Problem initialising with ODE45

2012 9 17
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更新时间：2021 8 20
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Hello all,
I've got a problem with ODE45. Essentially when I call my derivative function "TANKONEDIM", ODE45 doesn't seem to initialise the parameter T (which is a 20 element column vector) and so the simulation falls over. I've checked that all the matrices etc are coming out as the correct size...
Any ideas?
Best
Pete
function [t T] = TankSolver(T0,T,TankGeometry,TankVolume,Outflow,Tamb,Qe);
tspan = [0 3600]; [t T] = ode45(@TANKONEDIM,tspan,T0); end
function dTdt = TANKONEDIM(T,T0,NodeCount,TankVolume,TankGeometry)
global Heat_Matrix
global HeatSources
dTdt = Heat_Matrix*T+HeatSources
end

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Walter Roberson
Walter Roberson 2012-9-17
Why is your TANKONEDIM function expecting NodeCount, TankVolume, TankGeometry to be passed to it? You do not use those parameters and you do not pass them in in the ode45 call.
Peter
Peter 2012-9-17
The NodeCount, TankVolume and TankGeometry arguments are redundant but I was thinking they might be required once I've got the solver working... atm they're just place holders...
Peter
Peter 2012-9-17
Ah, just realised that I didn't have the time variable in there which prevented it from working!
Apologies
Pete

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Peter
2012-9-17

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