) plot to graph a scalar quantity as a function of time or a parameter. Add a Color Expression or Filter subnode as needed. Right-click a 1D Plot Group or Polar Plot Group to add this plot type.) plot to graph a scalar quantity as a function of time or a parameter. Add a Color Expression or Filter subnode as needed. Right-click a 1D Plot Group or Polar Plot Group to add this plot type.
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Go to Common Results Node Settings for links to information about these sections: Data, Title, and Coloring and Style. Also see the section Expressions and Predefined Quantities.
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This section is only available if the Two y-axes check box is selected in the Plot Settings section of the parent 1D Plot Group node’s Settings window.
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Click the Replace Expression (
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Click the Add Expression (
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Solution number to use the solution numbers as the x-axis data (or θ angle data for polar plots) for an eigenvalue solution or for a parametric solution with more than one parameter.
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Frequency spectrum to have COMSOL Multiphysics compute the number of frequencies and the frequency range based on the FFT (fast Fourier transform) of the time-dependent solution. The frequency spectrum code assumes that the time range selected in the plot is a whole number of periods of a periodic function. (The transform is valid for all functions, but what you get corresponds to a periodic continuation of the function outside the chosen time range.)
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To specify these values manually, select the Number of frequencies check box and enter a value in the associated field (the default is based on the number of time samples), or
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Select the Frequency range check box and then enter the bounds of the frequency range in the Minimum and Maximum fields (in Hz). The FFT algorithm uses resampling based on linear interpolation. The x-axis shows the frequency (in Hz). By default, the y-axis shows the unscaled Fourier coefficients.
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Select the Scale check box to scale the values on the y-axis so that their magnitude reflects the magnitude of the original signal. The values then have the same unit as the input data for the FFT. The y-axis title includes the unit if all expressions represented on the y-axis have the same unit. The scaling makes the magnitude at 0 Hz equal to the bias or DC component of the original signal. For a pure sinusoid, the scaled value is the peak magnitude divided by the square root of 2 (
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Phase to specify a range of phase angles for the x-axis data. The default for the Phase is range(0,0.5,2*pi) (0–360 degrees in steps of 0.5 rad). Select a Unit for the phase angle.
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Parameter value to use the x-axis data (or θ angle data for polar plots) stored in the solution for a parametric solution with a single parameter.
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Time to use time as the x-axis data (or θ angle data for polar plots) for a time-dependent solution.
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If Inner is selected, and for time-dependent studies, the Times steps are plotted on the x-axis and one line per parameter is included in the graph (as listed in the Data>Parameter values section on this page).
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If Outer is selected, one line in the graph is plotted for each inner solution and the Parameter values are plotted on the x-axis.
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