# dlaplacian (MathScript RT Module Function)

LabVIEW 2012 MathScript RT Module Help

Edition Date: June 2012

Part Number: 373123C-01

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Owning Class: vector

Requires: MathScript RT Module

## Syntax

c = dlaplacian(a)

c = dlaplacian(a, d)

c = dlaplacian(a, dx, dy)

Legacy Name: `del2`

## Description

Computes the discrete version of the Laplacian. The algorithm in this function works by extrapolating boundary conditions.

Details

Examples

## Inputs

Name Description
a Specifies the values of the function for which you want to compute the Laplacian. a is a matrix.
d Specifies the spacing between points along the x- and y-axes, or between values of the first and second dimensions in a 2D array. d is an array of real, double-precision, floating-point numbers. The default is 1, or dx = dy = 1.
dx Specifies the spacing between points along the x-axis, or between values of the second dimension in a 2D array. dx is an array of real, double-precision, floating-point numbers. The default is 1.
dy Specifies the spacing between points along the y-axis, or between values of the first dimension in a 2D array. dy is an array of real, double-precision, floating-point numbers. The default is 1.

## Outputs

Name Description
c Returns a matrix that represents the Laplacian scaled by 0.25.

## Details

You can specify the spacing between the points of the dlaplacian function in two ways. If dx or dy contains only one element, the spacing between two consecutive points on the corresponding axis is constant. If dx or dy contains more than one element, the values of the elements specify the coordinates of the points on the corresponding axis. The length of dx or dy must therefore conform to the corresponding dimension of a.

The following table lists the support characteristics of this function.

 Supported in the LabVIEW Run-Time Engine Yes Supported on RT targets Yes Suitable for bounded execution times on RT Not characterized

## Examples

A = peakfcn2d(30);
C = dlaplacian(A);
surface(C)