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Thus far I have my function set up essentially like this:  s = NDSolve[{ y'[t] == k*y[ x ] + m*z[ x ]*a[ x ], a'[ x ] == -c*a[ x ] + b*z[ x ]*y[ x ], y[0] = .3, a[0] =.01}, {y,z,a}, {x,0,10}] (also my variable names have subscripts) ...