User`s guide

28 Signal Processing Toolbox 5.1 Release Notes
28-10
Known Software Problem
FDATool and FVTool Pole/Zero Plot
In the FDATool analysis window, pole-zero plots do not display more than one
root at a given point and data markers cannot be displayed for these points.
FDATool and FVTool Magnitude and Phase Plot
In the Magnitude and Phase plot, you can use data markers only on the phase
curve.