Hammerstein-Wiener model plot offers an interface to explore the characteristics of the model on a block-by-block basis. A Hammerstein-Wiener model is a series connection of a linear model block with static nonlinearities at it input and output channels. The figure shows this block-diagram at the top, containing three clickable blocks: u_NL (input nonlinearity), Linear Block and y_NL (output nonlinearity).

• Click on the block labeled "u_NL" (the leftmost block) to view a plot of the input nonlinearities as a function of input data.
• Click on the block labeled "Linear Block" (the middle block) to view the response plots of the embedded linear model. The response plot types available are: step, bode, impulse and pole-zero map.
• Click on the block labeled "y_NL" (the rightmost block) to view a plot of the output nonlinearities as a function of its inputs. Note that an input to the output nonlinearity block is the output of the embedded linear model.

Plots for I/O nonlinearity blocks:
The plots are shown for one channel at a time. The popup menu above the plot axes allows the selection of channel whose nonlinearity is being viewed. Options menu option – “Set input range...” allows setting the limits of x-axis of the plot. Zoom and Pan options are also available from the Style menu to explore the shape of the nonlinearity.

Plots for Linear Block:
The linear block represents the embedded linear model in the Hammerstein-Wiener model. Exploring this block amounts to viewing its response plots in time and frequency domains (as available for any linear model). In the view for this block, two popup menus are offered: one for selecting the I/O pair whose response is being viewed and the other for selecting the type of plot: Step, Bode, Impulse or Pole-Zero Map. Select an I/O pair and a plot type using these popup menus. Time span may be set (available from the Options menu) for the Step and Impulse plots, while Frequency range may be set for the Bode plot.