How to use events command in dsolve/numeric for different points of...
My problem is How to use events command in dsolve/numeric for different points of independent variable? A simple...
View ArticleEvents in dsolve
HiI have a system of second order differential equation to be solved numerically. I would like to set up events to halt integration to find the values of phi when r(phi)=2/3 . Here is my...
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10 000 000
Event?January 2014: Pages of oldest Russian Maple Application Center have been opened 10000000 times.http://webmath.exponenta.ru/
View Articleobtaining the maximum value of a variable after using dsolve
Dear all,I have a question regarding the dsolve procedure in Maple. I'm trying to construct a neutron star model using the Tolman-Oppenheimer-Volkoff equation using a polytropic equation of state (EOS)...
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changing values of parameters within dsolve
Dear all,I'm trying to solve a system of two differential equations which depend on two parameters, which I call "K" and "polytrope" in my worksheet. The two differential equations are for the density...
View ArticleRound-off and simple triggers
Can anyone explain me how to use the next feature that you can find in ?dsolve,numeric,events,Round-off and simple triggers or refer me to a previous answer that explain this: This is primarily...
View ArticleThe solution returned by dsolve seems to be lost
Hi everybody,I use dsolve(..., numeric, events =[...], parameters = [...], range=0..TMAX) to solve a parameterized system of 2 ODEs (unknowns x(t) and v(t)). The solution over the whole range [0, TMAX]...
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How to model a bouncing ball through event handling?
I wish to model the motion of a ball that bounces up and down in a vertical line, and whenever it hits the ground, it bounces back with only a fraction of the collision speed.We expect that the...
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Opposite of infinitebound in Minimize (Optimization)?
I have multiple curves of the same function with different initial conditions, trying to find the most suitable initial condition (for initial cond's less than the optimal one the function breaks down...
View ArticleStop the simulation according to event
I do the numerical simulation withlp:=dsolve(....,type = numeric, range = ta .. te)The simulation stop at t=te .I want to stop the simulation when e.g. x(t) < 0How can i do it ?
View Articledsolve with event
Why this event dose'nt work ? S(t) is a state , a parameter dsolve(...,numeric,events = [[[s(t), a*arcsinh(2/a) < s(t)], halt]]);
View Articlefetch the dsolve event time
1) How can i get the event time. This example 0.69313.2) I don't want to see the Warning.How can i do it? Warning, cannot evaluate the solution further right of .69314729, event #1 triggered a halt
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dslove trigger time with rhs(SOL[1](last)
I want to fetch the trigger time. I use rhs function. > > Warning, cannot evaluate the solution further left of -.49995006, event #1 triggered a halt > > (1)> (2)> Download RHS_TEST.mw
View Articledsolve/events vs piecewise function
I was wondering how Maple cope with piecewise functions during forward integration and if it's preferable to use dsolve events option in place of defining a piecewise discontinuos function.As far as I...
View ArticleUsing dsolve events to avoid singularities in runge-kutta integration
Hey there,I'm trying to numerically intergrate a function s(K,i,j) dK using runge kutta over a 2D grid of i,j values. Essentialy, performing the same sort of integral many different times for slightly...
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Why doesn't dsolve[events] return the good results?
Hi, Why extracting the features of the events doesn't return the good results when executed within a loop (see the pink test) ? Thanks in advance.PS: please, spare me replies of the type "you can...
View ArticleHow can I code the eventfired option in a numeric dsolve containing an event?
The help page for dsolve,numeric,events says that "A call to a procedure-form dsolve numeric procedure" can return the time that one or more events fired by coding the eventfire option.I do not know...
View ArticleA special issue on dsolve numeric
Hi everybodyMy question comes back to singularities within a differential equation.Consider a Non-Linear differential equation of y(x), say Eq1.When we solve this with dsolve ({Eq1, ICs}, type=numeric)...
View ArticleIf (a,b,c) syntax in events action
The dsolve numeric events syntax requires the use of If(a,b,c) rather than the usual if then else syntax. Also, the possible action parts of an event are truly mysterious as are discrete variables. Has...
View Articledsolve event continue the simulation after "halt"
I want to contnue the simulation from the point (time) that the event accure how can I do it ?
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