# CYANA Function: lda

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## Synopsis

**lda( integer) = integer**

## Description

Number of the last atom that is affected by a change of dihedral angle n.

For the dihedral angle with the given index this function returns the index of the index of the last atom that is affected by a rotation of this dihedral angle. This function returns na+1, i.e. the number of atoms plus 1, for backbone dihedral angles and for fixed dihedral angles.

Optionally, the *integer* dihedral angle index can be replaced by a
string consisting of the dihedral angle name and the residue number,
separated by a blank or a period, **.**.