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Problem initialising with ODE45

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Peter
Peter 2012-9-17
关闭： MATLAB Answer Bot 2021-8-20
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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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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