More on "memory exhausted..."

[J Stasko]

My version of octave is 3.4.0, it is the MacPorts build.  I am running Snow Leopard, if that matters, 10.6.8.  I do not have the 64 bit enabled.  I do not see a memory spike, either.  I only have 2GB RAM on this monster.  Does increasing swap space help?  The function which I am calling is the following:

function y=heat4(u)

   global A dx dy dt q Ulast dbg

   y = (A .* del2(u,dx,dy)) + q - (u - Ulast) / dt;

endfunction

Referring to the heat equation of http://www.wikipedia.org/Heat_equation under heading "Internal heat generation"...

\begin{equation}

\frac{\partial u}{\partial t} = \alpha \nabla^2 u + q

\end{equation}

where A is $\alpha$, (u - Ulast) / dt is $\frac{\partial u}{\partial t}$, and the rest is the same.

Thank you for your time and help.