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Selection of entities

Some knowledge is necessary to efficiently select entities (nodes, points ..). As a golden rule in complicated situations never try to create a set just by ``adding'' the entities to the set (see qadd). It is much better to catch a bigger group which includes certainly the requested ones. Then display the set with the plot command and remove all unwanted entities with the qrem command. Entities are selected if at least one pixel of it is inside the selection rectangle. You might add all lower entities (as points for example) by typing ``comp set do'' to fully describe the contents of the set. This is necessary for example if you had selected surfaces and you want to move them in space. Only points have locations and therefore nothing will happen unless you completed the set by the related points with ``comp''.