Definition at line 59 of file MakeGaussIIR1d.h. Referenced by MakeGaussIIR1d(). 00060 { 00061 double var, re, im; 00062 double modulus, phase; 00063 int mm; 00064 00065 /* 00066 * Compute the variance 00067 */ 00068 var = 0.0; 00069 for (mm = 1; mm <= (nn - (nn % 2)); mm += 2) 00070 { 00071 modulus = sqrt(pp[mm].re * pp[mm].re + pp[mm].im * pp[mm].im); 00072 phase = atan(pp[mm].im / pp[mm].re); 00073 modulus = exp( log( modulus ) / q ); 00074 phase = phase / q; 00075 re = modulus * cos(phase); 00076 im = modulus * sin(phase); 00077 00078 var += ((4 * (re + (re - 2) * (re*re + im*im))) / 00079 pow(1 - 2*re + re*re + im*im, 2.0)); 00080 } 00081 if ( (nn % 2) == 1 ) 00082 { 00083 modulus = sqrt(pp[mm].re * pp[mm].re + pp[mm].im * pp[mm].im); 00084 phase = atan(pp[mm].im / pp[mm].re); 00085 modulus = exp( log( modulus ) / q ); 00086 phase = phase / q; 00087 re = modulus * cos(phase); 00088 im = modulus * sin(phase); 00089 var += (2 * re) / pow(re - 1, 2.0); 00090 } 00091 00092 return( (double) sqrt( var ) ); 00093 }
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1.5.1