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Error, (in plots/implicitplot) invalid input: the following extra unknowns were found in the input expression

 

Description

Examples

Description

The implicitplot command computes the two-dimensional plot of an implicitly defined curve.

 

The invalid input: the following extra unknowns were found in the input expression error occurs when an unknown variable in the first argument is passed to the implicitplot command.

Examples

withplots:

 

Example 1

Lowercase pi is used instead of uppercase Pi.

implicitplotx2+piy2=1,x=0..1, y=0..1

Error, (in plots/implicitplot) invalid input: the following extra unknowns were found in the input expression: {pi}

 

Solution:

implicitplotx2+Piy2=1,x=0..1, y=0..1

 

Example 2

In the following example, an extra space has been entered between sec and x2 + y2.

implicitplotsec x2+ y2,x=0..1, y=0..1

Error, (in plots/implicitplot) invalid input: the following extra unknowns were found in the input expression: {sec}

 

Solution:

Remove the extra space between sec and x2 + y2.

implicitplotsecx2+ y2,x=0..1, y=0..1

Example 3

In the following example, the implicitplot command is used incorrectly to plot an equation in three variables.

implicitplotx+22+y+22+z+22=9,x=5..5,y=5..5,z=5..5

Error, (in plots/implicitplot) invalid input: the following extra unknowns were found in the input expression: {z}

 

Solution:

Plot the equation in three variables using the plots[implicitplot3d] command

implicitplot3dx+22+y+22+z+22=9,x=5..5,y=5..5,z=5..5

See Also

plots[implicitplot]

plots[implicitplot3d]