
On entry,  ${\mathbf{N}}\le 2$, 
or  ${\mathbf{NSYM}}<1$, 
or  ${\mathbf{DMIN}}<0.0$, 
or  ${\mathbf{DSTEP}}\le 0.0$, 
or  ${\mathbf{ORIENT}}\ne \text{'N'},\text{'S'},\text{'E'}$, or 'W', 
or  ${\mathbf{ORIENT}}=\text{'N'}$ or $\text{'S'}$, ${\mathbf{LENC}}<{\mathbf{NSYM}}$, 
or  ${\mathbf{ORIENT}}=\text{'E'}$ or $\text{'W'}$, ${\mathbf{LENC}}<{\mathbf{N}}$, 
or  the number of characters that can be stored in each element of array C is insufficient for the requested orientation. 
On entry,  ${\mathbf{DORD}}\left({\mathbf{N}}\right)<{\mathbf{DORD}}\left(i\right)$, for some $i=1,2,\dots ,{\mathbf{N}}1$. 