Error, (in plot/iplot2d/levelcurve) could not evaluate expression
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Description
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This error occurs if Maple cannot evaluate the given expression to a numeric value when graphing with plots[contourplot].
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Examples
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Example 1
In this example, the wrong variable is used in the expression to be plotted.
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Solution:
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Example 2
In the following example, the first argument passed to contourplot is a complex value, instead of a real value.
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Solution:
To correct the error, pass only the real part of the complex value as an argument to contourplot.
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