
On entry,  ${\mathbf{JCEVAL}}\ne \text{'N'}$, $\text{'A'}$ or $\text{'D'}$, 
or  ${\mathbf{NEQ}}<1$, 
or  ${\mathbf{ML}}<0$ or ${\mathbf{ML}}>{\mathbf{NEQ}}1$, 
or  ${\mathbf{MU}}<0$ or ${\mathbf{MU}}>{\mathbf{NEQ}}1$, 
or  ${\mathbf{NEQ}}>{\mathbf{NEQMAX}}$, 
or  ${\mathbf{NJCPVT}}<{\mathbf{NEQMAX}}$, 
or  ${\mathbf{NWKJAC}}<\left(2\times {\mathbf{ML}}+{\mathbf{MU}}+1\right)\times {\mathbf{NEQMAX}}$. 