User`s guide

Spectral Analysis Example

6 W rite source code for an application that accesses the component.

The sample application for this example is in

SpectraExample\SpectraDemoJavaApp\powerspect.java.

The program listing is shown here.

powerspect.java

/* powerspect.java

* This file is used as an example for the MATLAB

* Builder for Java product.

/* Necessary package imports */

import com.mathworks.toolbox.javabuilder.*;

import spectralanalysis.*;

* powerspect class computes and plots the power

* spectral density of an input signal.

class powerspect

{

public static void main(String[] args)

{

double interval = 0.01; /* Sampling interval */

int nSamples = 1001; /* Number of samples */

MWNumericArray data = null; /* Stores input data */

Object[] result = null; /* Stores result */

fourier theFourier = null; /* Fourier class instance */

try

{

* Construct input data as sin(2*PI*15*t) +

* sin(2*PI*40*t) plus a random signal.

* Duration = 10

5-11