Main integer parameters

The main integer parameters of the problem are specified in the name.i1 file on the IP line:

IP NELEM NNOD ITED 0 NGD 0 KPER NPSN 0 KSS

$\mathtt{NELEM}$	The total number of elements in the mesh, including any connector elements.
$\mathtt{NNOD}$	The total number of nodes in the mesh.
$\mathtt{ITED}$	The default value of the element type identification number, see the Reference Manual. It applies when the element type $\mathtt{ITE}$ is not specified in the element description. The default value is $\mathtt{ITED}=56$ for 3D problems and $\mathtt{ITED}=6$ for 2D problems.
$\mathtt{NGD}$	The default order of numerical integration for an element, $2\le\mathtt{NGD}\le4$. It applies when the integration order $\mathtt{NG}$ is not specified in the element description. The default value is $\mathtt{NGD}=3$.
$\mathtt{KPER}$	The periodicity key.
	$=0$	non-periodic mesh
	$=1$	periodic mesh
$\mathtt{NPSN}$	The number of nodes lying on the periodicity surface (for $\mathtt{KPER}=1$), or the number of nodes lying in the plane of symmetry (for $\mathtt{KPER}=0$).
$\mathtt{KSS}$	The 2D problem type key. For heat transfer problems, only the values $\mathtt{KSS}=0$ (plane problem) and $\mathtt{KSS}=2$ (axisymmetric problem) can be used.
	$=-1$	plane stress ($\sigma_{xz}=\sigma_{yz}=\sigma_{zz}=0$)
	$=0$	plane strain ($\varepsilon_z=0$)
	$=1$	generalized plane strain ($\varepsilon_z=\varepsilon_{z0}=\text{const}$.)
	$=2$	axisymmetric problem (the axis of rotation is the $y$ axis)

Note
Although the parameters in the fourth, sixth, and ninth positions are not currently used, the numbers 0 must still be formally specified.

Note
The IP line must be the first non-empty line in the input file. Lines containing only a comment are also considered empty lines.