Keep nodes.
node=keep(node,1:10)
node=node.keep(1:10)
KEEP will keep nodes from the IMAT_NODE object NODE. If ID is numeric, it must contain the node ID(s) to keep. If it is logical, it contains the indices into NODE of the node(s) to keep.
>> fem=readunv('fem_file.unv')
fem =
IMAT_FEM Finite Element Model
1 coordinate system
30 nodes
10 elements
3 tracelines
>> node=fem.node;
>> node=node.keep(1:3);
>> node=keep(node,node.id==3);