Region

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region(regTag[, '-ele', e1, e2, ...][, '-eleRange', e1, e2, ...][, '-node', nd1, nd2, ...][, '-nodeRange', nd1, nd2][, '-rayleigh', alphaM, betaK, betaKinit, betaKcomm][, 'getNodeTags'][, 'getConnectedEleTags'][, 'getEleTags'][, '-mass', m1, m2, ...]) ¶

an enhanced region command

Parameters:	* regTag (int) - a predefined or new region tag.
	* '-ele', e1, e2, ... (int) – the region is defined by elements e1, e2, .... If no tag is given, then all elements are added.
	* '-eleRange', e1, e2, ... (int) – the region is defined by elements in the range [e1, e2].
	* '-node', nd1, nd2, ... (int) – the region is defined by nodes nd1, nd2, .... If no tag is given, then all nodes are added.
	* '-nodeRange', nd1, nd2, ... (int) – the region is defined by nodes in the range [nd1 nd2].
	* '-rayleigh', alphaM, betaK, betaKinit, betaKcomm (float) – arguments as in rayleigh command.
	* '-getNodeTags' (str) – return all node tags in the region.
	* '-getConnectedEleTags' (str) – return all elements that connect to all nodes in the region.
	* '-getEleTags' (str) – return all elements that are added by mesh/remesh commands.
	* -mass', m1, m2, ...' (float) – set the nodal mass for all nodes in the region.
Returns:	a list of node or element tags if ‘-getNodeTags’, ‘-getConnectedEleTags’, ‘-getEleTags’ are specified, otherwise, returns None.
Return Type:	list(int) or None