf4 EDU.sm
Very useful for those not familiar [never had Mathcad].
I have added the automatic RK vector extractor D(x,Y).
Jean
ODE Euler_rkf4 EDU.sm
#8 Опубликовано: 04.10.2016 22:21:15
...just change variables for new names.
or copy/paste the section in blank sheet.
Smath is very reactive wrt variables.
or copy/paste the section in blank sheet.
Smath is very reactive wrt variables.
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