Hi all.

I would like to ask an expert to point out the cause of the error

detected in the computation shown below.

Thanks in advance.

S.T.

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off int;

depend nu,r;

depend nu,z;

depend psi,r;

depend psi,z;

on combineexpt;

expre := 2*e**( - 2*nu + 2*psi)*(

- df(nu,r,2) - df(nu,z,2) + df(psi,r,2) - df(psi,r)**2

+ df(psi,r)*r**(-1) + df(psi,z,2) - df(psi,z)**2);

- 2*nu + 2*psi

expre := 2*e *( - df(nu,r,2) - df(nu,z,2) + df(psi,r,2)

2 -1 2

- df(psi,r) + df(psi,r)*r + df(psi,z,2) - df(psi,z) )

factorize num expre;

2*psi 2*psi 2*psi

***** - 2*e *df(nu,r,2) - 2*e *df(nu,z,2) + 2*e *df(psi,r,2)

2*psi 2 2*psi -1 2*psi

- 2*e *df(psi,r) + 2*e *df(psi,r)*r + 2*e *df(psi,z,2)

2*psi 2

- 2*e *df(psi,z) invalid as polynomial

***** Continuing with parsing only ...

quit;