Index exceeds the number of array elements. Index must not exceed 751.
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Timothy Dunning
am 25 Nov. 2022
Kommentiert: Timothy Dunning
am 26 Nov. 2022
Trying to create a modelling script that will call a variety of modelling techniques to approximate a (relatively simple) ODE. z is the matrix that will store each value for the approximation as the simulation runs.
Here is the code that calls the modelling technique functions from other scripts:
function [t,z] = ivpSolver(t0,z0,dt,tend,dM)
% ivpSolver Solve an initial value problem (IVP) and plot the result
%
% [T,Z] = ivpSolver(T0,Z0,DT,TE) computes the IVP solution using a step
% size DT, beginning at time T0 and initial state Z0 and ending at time
% TEND. The solution is output as a time vector T and a matrix of state
% vectors Z.
% Set initial conditions
t(1) = t0;
z(:,1) = z0;
M(1)=2;
% Continue stepping until the end time is exceeded
n = 1;
while t(n) <= tend
% Increment the time vector by one time step
t(n+1) = t(n) + dt;
% Apply Euler's method for one time step
%[z] = stepEuler(z(:,n), dt, M, dM);
%Apply RK4 method for one time step
z(:,n+1) = stepRungeKutta(z(:,n), dt, M(n), dM);
if M(n)>0.5
M(n+1)=M(n)-(dM*dt);
end
n = n + 1;
end
running the code with the command: [t,z] = ivpSolver(0,[10;0],0.1,100,0.02); gives the aforementioned error arrising from line 14: z(:,n+1) = stepRungeKutta(z(:,n), dt, M(n), dM);. Is it not possible to create an array that is longer than 751 columns or is something else causing this error to be displayed?
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