Matlab入门（英文）

晓夜寒风

Some MATLAB function descriptions
These lists are copied from the help screens for MATLAB Version 4.2c (dated Nov 23 1994). Only a few of the summaries are listed -- use Matlab's help function to see more.

>> help

晓夜寒风

HELP topics:

, d8 `5 ?( _/ N/ O4 a2 Rmatlab/general       -  General purpose commands.
; ~! j2 ?6 d. g- _' v& H* pmatlab/ops           -  Operators and special characters.
matlab/lang          -  Language constructs and debugging.
- L% F; s7 L% Z0 N/ ^matlab/elmat         -  Elementary matrices and matrix manipulation.
; u$ _, X0 H" r- \' |matlab/specmat       -  Specialized matrices.
6 Y- h9 I: ~: w8 X" I* R& `$ ^matlab/elfun         -  Elementary math functions.
% H- j) d4 {7 N" o+ \matlab/specfun       -  Specialized math functions.
! _5 S+ V& J5 {) b0 K- m) Vmatlab/matfun        -  Matrix functions - numerical linear algebra.
# a# p5 Y! X  P  F+ G) Ymatlab/datafun       -  Data analysis and Fourier transform functions.
  f% Y1 M& L2 M1 d6 H2 f0 jmatlab/polyfun       -  Polynomial and interpolation functions.
matlab/funfun        -  Function functions - nonlinear numerical methods.
, D/ C! @6 y" E3 Rmatlab/sparfun       -  Sparse matrix functions.
matlab/plotxy        -  Two dimensional graphics.
matlab/plotxyz       -  Three dimensional graphics.
matlab/graphics      -  General purpose graphics functions.
! _) A$ F4 w/ wmatlab/color         -  Color control and lighting model functions.
matlab/sounds        -  Sound processing functions.
matlab/strfun        -  Character string functions.
2 [! e/ ^, X6 z- x4 H8 umatlab/iofun         -  Low-level file I/O functions.
; Q  {2 k: S" O% F3 |+ N% Gmatlab/demos         -  The MATLAB Expo and other demonstrations.
toolbox/chem         -  Chemometrics Toolbox
  G8 k# f( s" L2 `; m1 p/ wtoolbox/control      -  Control System Toolbox.
6 M! g% S. U, g) K2 S2 y# ifdident/fdident      -  Frequency Domain System Identification Toolbox
7 J) |+ N- Y1 ^: d1 Y5 z0 w: U; pfdident/fddemos      -  Demonstrations for the FDIDENT Toolbox
( F( n: F- i/ q/ i6 g/ J, X: y3 |toolbox/hispec       -  Hi-Spec Toolbox
toolbox/ident        -  System Identification Toolbox.
: v3 K7 U" l7 ^9 mtoolbox/images       -  Image Processing Toolbox.
5 [" `4 k' E8 ^, B9 k. t+ o& vtoolbox/local        -  Local function library.
2 D! I3 l: @, v6 s! n! v1 m, Ttoolbox/mmle3        -  MMLE3 Identification Toolbox.
. f' e0 `: }1 q* N2 L, g: H4 U' i4 Umpc/mpccmds          -  Model Predictive Control Toolbox
mpc/mpcdemos         -  Model Predictive Control Toolbox
( ?; |" W  m) cmutools/commands     -  Mu-Analysis and Synthesis Toolbox.: Commands directory
' m: B7 b8 y9 T2 E* V/ A% P+ ]mutools/subs         -  Mu-Analysis and Synthesis Toolbox -- Supplement
toolbox/ncd          -  Nonlinear Control Design Toolbox.
$ |1 q8 e  A/ h6 hnnet/nnet            -  Neural Network Toolbox.
nnet/nndemos         -  Neural Network Demonstrations and Applications.
toolbox/optim        -  Optimization Toolbox.
toolbox/robust       -  Robust Control Toolbox.
toolbox/signal       -  Signal Processing Toolbox.
toolbox/splines      -  Spline Toolbox.
7 Y" g; }. u9 }. `: w# x4 Xtoolbox/stats        -  Statistics Toolbox.
3 s7 z" ?0 S) m0 |toolbox/symbolic     -  Symbolic Math Toolbox.
7 E0 ?% ]5 F$ \9 k" B, s8 [toolbox/wavbox       - (No table of contents file)
" j3 ?3 @) X1 f! W2 L' B! R/ f+ P* n4 ?simulink/simulink    -  SIMULINK model analysis and construction functions.
simulink/blocks      -  SIMULINK block library.
3 V6 o+ A' u9 ~$ Psimulink/simdemos    -  SIMULINK demonstrations and samples.
4 |. x0 ]! z9 Otoolbox/codegen      -  Real-Time Workshop
1 A* {  q5 I- b4 Q8 ?+ @
For more help on directory/topic, type "help topic".

晓夜寒风

>> help elmat

Elementary matrices and matrix manipulation.
: I/ |6 r. |% l* E9 x$ w
Elementary matrices.
   zeros       - Zeros matrix.
   ones        - Ones matrix.
5 D0 @/ [" g. H2 Z: D1 |   eye         - Identity matrix.
4 Y4 J/ M9 J0 I- ?  [8 k0 ]/ ?! n   rand        - Uniformly distributed random numbers.
( o- U& y: J& I" Z' P   randn       - Normally distributed random numbers.
   linspace    - Linearly spaced vector.
- o8 K( U0 G& |+ ^! g( X" `2 a8 @   logspace    - Logarithmically spaced vector.
   meshgrid    - X and Y arrays for 3-D plots.
& \- d  x5 z/ Y4 F- ?+ x* p. B   :           - Regularly spaced vector.

Special variables and constants.
   ans         - Most recent answer.
7 u- {! E7 P  }2 g% l. ]" U   eps         - Floating point relative accuracy.
. r3 M7 x# ^7 F  i# L4 p) S   realmax     - Largest floating point number.
! _" T& t$ P5 z- e7 K+ W   realmin     - Smallest positive floating point number.
   pi          - 3.1415926535897....
   i, j        - Imaginary unit.
   inf         - Infinity.
9 ?) b" ~/ V5 P4 Y: y   NaN         - Not-a-Number.
1 L- y, c! R% D. @   flops       - Count of floating point operations.
   nargin      - Number of function input arguments.
6 ?5 I) R$ B  s5 V   nargout     - Number of function output arguments.
   computer    - Computer type.
   isieee      - True for computers with IEEE arithmetic.
( N; d+ H7 G: t; W$ z   isstudent   - True for the Student Edition.
   why         - Succinct answer.
   version     - MATLAB version number.

Time and dates.
8 N6 b- M: q6 U% l- V: ]* f   clock       - Wall clock.
   cputime     - Elapsed CPU time.
6 A1 o2 E! q' f) X* S- P9 f4 `   date        - Calendar.
& |1 o1 h; y; f- n1 w) d   etime       - Elapsed time function.
   tic, toc    - Stopwatch timer functions.

Matrix manipulation.
6 J) A' H3 L" q6 D- i1 x6 ^, y  n   diag        - Create or extract diagonals.
   fliplr      - Flip matrix in the left/right direction.
# x+ _6 ~* L+ X# U( s$ h   flipud      - Flip matrix in the up/down direction.
   reshape     - Change size.
   rot90       - Rotate matrix 90 degrees.
0 j( g: |$ v. K1 A/ d   tril        - Extract lower triangular part.
( H8 d% u: R/ ]   triu        - Extract upper triangular part.
   :           - Index into matrix, rearrange matrix.

晓夜寒风

>> help specmat
$ F7 r* T' R& c. u
Specialized matrices.
1 C/ b  c- ~1 Z) i
. |  a5 ]* L; t. D   compan      - Companion matrix.
   gallery     - Several small test matrices.
   hadamard    - Hadamard matrix.
" t8 D; F' o7 @& `& Q% R   hankel      - Hankel matrix.
4 Z4 m! K& M: J" p: u5 ^- j. q   hilb        - Hilbert matrix.
   invhilb     - Inverse Hilbert matrix.
6 A0 \5 x9 U9 `7 ]% ]7 i! A2 G   kron        - Kronecker tensor product.
   magic       - Magic square.
( D! u# w8 ~: r% y% `7 j8 n2 R   pascal      - Pascal matrix.
) |6 b8 \2 v! q! u   rosser      - Classic symmetric eigenvalue test problem.
   toeplitz    - Toeplitz matrix.
   vander      - Vandermonde matrix.
   wilkinson   - Wilkinson's eigenvalue test matrix.
$ S$ |# u  c1 O' g+ ]1 Q0 }
. z# f6 q* \+ v8 K1 k, T& A
+ |( q, l' G) C>> help elfun
- s# k/ m7 O9 u* I
3 v. L* m4 u0 }- g2 N+ Q Elementary math functions.

+ r) e2 q, C8 f" t( ? Trigonometric.
   sin         - Sine.
% M6 ^8 M1 T9 Y3 D# F. W   sinh        - Hyperbolic sine.
   asin        - Inverse sine.
   asinh       - Inverse hyperbolic sine.
   cos         - Cosine.
; y" o9 ~% s/ ]  b4 Q2 {5 I8 o4 y  k6 w   cosh        - Hyperbolic cosine.
) c4 d; W' s. ~6 f9 C4 }% F; q( `; v   acos        - Inverse cosine.
8 n1 g" x2 R; [5 y7 j   acosh       - Inverse hyperbolic cosine.
3 O2 D* ]: k- `: f/ a  l; L' o   tan         - Tangent.
   tanh        - Hyperbolic tangent.
& P9 v8 C. x4 T; w: E   atan        - Inverse tangent.
  ^, n4 f( ~2 X4 [+ r   atan2       - Four quadrant inverse tangent.
   atanh       - Inverse hyperbolic tangent.
   sec         - Secant.
. K3 c0 _  M# T. H- h% m8 _* v- q   sech        - Hyperbolic secant.
   asec        - Inverse secant.
   asech       - Inverse hyperbolic secant.
   csc         - Cosecant.
   csch        - Hyperbolic cosecant.
   acsc        - Inverse cosecant.
  O# F3 d0 D2 u: |0 B8 B8 p" o   acsch       - Inverse hyperbolic cosecant.
   cot         - Cotangent.
   coth        - Hyperbolic cotangent.
   acot        - Inverse cotangent.
$ s2 O2 e# {8 z+ P1 a! U7 ?   acoth       - Inverse hyperbolic cotangent.
1 |9 g4 I" F7 K; t$ \) g! x
& D0 b- G+ S0 U# ^ Exponential.
   exp         - Exponential.
7 b+ T: x& E. b6 I: u5 E   log         - Natural logarithm.
0 ~  H5 }" d. r: V   log10       - Common logarithm.
   sqrt        - Square root.
8 Q6 q, x4 M! I/ b- `2 H! W, q, p+ h
* Z0 v7 }0 y7 S6 g* M& U0 I5 ?4 H  z# C Complex.
   abs         - Absolute value.
( h( v& Z7 P; K9 d( v   angle       - Phase angle.
   conj        - Complex conjugate.
- Z& ~" F6 |; U! T7 B: I* J$ \/ l   imag        - Complex imaginary part.
# v  _/ M& a# t8 I* @* U   real        - Complex real part.
) R8 j% o6 R" Q& m( F$ n
Numeric.
   fix         - Round towards zero.
" m7 i4 C, f. {   floor       - Round towards minus infinity.
   ceil        - Round towards plus infinity.
) C  Z% }2 k' |9 a+ ?   round       - Round towards nearest integer.
   rem         - Remainder after division.
8 m4 H5 G0 k, M2 J: ^% O: ~   sign        - Signum function.


>> help specfun

晓夜寒风

>> help specmat

- c% G# D3 ?8 ]% P$ V Specialized matrices.
2 P3 r& o* r. w9 R; ]# y+ T! B* ?
; F) R' L# v7 _( M' [( {   compan      - Companion matrix.
' Q# \. ?! d2 d- Z" E4 I   gallery     - Several small test matrices.
9 I' t- N6 |6 Y/ V9 c$ a   hadamard    - Hadamard matrix.
+ `0 Z1 c/ V! o* S' t5 W" c   hankel      - Hankel matrix.
   hilb        - Hilbert matrix.
9 M# \1 n* t3 u2 S   invhilb     - Inverse Hilbert matrix.
% W  l; s+ |- ^% ~5 _$ `   kron        - Kronecker tensor product.
% Z% l$ W( z9 W; D0 Z6 e5 {   magic       - Magic square.
9 ~# h/ w& S; X   pascal      - Pascal matrix.
   rosser      - Classic symmetric eigenvalue test problem.
) g2 \, b. d% ~   toeplitz    - Toeplitz matrix.
8 Q. j, d# b* `) }  T   vander      - Vandermonde matrix.
   wilkinson   - Wilkinson's eigenvalue test matrix.
7 ~$ F9 n; e" l* V1 k

" B) F+ ]% l. r. ?+ N>> help elfun

0 h% W3 P: @. L9 L! K Elementary math functions.

5 v' s1 k, }/ H Trigonometric.
   sin         - Sine.
   sinh        - Hyperbolic sine.
   asin        - Inverse sine.
: U# l% {% Z" S3 b3 o   asinh       - Inverse hyperbolic sine.
& i9 U+ C/ s# ?& o   cos         - Cosine.
7 Q0 }: h/ z$ ]# `* M4 W9 b   cosh        - Hyperbolic cosine.
   acos        - Inverse cosine.
   acosh       - Inverse hyperbolic cosine.
8 p4 |5 R  X2 r% h- r9 E& q   tan         - Tangent.
. H0 r, n  T8 b   tanh        - Hyperbolic tangent.
1 u5 f! o: ?8 s2 k% b7 S   atan        - Inverse tangent.
   atan2       - Four quadrant inverse tangent.
   atanh       - Inverse hyperbolic tangent.
   sec         - Secant.
   sech        - Hyperbolic secant.
   asec        - Inverse secant.
   asech       - Inverse hyperbolic secant.
6 r, \0 n! K' |) h   csc         - Cosecant.
   csch        - Hyperbolic cosecant.
   acsc        - Inverse cosecant.
   acsch       - Inverse hyperbolic cosecant.
" M9 h( K: l3 ?; H9 u, Q- n   cot         - Cotangent.
   coth        - Hyperbolic cotangent.
   acot        - Inverse cotangent.
   acoth       - Inverse hyperbolic cotangent.

' j! B( y: f% c! P" t Exponential.
   exp         - Exponential.
0 J8 \: g$ x! Z9 K   log         - Natural logarithm.
% @4 C  n3 k# @& ^8 S# T   log10       - Common logarithm.
   sqrt        - Square root.

Complex.
   abs         - Absolute value.
2 z, r7 X4 W+ D: |- w) c   angle       - Phase angle.
% t8 `, q' _& k8 Q  Z. x/ H! g0 V2 m. F   conj        - Complex conjugate.
   imag        - Complex imaginary part.
   real        - Complex real part.

Numeric.
   fix         - Round towards zero.
. C8 Z7 Y8 Y2 o% X  S   floor       - Round towards minus infinity.
   ceil        - Round towards plus infinity.
+ i/ ^. ?; y, z& t$ [3 G2 M6 v2 q   round       - Round towards nearest integer.
   rem         - Remainder after division.
. E) |# }9 u& }( B+ G6 u8 F; F  f+ T   sign        - Signum function.
) H0 S( N! e# }& E* ~& g' e+ ]9 H$ m* U

>> help specfun

晓夜寒风

Specialized math functions.

. [" z3 w7 O& ^4 k   besselj     - Bessel function of the first kind.
   bessely     - Bessel function of the second kind.
   besseli     - Modified Bessel function of the first kind.
   besselk     - Modified Bessel function of the second kind.
0 ?/ F& w# l9 O# o9 t6 `: v   beta        - Beta function.
; G4 v( o3 p" L) o. {, D7 G   betainc     - Incomplete beta function.
. k( Z+ m% s& x% W   betaln      - Logarithm of beta function.
   elli石皮解      - Jacobi elliptic functions.
( J6 J7 c/ B; \# \' @- f   ellipke     - Complete elliptic integral.
5 ~, R, |  w0 u$ i   erf         - Error function.
: ?2 V; X; n: c0 a. O   erfc        - Complementary error function.
5 I! K/ l6 J' G/ E$ o/ ~   erfcx       - Scaled complementary error function.
3 v: Z+ c- \" y* A5 E7 C   erfinv      - Inverse error function.
* K& ?. g$ z! O9 z( |: @   expint      - Exponential integral function.
' x$ H  v  c4 a2 T/ n) A7 x; h   gamma       - Gamma function.
   gcd         - Greatest common divisor.
# L' t& f8 C# J+ [8 y( f   gammainc    - Incomplete gamma function.
   lcm         - Least common multiple.
   legendre    - Associated Legendre function.
" d* T# u2 t- z. C   gammaln     - Logarithm of gamma function.
   log2        - Dissect floating point numbers.
   pow2        - Scale floating point numbers.
  l1 A! S9 G1 D' P4 N$ ?* U   rat         - Rational approximation.
0 _0 ?3 W0 u& |: k& }4 A0 q2 Y   rats        - Rational output.
7 W2 S  h' a/ a7 Y1 E5 m' X   cart2sph    - Transform from Cartesian to spherical coordinates.
! R6 u- E& Z" ?( }- u  _/ V4 ]   cart2pol    - Transform from Cartesian to polar coordinates.
   pol2cart    - Transform from polar to Cartesian coordinates.
9 c- R/ u+ L& s# A   sph2cart    - Transform from spherical to Cartesian coordinates.

$ r& p: u1 W9 a: I5 s$ v
>> help matfun
% j0 \' U# F) T
Matrix functions - numerical linear algebra.

0 s* W- E4 b) p; Z4 h) M0 o Matrix analysis.
3 J. \) {/ K- C) D8 s: v   cond        - Matrix condition number.
: F* L' Y  o4 Y8 s   norm        - Matrix or vector norm.
   rcond       - LINPACK reciprocal condition estimator.
   rank        - Number of linearly independent rows or columns.
   det         - Determinant.
/ L1 I8 @1 i9 {" I; y   trace       - Sum of diagonal elements.
) l7 e" f8 C7 e   null        - Null space.
   orth        - Orthogonalization.
   rref        - Reduced row echelon form.
$ c- p6 P" h8 c- a( x
Linear equations.
; O! f8 p3 g" \  j   \ and /     - Linear equation solution; use "help slash".
5 n7 ^8 A5 k$ J$ K/ k7 a& t3 Y   chol        - Cholesky factorization.
   lu          - Factors from Gaussian elimination.
4 v! l- B' T# |+ r   inv         - Matrix inverse.
1 p- ^; v& p* T+ N$ c# I   qr          - Orthogonal-triangular decomposition.
. ], X' a# J1 @$ Y# ~( m   qrdelete    - Delete a column from the QR factorization.
& \" x, E3 U( z8 E$ ~# c' V/ I   qrinsert    - Insert a column in the QR factorization.
   nnls        - Non-negative least-squares.
   pinv        - Pseudoinverse.
   lscov       - Least squares in the presence of known covariance.

1 Y4 q1 M# `# v# j0 v5 ]! h Eigenvalues and singular values.
' u1 Y9 G& q, `2 X   eig         - Eigenvalues and eigenvectors.
1 _! A3 G$ w2 s! I4 V   poly        - Characteristic polynomial.
& n. Y: }1 f9 r: \' N& _' g; J2 g   polyeig     - Polynomial eigenvalue problem.
9 A' `$ F# u3 g( f- h3 x; f. d6 {, u1 \   hess        - Hessenberg form.
' R( l- j9 L2 V) M' c   qz          - Generalized eigenvalues.
, e7 @9 V+ F" J% \  R7 J   rsf2csf     - Real block diagonal form to complex diagonal form.
! |1 b& L" R+ X" L# Z$ L   cdf2rdf     - Complex diagonal form to real block diagonal form.
   schur       - Schur decomposition.
   balance     - Diagonal scaling to improve eigenvalue accuracy.
( \+ N: O- F4 t. h/ V$ L$ i: N   svd         - Singular value decomposition.
+ F8 W" n% C* o
% g  z' U5 L+ S) c Matrix functions.
5 ?) y+ h5 z' u& F* `! M/ N; d   expm        - Matrix exponential.
( y7 m) G* O6 g6 Y   expm1       - M-file implementation of expm.
6 b1 Q$ w( P3 p3 {2 Z   expm2       - Matrix exponential via Taylor series.
. n+ d6 ]' C& y) o$ Y' p   expm3       - Matrix exponential via eigenvalues and eigenvectors.
, }2 U1 y, R0 p3 j% U6 L( f   logm        - Matrix logarithm.
) C$ Y" ]4 D- Z8 L   sqrtm       - Matrix square root.
$ c3 n5 I0 Z& d' F   funm        - Evaluate general matrix function.

晓夜寒风

>> help general
) v0 k' C5 @8 s
4 ]5 ^4 a+ J! J+ F+ u General purpose commands.
) u: D! ~* I* w% c7 D# c) n7 M MATLAB Toolbox  Version 4.2a 25-Jul-94
) i$ \) z, h. p- Q: i
2 [  s+ a9 h# L! X& ~3 ~ Managing commands and functions.
4 w" o9 h8 S4 b9 ~+ U: O  S. e   help        - On-line documentation.
4 n, U2 g, Y6 R   doc         - Load hypertext documentation.
  M1 K& I% U, X* x& D% A   what        - Directory listing of M-, MAT- and MEX-files.
1 a" X8 C; Y7 x9 r7 Z/ A4 p. W   type        - List M-file.
   lookfor     - Keyword search through the HELP entries.
+ W2 q+ @4 Y1 @) d: C2 K   which       - Locate functions and files.
   demo        - Run demos.
& h" X2 @, i$ q7 ?& v1 {/ z6 @& ~   path        - Control MATLAB's search path.
% j' I4 `# @$ H. d
3 T4 Z) h6 B4 S/ h Managing variables and the workspace.
) l; W! f, s, J8 A1 }2 R1 R   who         - List current variables.
   whos        - List current variables, long form.
  E* c/ z- v1 A3 H. m   load        - Retrieve variables from disk.
   save        - Save workspace variables to disk.
   clear       - Clear variables and functions from memory.
   pack        - Consolidate workspace memory.
* q- i6 f5 {2 ?# e6 K   size        - Size of matrix.
$ n3 }! N) o  J7 ?% V# O   length      - Length of vector.
: I9 F6 {) S# I6 }5 m/ V   disp        - Display matrix or text.

' ?, b( @8 F: ^+ J7 i* R& ]( r; T Working with files and the operating system.
   cd          - Change current working directory.
' D0 l& X3 ^% N5 a) [5 H) t* M1 j   dir         - Directory listing.
6 b5 z0 q  d- P! H7 Z   delete      - Delete file.
8 P# {6 f# k2 m. E; w8 `2 W   getenv      - Get environment value.
   !           - Execute operating system command.
) t, K- A" X4 r; d   unix        - Execute operating system command & return result.
   diary       - Save text of MATLAB session.
$ o" p5 Q7 U1 ^, p- G
& J; F9 x  b6 Y- W+ k/ n" I Controlling the command window.
   cedit       - Set command line edit/recall facility parameters.
   clc         - Clear command window.
   home        - Send cursor home.
   format      - Set output format.
& w+ n0 K) k/ _& h   echo        - Echo commands inside script files.
( Y4 g9 c7 l, u5 o   more        - Control paged output in command window.

, P: L7 X. s5 L3 S5 \" N5 [ Starting and quitting from MATLAB.
   quit        - Terminate MATLAB.
   startup     - M-file executed when MATLAB is invoked.
; G' u1 d8 o. l- l. L   matlabrc    - Master startup M-file.

" s* {; X; \2 e3 k  M General information.
   info        - Information about MATLAB and The MathWorks, Inc.
   subscribe   - Become subscribing user of MATLAB.
   hostid      - MATLAB server host identification number.
   whatsnew    - Information about new features not yet documented.
   ver         - MATLAB, SIMULINK, and TOOLBOX version information.

晓夜寒风

>> help general
1 f8 |# s/ I; L1 a2 e$ t% O! V+ h  |
General purpose commands.
- y+ y0 ?( r( N( a MATLAB Toolbox  Version 4.2a 25-Jul-94

5 a, [% |- ?+ M1 E' d4 l% E Managing commands and functions.
   help        - On-line documentation.
6 S4 j0 {# y% c/ g   doc         - Load hypertext documentation.
: d& K5 Q! P8 @, @! e% X   what        - Directory listing of M-, MAT- and MEX-files.
   type        - List M-file.
& R' b+ W/ _+ j$ P. J7 n   lookfor     - Keyword search through the HELP entries.
' B2 [/ e7 W. V/ V2 E. u; p   which       - Locate functions and files.
   demo        - Run demos.
   path        - Control MATLAB's search path.
) A0 k1 i! B' k5 `& B5 i0 X* @3 H- n
Managing variables and the workspace.
   who         - List current variables.
6 N. O7 P8 N6 t% q6 r; |1 r/ X   whos        - List current variables, long form.
   load        - Retrieve variables from disk.
   save        - Save workspace variables to disk.
. l4 q! ?( s. \' O. w" v& ^: R   clear       - Clear variables and functions from memory.
# B. H* B. X+ b4 X+ F4 ^   pack        - Consolidate workspace memory.
   size        - Size of matrix.
1 l" s2 m- k0 B3 `0 J' P   length      - Length of vector.
   disp        - Display matrix or text.
  y9 Y* P8 ~9 r6 J5 M6 K: u5 T, D7 {0 a) O
5 _' _+ \0 r9 r) f9 ~ Working with files and the operating system.
   cd          - Change current working directory.
   dir         - Directory listing.
$ J; _4 B! X' Q( Q9 H6 U   delete      - Delete file.
# a8 ^5 Q2 f: f6 ?6 T   getenv      - Get environment value.
   !           - Execute operating system command.
6 P) r; [, c) R. N# U& w   unix        - Execute operating system command & return result.
   diary       - Save text of MATLAB session.
' c' W3 O3 m. U& w  o: _' B$ B4 v
2 y2 v: U; u/ S9 I& a Controlling the command window.
/ z8 K; D* ^4 _   cedit       - Set command line edit/recall facility parameters.
# T2 J  P' v- s8 Y   clc         - Clear command window.
   home        - Send cursor home.
   format      - Set output format.
' [! b5 q. ]$ K9 ~& U6 D  Y   echo        - Echo commands inside script files.
   more        - Control paged output in command window.

Starting and quitting from MATLAB.
   quit        - Terminate MATLAB.
   startup     - M-file executed when MATLAB is invoked.
   matlabrc    - Master startup M-file.

General information.
6 j, \. |2 ~$ C* r   info        - Information about MATLAB and The MathWorks, Inc.
: x8 S) X0 O/ {7 t  M3 V- k0 x' h   subscribe   - Become subscribing user of MATLAB.
+ u& j% f4 }, O' h   hostid      - MATLAB server host identification number.
   whatsnew    - Information about new features not yet documented.
* ]2 C9 ^) B% s' j: T6 _+ z   ver         - MATLAB, SIMULINK, and TOOLBOX version information.

晓夜寒风

>> help funfun

( c: X4 [! X7 r: i8 D6 I Function functions - nonlinear numerical methods.

6 o9 c3 b9 d5 s5 J2 h' I   ode23       - Solve differential equations, low order method.
2 E$ z' q/ s7 q& H- Q7 a; @1 g   ode23p      - Solve and plot solutions.
. Z9 r! ~- Y+ C6 U8 m   ode45       - Solve differential equations, high order method.
: Q1 B2 d$ f: v, |$ S   quad        - Numerically evaluate integral, low order method.
! v: Q# L, L3 t8 L# y6 n   quad8       - Numerically evaluate integral, high order method.
   fmin        - Minimize function of one variable.
) L- }( n( `, |+ a& }8 \   fmins       - Minimize function of several variables.
6 q: w, Y0 y% |  j7 ?   fzero       - Find zero of function of one variable.
   fplot       - Plot function.

) d& H/ g" [8 F; I2 f! X* V% g See also The Optimization Toolbox, which has a comprehensive
set of function functions for optimizing and minimizing functions.

晓夜寒风

>> help funfun
! p; ]' c4 ]  V$ f' v4 }# M# L# i
) q# O5 z% X% L( D+ n( P& s Function functions - nonlinear numerical methods.

   ode23       - Solve differential equations, low order method.
   ode23p      - Solve and plot solutions.
   ode45       - Solve differential equations, high order method.
   quad        - Numerically evaluate integral, low order method.
   quad8       - Numerically evaluate integral, high order method.
6 u( `$ A2 x+ l   fmin        - Minimize function of one variable.
   fmins       - Minimize function of several variables.
   fzero       - Find zero of function of one variable.
% n3 E+ i; K; C5 ]   fplot       - Plot function.
  |; B8 ]2 m2 T
& b" P1 x  w* y6 Z0 r See also The Optimization Toolbox, which has a comprehensive
set of function functions for optimizing and minimizing functions.