hi. i'm trying to use custom equation on cftool on a graph i'm working on.

hi. the custom equation for the cftool is not a regular y = f(x) type of equation. it is the carreau-yasuda model of shear thinning. the equation is (<http://users.rowan.edu/~hesketh/0906-402/COMSOL/Non-newtonian%20fluids.pdf)>. also there are 2 parameters in the equations that i need the cftool to find. how do i do this? the unknowns in the equation are 'lamda' and 'n'.