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Warning: unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct
Error: empty plot
Description | |
This warning occurs when you create a Maple plot without points, curves, or surfaces. In the warning message, "function" refers to the function being plotted (expressed as an algebraic expression or procedure) and "region" refers to the plotting domain.
Verify that you are using the correct syntax for the plotting command and that the function values are real numbers in the specified region. |
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Example 1: 3-D plot of a function
Solution 1: Specify
Solution 2: To plot the function
Example 2: Expression with non-real values
In the range given, the solutions for the function Solution: Change the range to one for which the expression is real-valued.
Alternatively, to plot in the complex plane, use plots[complexplot].
Example 3: Additional parameter not given numerical value
The expression to be plotted includes two unknowns, but plot expects only one unknown.. Solution 1: To plot this expression, replace
Solution 2: To create a 3-D plot of this expression, use plot3d and specify a range for
Example 4: Independent variable not specified
Solution: To plot this function, explicitly assign the range to
Important: Previously in Maple 10, you had to specify a range when entering a plot.
Here, plot(f) is interpreted as operator-form and a default range of -10..10 is assumed. The error occurs because Example 5 (Maple 11 and later): You can enter a plot without having to specify a range. Here,
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