# Step size

### From Glossary

This is a scalar in an algorithm of the form:
where is the *direction vector*. After is chosen (nonzero), the step size is specified. One step size selection rule is line search; another is a fixed sequence, like

This is a scalar in an algorithm of the form:
where is the *direction vector*. After is chosen (nonzero), the step size is specified. One step size selection rule is line search; another is a fixed sequence, like