Mexican hat wavelet
[PSI,X] = mexihat(LB,UB,N)
[PSI,X] = mexihat(LB,UB,N) returns values
of the Mexican hat wavelet on an
N point regular
X, in the interval
Output arguments are the wavelet function
on the grid
This wavelet has [-5 5] as effective support. Although [-5 5] is the correct theoretical effective support, a wider effective support, [-8 8], is used in the computation to provide more accurate results.
This function is proportional to the second derivative function of the Gaussian probability density function.