# Graph - Optimization/Convergence Summary

The Graph button inside the Summary window allows you to open a simple X-Y plot and
browse the dynamic convergence of various variables displayed in the Summary
window.

The Graph function is available only when convergence data are available, and it provides a graphical way to visualize the convergence process.

Hovering over any point on the graph displays the iteration number and the tracked variable value and possibly grid/element identification number if applicable.

Four buttons at the left bottom corner of graph window enable you to:

- (Lin) or (Log) switch between Linear and Log-Linear plot. In Log mode the sign of traced variable is removed (all values are treated as non-negative)
- (<) and (>) zoom plot on the left or right range of values
- (x) reset to full range of values