MATLAB BUILDER JA 2 Uživatelská příručka stáhnout pdf (Strana 243)

Spectral Analysis Example

The program does the following:

• Constructs an input array with values representing a random signal

with two sinusoids at 15 and 40 Hz embedded inside of it

• Creates an

MWNumericArray array that contains the data, as shown:

data = MWNumericArray.newInstance(dims, MWClassID.DOUBLE, MWComplexity.REAL);

• Instantiates a fourier object

• Calls the

plotfft method, w hich calls computeftt and plots the data

• Uses a

try/catch block to handle exceptions

• Frees native resources using

MWArray methods

7 Compile the powerspect.java application using javac.

a. Open a Command P rompt window and

cd to the

matlabroot\work\spectralanalysis directory.

b. On Windows, execute the fo llo wing command:

javac -classpath

matlabroot\java\jar\toolbox\javabuilder.jar;

.\distrib\spectralanalysis.jar powerspect.java

c. On UNIX, execute the following command:

javac -classpath

matlabroot/java/jar/toolbox/javabuilder.jar:

./distrib/spectralanalysis.jar powerspect.java

Note For matl abroot substitute the MATLAB root directory on your

system. Type

matlabroot to see this directory name.

8 Run the application

• On Windows, execute the

powerspect class file as follows:

java -classpath

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MATLAB BUILDER JA 2 Uživatelská příručka Strana 243