m4_mathematical.hlp

是一个经济学管理应用软件 很难找的 但是经济学学生又必须用到

{smcl}
{* 14jan2005}{...}
{cmd:help m4 mathematical}
{hline}
{* index mathematical functions}{...}

{title:Title}

{p 4 4 2}
{bf:[M-4] mathematical -- Important mathematical functions}


{title:Contents}

{col 5}   {bf:[M-5]}
{col 5}{bf:Manual entry{col 22}Function{col 40}Purpose}
{col 5}{hline}

{col 5}   {c TLC}{hline 19}{c TRC}
{col 5}{hline 3}{c RT}{it: Fourier transform }{c LT}{hline}
{col 5}   {c BLC}{hline 19}{c BRC}

{col 5}{bf:{help mf_fft:fft()}}{...}
{col 22}{cmd:fft()}{...}
{col 39}fast Fourier transform
{col 22}{cmd:invfft()}{...}
{col 39}inverse fast Fourier transform
{col 22}{cmd:convolve()}{...}
{col 39}convolution
{col 22}{cmd:Corr()}{...}
{col 39}correlation
{col 22}{cmd:ftperiodogram()}{...}
{col 39}power spectrum
{col 22}{cmd:ftpad()}{...}
{col 39}pad to power-of-2 length
{col 22}{cmd:ftwrap()}{...}
{col 39}convert to frequency-wraparound order
{col 22}{cmd:ftunwrap()}{...}
{col 39}convert from frequency-wraparound order
{col 22}{cmd:ftretime()}{...}
{col 39}change time scale of signal
{col 22}{cmd:ftfreqs()}{...}
{col 39}frequencies of transform

{col 5}   {c TLC}{hline 15}{c TRC}
{col 5}{hline 3}{c RT}{it: Cubic splines }{c LT}{hline}
{col 5}   {c BLC}{hline 15}{c BRC}

{col 5}{bf:{help mf_spline3:spline3()}}{...}
{col 22}{cmd:spline3()}{...}
{col 39}fit cubic spline
{col 22}{cmd:spline3eval()}{...}
{col 39}evaluate cubic spline

{col 5}   {c TLC}{hline 13}{c TRC}
{col 5}{hline 3}{c RT}{it: Polynomials }{c LT}{hline}
{col 5}   {c BLC}{hline 13}{c BRC}

{col 5}{bf:{help mf_polyeval:polyeval()}}{...}
{col 22}{cmd:polyeval()}{...}
{col 39}evaluate polynomial
{col 22}{cmd:polysolve()}{...}
{col 39}solve for polynomial
{col 22}{cmd:polytrim()}{...}
{col 39}trim polynomial
{col 22}{cmd:polyderiv()}{...}
{col 39}derivative of polynomial
{col 22}{cmd:polyinteg()}{...}
{col 39}integral of polynomial
{col 22}{cmd:polyadd()}{...}
{col 39}add polynomials
{col 22}{cmd:polymult()}{...}
{col 39}multiply polynomials
{col 22}{cmd:polydiv()}{...}
{col 39}divide polynomials
{col 22}{cmd:polyroots()}{...}
{col 39}find roots of polynomial
{col 5}{hline}


{title:Description}

{p 4 4 2}
The above functions are important mathematical functions that most people 
would not call either matrix functions or scalar functions, but which 
use matrices and scalars.


{title:Remarks}

{p 4 4 2}
For other mathematical functions, see 

{col 8}{...}
{bf:{help m4_matrix:[M-4] matrix}}{...}
{col 30}Matrix mathematical functions

{col 8}{...}
{bf:{help m4_scalar:[M-4] scalar}}{...}
{col 30}Scalar mathematical functions

{col 8}{...}
{bf:{help m4_statistical:[M-4] statistical}}{...}
{col 30}Statistical functions



{title:Also see}

{p 4 13 2}
Manual:  {hi:[M-4] mathematical}

{p 4 13 2}
Online:  help for 
{bf:{help m4_intro:[M-4] intro}},
{bf:{help mata:[M-0] intro}}
{p_end}