Delete one or more data items. The index_range is a number (e.g. 3) or a range (-ra ... -ra, or -all). If index data_item_name is a nodal item (by example node or node_dof) then index_range can also be a geometrical entity (by example -geometry_line 1 or so), and the item will be deleted for nodes located on the geometrical entity.
In the example below element 1-10 and nodes 1-100 are deleted after some time in the calculation; this simulates dismantling a part of a structure somewhere in its lifetime. First, time steps with the total structure are taken; then a part of the structure is dismantled; then time steps with the remaining part of the structure are taken.
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control_timestep 10 ...
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control_data_delete 20 -element -ra -from 1 -to 10 -ra
control_data_delete 21 -node -ra -from 1 -to 100 -ra
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control_timestep 30 ...
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If an element or node is deleted, then also the corresponding records will be deleted. See also control_data_put.