How to choose tspan?
in [Matlab]
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From: Ib Al on 22 Mar 2010 07:50 Hi Steve I would to calculate solar radition absorption in some materials during a year This need to solve ODE and PDE simulateneously. So in general or in my case , depend on what should i choose the tspan ? is it in terms of moths, days, hours because if i change the tspan the results change so i am confused about choosing the tspan Thanks alot Ib
From: Ib Al on 24 Mar 2010 09:34 Any ideas?
From: Steven Lord on 24 Mar 2010 09:41 "Ib Al" <uk(a)rafha.com> wrote in message news:ho7lhd$m1s$1(a)fred.mathworks.com... > Hi Steve > > I would to calculate solar radition absorption in some materials during a > year > This need to solve ODE and PDE simulateneously. > > So in general or in my case , depend on what should i choose the tspan ? > is it in terms of moths, days, hours > > because if i change the tspan the results change so i am confused about > choosing the tspan First, if you reply QUOTE SOME (not all) of the message to which you're replying. Just saying "Any ideas?" means that people need to go back to your previous message to figure out what you're asking about, which in my experience DRASTICALLY reduces the chances of someone responding. Anyway, the choice you make for tspan depends on what type of problem you're trying to solve. If your analysis requires the value of the solar radiation absorption on a monthly basis, have your tspan include the time of the first day of each month (for example.) If you instead need the value every second, then specify that (and hope that you have enough memory to store that matrix.) NO ONE ELSE can offer a suggestion for the choice you should make for your situation, simply because you're the only one who knows what you want. -- Steve Lord slord(a)mathworks.com comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ
From: Ib Al on 3 Apr 2010 08:15
"Steven Lord" <slord(a)mathworks.com> wrote in message <hod4p1$lbj$1(a)fred.mathworks.com>... > > "Ib Al" <uk(a)rafha.com> wrote in message > news:ho7lhd$m1s$1(a)fred.mathworks.com... > > Hi Steve > > > > I would to calculate solar radition absorption in some materials during a > > year > > This need to solve ODE and PDE simulateneously. > > > > So in general or in my case , depend on what should i choose the tspan ? > > is it in terms of moths, days, hours > > > > because if i change the tspan the results change so i am confused about > > choosing the tspan > > First, if you reply QUOTE SOME (not all) of the message to which you're > replying. Just saying "Any ideas?" means that people need to go back to > your previous message to figure out what you're asking about, which in my > experience DRASTICALLY reduces the chances of someone responding. > > Anyway, the choice you make for tspan depends on what type of problem you're > trying to solve. If your analysis requires the value of the solar radiation > absorption on a monthly basis, have your tspan include the time of the first > day of each month (for example.) If you instead need the value every > second, then specify that (and hope that you have enough memory to store > that matrix.) NO ONE ELSE can offer a suggestion for the choice you should > make for your situation, simply because you're the only one who knows what > you want. > > -- > Steve Lord > slord(a)mathworks.com > comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ > Hi Steve Regardless the introduction, you have added useful information. Thanks alot |