Matrix Elements VB-800 Instrukcja Użytkownika Strona 60

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52 Appendix A2 Exported Function Summary
FCubicSpline
bool FCubicSpline(VECTOR vY, VECTOR vT, int cT, double *pdAlpha,
VECTOR vG, VECTOR vX, double *pdCV, double *pdPar, bool fAuto,
int iDesiredPar);
vY[cT] in: variable of which to compute spline
vT[cT] in: x-variable or NULL (then against time)
cT in: number of observations, T
dAlpha in: bandwidth parameter (if ¡= 1e-20: 1600 is used)
vG[cT] out: natural cubic spline, according to vX (sorted vT)
pdCV in: NULL or pointer
out: cross-validation value
vX[cT] in: NULL or vector
out: xaxis (sorted vT) for drawing, only if vT != NULL
pdPar in: NULL or pointer
out: equivalent number of parameters
iDesiredParin: desired equivalent no of parameters or 0
fHP in: FALSE: use spline, TRUE: Hodrick-Prescott
Return value
Returns TRUE if successful, FALSE if out of memory.
FftComplex, FftReal, FftDiscrete
void FftComplex(VECTOR vXr, VECTOR vXi, int iPower, int iDir);
void FftReal(VECTOR vXr, VECTOR vXi, int iPower, int iDir);
bool FftDiscrete(VECTOR vXr, VECTOR vXi, int cN, int iDir);
vXr[n] in: vector with real part, n =2
iPower
(discrete FFT:
n = cN)
out: FFT (or inverse FFT) real part
vXi[n] in: vector with imaginary part, n =2
iPower
(discrete
FFT: n = cN)
out: FFT (or inverse FFT) imaginary part
iPower in: the vector sizes is 2
iPower
cN in: indicates whether an FFT (iPower 1)oran
inverse FFT must be performed (iPower 0)
Return value
FftDiscrete returns FALSE if there is not enough memory, TRUE otherwise.
Also see under fft and dfft.
FIsInf, FIsNaN
bool FIsNaN(double d);
bool FIsInf(double d);
d in: value to check
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