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Visualize gain surface as a function of scheduling variables

`viewSurf(GS)`

`view(GS,xvar,xdata)`

`view(GS,xvar,xdata,yvar,ydata)`

`viewSurf(`

plots
the values of a 1-D or 2-D gain surface as a function of the scheduling
variables. `GS`

)`GS`

is a tunable gain surface that
you create with `tunableSurface`

. The plot uses
the independent variable values specified in `GS.SamplingGrid`

.
For 2-D gain surfaces, the design points in `GS.SamplingGrid`

must
lie on a rectangular grid.

`view(`

plots
the gain surface `GS`

,`xvar`

,`xdata`

)`GS`

at the scheduling-variable
values listed in `xdata`

. The variable name `xvar`

must
match a scheduling variable name in `GS.SamplingGrid`

.
However, the values in `xdata`

need not match design
points in `GS.SamplingGrid`

.

For a 2-D gain surface, the plot shows a parametric family of
curves with one curve per value of the other scheduling variable.
In the 2-D case, the design points in `GS.SamplingGrid`

must
lie on a rectangular grid.