Last Modified: January 12, 2018

Calculates and returns the contour line of a surface and the contour graph.

X-coordinates of the points of the surface.

The number of elements in **x** must equal the number of columns in **z**. If **x** is empty, this node assigns **x** values of [0, 1, *N*-1], where *N* is the number of columns in **z**.

Y-coordinates of the points of the surface.

The number of elements in **y** must equal the number of rows in **z**. If **y** is empty, this node assigns **y** values of [0, 1, *M*-1], where *M* is the number of rows in **z**.

Heights of the points defined by **x** and **y**.

Number of contour lines that this node calculates.

This input changes to **height** when the data type is a double-precision, floating-point number or a 1D array of double-precision, floating-point numbers.

**Default: **10

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an **error in** input and an **error out** output so that the node can respond to and communicate errors that occur while code is running. The value of **error in** specifies whether an error occurred before the node runs. Most nodes respond to values of **error in** in a standard, predictable way.

**Default: **No error

An XY graph that draws the contour line.

Attributes of the contour line.

This output can return the following data types:

Height of the contour line.

How **number of heights** Affects **height**

This node calculates **height** by dividing the height deviation between the highest and the lowest point of the surface by **number of heights** and incrementing the lowest height by the retrieved quotient.

For example, if **number of heights** is 10, the lowest and highest points in **z** are 100 and 600, respectively, which means, the height deviation between the highest and the lowest point of the surface is 500. The retrieved quotient is 50, and **height** has the following values: 100, 150, 200, 250, 300, 350, 400, 450, and 500.

Coordinates and the closed status of the contour line.

The coordinate of the start point of the contour line at (*x*, *y*) is different from the end point of the contour line at (*x*', *y*').

X-coordinates of the contour line.

Y-coordinates of the contour line.

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

**error in** input and an **error out** output so that the node can respond to and communicate errors that occur while code is running. The value of **error in** specifies whether an error occurred before the node runs. Most nodes respond to values of **error in** in a standard, predictable way.

Contour lines of a surface are line segments that connect points at the same height, as shown in equation *f*(*x*,*y*) = *h*.

The following figure demonstrates an open contour line and a closed contour line.

**Where This Node Can Run: **

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application