a well-known problem: Out of Memory during the ode process!

Hi everyone,

I'm trying to run a model using ode113 with 5252 state variables, the solver works pretty well in predefined time interval but at the end no result matrix can be generated. Until now I have tried to use @odeplot to plot just 2 of these 5252 variables which I need but I still facing the problem. I use a 64-bit Windows and MATLAB version running with 16 GB RAM. Any further suggestion?

[Steven Lord]

What's your tspan vector look like? If it's a vector with more than 2 elements, the ODE solver will try to return a length(tspan)-by-5252 matrix of values of the solution of your system of ODEs. Since you implied ODE113 throws an OOM error when it is trying to return, I suspect you have an extremely long tspan vector and allocating the output is what's running out of memory.

Answer 1

[Jan]

If the solver works successfully, post the code, which causes the error. We cannot guess the reason without seeing the code.

Beside this, the general rules can be recommended - search in the forum for "out of memory":

• Install more RAM
• Check your code for typos: rand(1e6) does not create a vector
• Use a 64 bit Matlab and OS
• Clear variables, which are not used anymore
• Close other programs
• Install more RAM
• Prefer a a struct of arrays instead of an array of structs
• Re-use arrays
• Install more RAM
• Use the smallest possible data type, e.g. uint8 instead of double.
• Install more RAM