# Drawing Contour Lines In MatLab Effectively(Illustrated Expression)

Contour lines are used generally in most disciplines. But in land surveying, it has very important place. In Matlab, you can obtain contour lines as in land surveying and mapping in geography. In here, we explain how to obtain contour lines in Matlab with ‘contour()’ command.

### How To Use ‘contour()’ Command In Matlab?

Use of contour() command to obtain contour lines is very easy in Matlab like above. To start to create contour lines, you need to create 3D mesh domain for contour graph with meshgrid() command. In this meshgrid() commandi you create both 2 of vectors that will be used as variables in polynomials, and axes in 3D domain to show graphs on it.

We use meshgrid() command as shown by red arrow above to obtain 2 of vectors and 3D domain in Matlab. Then we created a polynomial, which will be the third axis in 3D domain and also represent the surface of curves in 3D graph as shown by green arrow.

To obtain contour lines, type the vector variables inside contour() command and type the polynomial that is dependent on these two vector variables. In last, type the number, which will be the number of curves in created contour line above in Matlab.

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We used clabel() command as shown by green box above. This will create point values on created contour line in Matlan as shown by blue arrows above. We just typed inside the clabel the variable contour() command.

You can edit your contour line manually in Matlab. Also you can add legends, titles and other required elements into your contour line in Matlab. Click on given link and see how to do them.