Out of Memory Error when Copying

Hello,

I have a function which symbolically solves for a set of differential equations and writes them out to a text file. Before this, I have always been able to copy/paste these equations in the text file into a function called by ode45 which solves the system of differential equations. However, I'm running into an example where I get an error saying

Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space

when I try to copy. I presume this is because the symbolic equations are too long. Does anyone have any suggestions for how to get around this copy error?

Thanks, Kevin