how to see rise time,settling time of simulink graph for fuzzy controlled output??????

for normal simulink graph i have saved the graph data to workspace by using structure with time.variable name is a ,in editor i typed stepinfo(a.signals.values,a.time).its showing every values but for fuzzy graph its showing Attempt to reference field of non-structure array.

[Walter Roberson]

What does class() of the variable show?

[mukund sahay]

In format its showing array...