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Modifying the Plot

You can use any of the plot editing toolbar buttons to change the properties of your plot.

Analysis Parameters are parameters that apply to the displayed analyses. To display them, right-click in the plot area and select Analysis Parameters from the menu. (Note that you can access the menu only if the Edit Plot button is inactive.) The following analysis parameters are displayed. (If more than one response is displayed, parameters applicable to each plot are displayed.) Not all of these analysis fields are displayed for all types of plots:

  • Normalized Frequency — if checked, frequency is normalized between 0 and 1, or if not checked, frequency is in Hz

  • Frequency Scaley-axis scale (Linear or Log)

  • Frequency Range — range of the frequency axis or Specify freq. vector

  • Number of Points — number of samples used to compute the response

  • Frequency Vector — vector to use for plotting, if Specify freq. vector is selected in Frequency Range.

  • Magnitude Displayy-axis units (Magnitude, Magnitude (dB), Magnitude squared, or Zero-Phase)

  • Phase Unitsy-axis units (Degrees or Radians)

  • Phase Display — type of phase plot (Phase or Continuous Phase)

  • Group Delay Unitsy-axis units (Samples or Time)

  • Specify Length — length type of impulse or step response (Default or Specified)

  • Length — number of points to use for the impulse or step response

In addition to the above analysis parameters, you can change the plot type for Impulse and Step Response plots by right-clicking and selecting Line with Marker, Stem or Line from the context menu. You can change the x-axis units by right-clicking the x-axis label and selecting Samples or Time.

To save the displayed parameters as the default values to use when Filter Designer or FVTool is opened, click Save as default.

To restore the default values, click Restore original defaults.

Data tips display information about a particular point in the plot. See Interactively Explore Plotted Data for information on data tips.

If you have the DSP System Toolbox™ software, FVTool displays a specification mask along with your designed filter on a magnitude plot.


To use View > Passband zoom, your filter must have been designed using fdesign or Filter Designer. Passband zoom is not provided for cascaded integrator-comb (CIC) filters because CICs do not have conventional passbands.

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