integ2d

Purpose

Approximate 2-D integral.

Synopsis

som = integ2d(MAT)
som = integ2d(MAT,x)
som = integ2d(MAT,x,y)

Description

integ2d approximates the 2-D integral of matrix MAT according to abscissa x and ordinate y.

Name	Description	Default value
MAT	(M,N) matrix to be integrated
x	N-row-vector indicating the abscissa integration path	(1:N)
y	M-column-vector indicating the ordinate integration path	(1:M)
som	result of integration

Example

Consider the scalogram of a sinusoidal frequency modulation of 128 points, and compute the integral over the time-scale plane of the scalogram :

         S = fmsin(128,0.2,0.3);
         [TFR,t,f] = tfrscalo(S,1:128,8,0.1,0.4,128,1);
         Etfr = integ2d(TFR,t,f)
         Etfr = 
                128.0000

We find for Etfr the value of the signal energy, which is the expected value since the scalogram preserves energy.

See Also

integ.

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