变换nag fft init trigc06gzc1大物实验报告cl05.pdf
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c06–FourierTransformsc06gzc
nagfftinittrig(c06gzc)
1.Purpose
nagfftinittrig(c06gzc)calculatesthetrigonometriccoefficientsrequiredforthe
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c06–FourierTransformsc06ecc
nagfftcomplex(c06ecc)
1.Purpose
nagfftcomplex(c06ecc)calculatesthediscreteFouriertransformofasequenceofncomplexdata
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插值e01bfc大物实验报告cl05.pdf
e01–Interpolatione01bfc
nagmonotonicevaluate(e01bfc)
1.Purpose
nagmonotonicevaluate(e01bfc)evaluatesapiecewisecubicHermiteinterpolantatasetofpo
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特殊功能近似大物实验报告s18afc cl05.pdf
s–ApproximationsofSpecialFunctionss18afc
nagbesseli1(s18afc)
1.Purpose
nagbesseli1(s18afc)returnsavalueforthemodifiedBesselfunctionI1(x).
2.Specification
#includenag.h
#includenags.h
doublenag_bessel_i1(doublex,NagError*fail)
3.Description
ThisfunctionevaluatesanapproximationtothemodifiedBesselfunction
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nagsinintegral(s13adc)
1.Purpose
nagsinintegral(s13adc)returnsthevalueofthesineintegralSi(x).
2.Specification
#includenag.h
#includenags.h
doublenag_sin_integral(doublex)
3.Description
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Si(x)=xsinudu.
0u
TheapproximationisbasedonseveralCheb
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nagrealcholeskyskyline(f01mcc)
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1.Purpose
nagairybi(s17ahc)returnsavalueoftheAiryfunctionBi(x).
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#i
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nagmvhierarclusteranalysis(g03ecc)
1.Purpose
nagmvhierarclusteranalysis(g03eerformshierarchicalclusteranalysis.
2.Specification
#includenag.h
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nagmvprincoordanalysis(g03fac)
1.Purpose
nagmvprincoordanalysis(g03fac)performsaprincipalcoordinateanalysisalsoknownasclassical
metricscaling.
2.Specification
#includenag.h
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g02–RegressionAnalysisg02brc
nagkenspecorrcoeff(g02brc)
1.Purpose
nagkenspecorrcoeff(g02brc)calculatesKendallandSpearmanrankcorrelationcoefficients.
2.Specification
#includenag.h
#includenagg02.h
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Integersvar[],Integersobs[],doublecorr[],Inte
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f–LinearAlgebraf04adc
nagcomplexlineqnmultrhs(f04adc)
1.Purpose
nagcomplexlineqnmultrhs(f04adc)calculatesthesolutionofasetofcomplexlinearequations
withmultipleright-handsides.
2.Specification
#includenag.h
#includenagf04.h
voig_complex_lin_eqn_mult_rhs(Integern,Integernrhs,Complexa[],
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s–ApproximationsofSpecialFunctionss21bbc
nagellipticintegralrf(s21bbc)
1.Purpose
nagellipticintegralrf(s21bbc)returnsavalueofthesymmetrisedellipticintegralofthefirstkind.
2.Specification
#includenag.h
#includenags.h
doublenag_elliptic_integral_rf(doublex,doubley,doublez,NagError*fail)
3.Description
Th
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nagprodlimitsurvivfn(g12aac)
1.Purpose
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特殊功能近似大物实验报告s17agc cl05.pdf
s–ApproximationsofSpecialFunctionss17agc
nagairyai(s17agc)
1.Purpose
nagairyai(s17agc)returnsavaluefortheAiryfunctionAi(x).
2.Specification
#includenag.h
#includenags.h
doublenag_airy_ai(doublex,NagError*fail)
3.Description
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g02–RegressionAnalysisg02dnc
nagregsnmultlinearestfunc(g02dnc)
1.Purpose
nagregsnmultlinearestfunc(g02dnc)givestheestimateofanestimablefunctionalongwithits
standarderror.
2.Specification
#includenag.h
#includenagg02.h
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快速傅立叶变换FFT实验报告.doc
快速傅立叶变换（FFT）算法实验
实验目的
加深对DFT算法原理和基本性质的理解；
熟悉FFT算法原理和FFT子程序的应用；
学习用FFT对连续信号和时域信号进行谱分析的方法，了解可能出现的分析误差及其原因，以便在实际中正确应用FFT。
实验设备
计算机，CCS 3.1 版软件，E300实验箱，DSP仿真器，导线
基本原理
离散傅立叶变换DFT的定义：将时域的采样变换成频域的周期性离散函数，频域的采样也可以变换成时域的周期性离散函数，这样的变换称为离散傅立叶变换，简称DFT。
FFT是DFT的一种快速算法，将DFT的N2步运算减少为（N/2）log2N步，极大的提高了运算的速度