ContourPlot::plnr

DensityPlot::plnr

Plot::plnr

Generated when the first argument in ContourPlot, DensityPlot, or Plot does not evaluate to a machine-size real number at the indicated point.

The cause of this error can often be determined by temporarily assigning the indicated value to the plot variable, evaluating the first argument of the plotting function, and observing whether or not the result is a real number.

If Plot is used to plot a list of functions, that list should appear explicitly as the first argument in Plot or should be introduced using Evaluate or other means.

Examples