== Summary ==
Title / Description: Example of contour plot . Function f(x,y)= <math>\sin\left(\frac{\pi}{4}x\right) \sin\left(\frac{\pi}{4}y\right)</math> is plotted in the range <math>-10\le x\le 10,</math> <math>-10\le y\le 10.</math> Levels <math>f(x,y) = − 0.1</math> are shown wiht red lines. Levels <math>f(x,y) = 0.1</math> are shown wiht blue lines. After to generate the eps file, the image was converted to jpg format.

Author(s): Dmitrii Kouznetsov

Date created: 2008

Country of first publication: Japan

Source: Citizendium

== Licensing ==
{{Knowino:File licenses/CC-BY}}