Matlab入门（英文）

晓夜寒风

Some MATLAB function descriptions
! H8 T3 ^- W& F. n* \5 x9 fThese 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.

( |. S9 C, Q8 }% T) ^3 E+ t/ J>> help

晓夜寒风

HELP topics:
+ O# }* U) @+ b& i. G; x
matlab/general       -  General purpose commands.
( n6 q) b0 m2 ~1 ~matlab/ops           -  Operators and special characters.
matlab/lang          -  Language constructs and debugging.
matlab/elmat         -  Elementary matrices and matrix manipulation.
matlab/specmat       -  Specialized matrices.
matlab/elfun         -  Elementary math functions.
matlab/specfun       -  Specialized math functions.
: n: l$ z% C. k1 m% Mmatlab/matfun        -  Matrix functions - numerical linear algebra.
matlab/datafun       -  Data analysis and Fourier transform functions.
5 w! E+ _9 r* i9 \2 e2 E+ Bmatlab/polyfun       -  Polynomial and interpolation functions.
0 ~$ k5 ~3 m7 fmatlab/funfun        -  Function functions - nonlinear numerical methods.
# }! ~: J6 I0 Y0 Y$ tmatlab/sparfun       -  Sparse matrix functions.
matlab/plotxy        -  Two dimensional graphics.
8 K& V5 J3 i. ^) {4 l0 z. x1 rmatlab/plotxyz       -  Three dimensional graphics.
8 F) w9 p" y0 U$ Umatlab/graphics      -  General purpose graphics functions.
6 V; K# M3 ?, E; W, j/ y8 r: s8 l! omatlab/color         -  Color control and lighting model functions.
matlab/sounds        -  Sound processing functions.
matlab/strfun        -  Character string functions.
2 c# V: x( L, Umatlab/iofun         -  Low-level file I/O functions.
matlab/demos         -  The MATLAB Expo and other demonstrations.
toolbox/chem         -  Chemometrics Toolbox
/ b+ \6 I, f& B8 t, c% Jtoolbox/control      -  Control System Toolbox.
' O# O$ B3 j  k& n6 Rfdident/fdident      -  Frequency Domain System Identification Toolbox
0 O: H% E3 E: v( qfdident/fddemos      -  Demonstrations for the FDIDENT Toolbox
toolbox/hispec       -  Hi-Spec Toolbox
toolbox/ident        -  System Identification Toolbox.
4 ~* S0 U2 U2 Btoolbox/images       -  Image Processing Toolbox.
" u" K1 c! I$ D2 D% G% ?: z- K1 itoolbox/local        -  Local function library.
/ o9 d' _9 e  Ftoolbox/mmle3        -  MMLE3 Identification Toolbox.
4 r/ K0 M& g' S! O0 L8 M; o/ G6 H) Vmpc/mpccmds          -  Model Predictive Control Toolbox
. X* y6 U; B3 o2 m7 S% O8 D. @5 `/ dmpc/mpcdemos         -  Model Predictive Control Toolbox
' e! Z- c; Y* h; u* ]) g1 \1 Fmutools/commands     -  Mu-Analysis and Synthesis Toolbox.: Commands directory
. w4 d) U3 \! A8 T8 U/ jmutools/subs         -  Mu-Analysis and Synthesis Toolbox -- Supplement
toolbox/ncd          -  Nonlinear Control Design Toolbox.
5 S/ g- S  q2 p+ @nnet/nnet            -  Neural Network Toolbox.
nnet/nndemos         -  Neural Network Demonstrations and Applications.
toolbox/optim        -  Optimization Toolbox.
  w4 M$ k% X3 }- j) Ptoolbox/robust       -  Robust Control Toolbox.
% u3 a% E/ v1 k/ v7 ?toolbox/signal       -  Signal Processing Toolbox.
) T& K! L1 w  r" D0 K2 Xtoolbox/splines      -  Spline Toolbox.
1 K& J' W$ A/ N$ V+ xtoolbox/stats        -  Statistics Toolbox.
# i: Y  O+ [& T2 D7 }toolbox/symbolic     -  Symbolic Math Toolbox.
toolbox/wavbox       - (No table of contents file)
- Z. r: B' r2 Vsimulink/simulink    -  SIMULINK model analysis and construction functions.
simulink/blocks      -  SIMULINK block library.
8 B$ t8 q2 j" z# l: Isimulink/simdemos    -  SIMULINK demonstrations and samples.
& V, K  g: W- I1 g3 stoolbox/codegen      -  Real-Time Workshop
0 y4 V+ M) B1 t: _! g% j# w
, [0 z: h- ~9 L: @+ W# w9 bFor more help on directory/topic, type "help topic".

晓夜寒风

>> help elmat

Elementary matrices and matrix manipulation.

# I1 b$ f0 `$ B; s/ n8 b7 p1 _ Elementary matrices.
   zeros       - Zeros matrix.
' p) Z4 Y& J. P- E9 h   ones        - Ones matrix.
   eye         - Identity matrix.
& v3 e; X2 j$ W7 ?0 |   rand        - Uniformly distributed random numbers.
   randn       - Normally distributed random numbers.
   linspace    - Linearly spaced vector.
   logspace    - Logarithmically spaced vector.
   meshgrid    - X and Y arrays for 3-D plots.
   :           - Regularly spaced vector.

Special variables and constants.
  f2 W2 E: @2 q   ans         - Most recent answer.
/ [" D  R& ^- n+ |/ j9 |   eps         - Floating point relative accuracy.
# ?$ x* ]3 f/ i7 j: q7 q, x   realmax     - Largest floating point number.
5 d. W, @3 ?* O* w. U   realmin     - Smallest positive floating point number.
   pi          - 3.1415926535897....
+ P# \0 A$ j2 K1 L   i, j        - Imaginary unit.
: Q, c. A. [: I   inf         - Infinity.
2 c) S) w# j; O5 c8 a7 `2 r; B   NaN         - Not-a-Number.
) C, x: p, a, J   flops       - Count of floating point operations.
   nargin      - Number of function input arguments.
  c. E2 T  E- U; @8 o   nargout     - Number of function output arguments.
! ], |9 s) X3 T   computer    - Computer type.
   isieee      - True for computers with IEEE arithmetic.
/ ]$ I5 F7 J+ w% I: V# [   isstudent   - True for the Student Edition.
   why         - Succinct answer.
   version     - MATLAB version number.

Time and dates.
9 k; l/ O4 @# w3 G1 @   clock       - Wall clock.
' f- _7 M( w% O  K. Q) P   cputime     - Elapsed CPU time.
4 I% w% k* `1 V   date        - Calendar.
6 e0 S5 }! S) I* Y. w2 W. r! v   etime       - Elapsed time function.
9 N' i; M! \, o/ N0 K   tic, toc    - Stopwatch timer functions.
7 e$ L% w8 ]+ E( e
Matrix manipulation.
   diag        - Create or extract diagonals.
   fliplr      - Flip matrix in the left/right direction.
   flipud      - Flip matrix in the up/down direction.
   reshape     - Change size.
, d* S* d& ?6 T! P   rot90       - Rotate matrix 90 degrees.
2 V: t- h0 q" m0 e   tril        - Extract lower triangular part.
   triu        - Extract upper triangular part.
8 B. l& E: F: a; j: M3 j& o   :           - Index into matrix, rearrange matrix.

晓夜寒风

>> help specmat

* c- C' w7 _; P8 I7 ]. z' C. f Specialized matrices.
  G6 O, o6 L: T7 c. L
   compan      - Companion matrix.
! L- a0 B3 s% u, y, W: A8 K$ Z   gallery     - Several small test matrices.
4 z' N9 c7 v, ^# Z6 @1 S   hadamard    - Hadamard matrix.
   hankel      - Hankel matrix.
   hilb        - Hilbert matrix.
   invhilb     - Inverse Hilbert matrix.
   kron        - Kronecker tensor product.
2 u9 [. e4 M) Z$ r, T% P   magic       - Magic square.
6 f# x" W4 G& L1 b" ^) W- I   pascal      - Pascal matrix.
   rosser      - Classic symmetric eigenvalue test problem.
8 X& A0 @$ p* E& V   toeplitz    - Toeplitz matrix.
- @' x/ Z$ n# n2 {+ t   vander      - Vandermonde matrix.
   wilkinson   - Wilkinson's eigenvalue test matrix.
9 E9 K+ D9 o8 X
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) w; n3 A- U( |& D1 N9 i6 r2 t6 ]  H>> help elfun
+ @- H0 l3 V4 G1 o! `9 w. c
Elementary math functions.
2 {, N) [# g* h; W- P8 F2 O
! |  }! n5 S! P6 i% x0 a6 b Trigonometric.
- {: @1 N# u0 b) d) Y; T   sin         - Sine.
   sinh        - Hyperbolic sine.
7 C+ Q) N8 N% _! C   asin        - Inverse sine.
% @4 O1 a# y! o+ z+ g: p   asinh       - Inverse hyperbolic sine.
" d2 C/ b2 t' }+ h9 \3 Q1 C' ^2 A   cos         - Cosine.
   cosh        - Hyperbolic cosine.
   acos        - Inverse cosine.
   acosh       - Inverse hyperbolic cosine.
+ w  l5 n( V: a3 `0 E7 K" l   tan         - Tangent.
   tanh        - Hyperbolic tangent.
   atan        - Inverse tangent.
   atan2       - Four quadrant inverse tangent.
* y+ P2 q9 p" L" k0 _8 \8 I   atanh       - Inverse hyperbolic tangent.
- k  J/ v; o9 ?/ A3 `8 }   sec         - Secant.
   sech        - Hyperbolic secant.
+ l1 M$ ~) [+ e9 U   asec        - Inverse secant.
: ~/ x- F- {0 H# ~   asech       - Inverse hyperbolic secant.
' Y* f' W& U2 u, d! E- |   csc         - Cosecant.
2 L! H: y& b; i# l3 l   csch        - Hyperbolic cosecant.
   acsc        - Inverse cosecant.
   acsch       - Inverse hyperbolic cosecant.
+ b. _4 [1 `& c; }5 H/ C- M   cot         - Cotangent.
   coth        - Hyperbolic cotangent.
' t% J7 `9 s7 V. Z- F+ {0 J   acot        - Inverse cotangent.
" t0 T  d8 k: W( Q& R0 H4 s: ]   acoth       - Inverse hyperbolic cotangent.

Exponential.
; ^* r* Y3 l0 l% U  w3 H   exp         - Exponential.
5 w+ t! c+ Y8 T( N5 d, w& x8 c0 f   log         - Natural logarithm.
   log10       - Common logarithm.
   sqrt        - Square root.

0 t4 i5 i* t% p( g& x" M; V, U9 g Complex.
! j! K- O. g1 A) [7 U' x   abs         - Absolute value.
% V' I: p' w# {) Z7 d% _   angle       - Phase angle.
) F1 a/ I4 I! ]9 m. V4 g   conj        - Complex conjugate.
" e( Z; l6 H' p0 r$ q" Z" l7 A   imag        - Complex imaginary part.
   real        - Complex real part.
- H$ F( \+ i3 g9 s% m2 P; E
9 A$ f* }0 d- P3 B8 N Numeric.
   fix         - Round towards zero.
   floor       - Round towards minus infinity.
   ceil        - Round towards plus infinity.
   round       - Round towards nearest integer.
! d' h( U8 e" M; [. p- U   rem         - Remainder after division.
' S; A- k5 X: W) y+ I3 D   sign        - Signum function.

0 x$ ~* l' T5 ^! k: ~7 p( e
0 y/ S3 ]3 g, T0 \, Q>> help specfun

晓夜寒风

>> help specmat

4 \1 _, n7 E/ w& X2 d Specialized matrices.

6 ^( y8 K/ p5 q. u   compan      - Companion matrix.
3 ?) \( J. a2 x4 X( T: a   gallery     - Several small test matrices.
/ i. H: H, i8 s7 m" D- \8 r4 r+ S$ ~. ?# b   hadamard    - Hadamard matrix.
) X. i  c1 J6 t! [   hankel      - Hankel matrix.
   hilb        - Hilbert matrix.
: o& ^2 m5 S) T% T5 |   invhilb     - Inverse Hilbert matrix.
; c( A6 a; g  |% X9 S   kron        - Kronecker tensor product.
' u% H( a! c) k4 q$ t9 L   magic       - Magic square.
   pascal      - Pascal matrix.
   rosser      - Classic symmetric eigenvalue test problem.
& j0 _. B! w8 ?6 N; w) A   toeplitz    - Toeplitz matrix.
   vander      - Vandermonde matrix.
" H" b: }" n. P9 J$ x   wilkinson   - Wilkinson's eigenvalue test matrix.

% b2 W' o4 N1 J0 F6 X
>> help elfun

Elementary math functions.
0 Y& m. }: W+ n, W" ^
# S) B2 g. a7 l" x& @  i% ^ Trigonometric.
   sin         - Sine.
% T; @9 b4 j9 _7 O, Y) l9 L0 S% E, s   sinh        - Hyperbolic sine.
   asin        - Inverse sine.
   asinh       - Inverse hyperbolic sine.
8 Q: @9 g+ S* e; |+ }% }% \: A9 r   cos         - Cosine.
, x# `" R+ ^  p0 f   cosh        - Hyperbolic cosine.
2 y1 F9 Z; C  h- ?/ K   acos        - Inverse cosine.
9 u4 ^! A0 x7 {   acosh       - Inverse hyperbolic cosine.
3 i8 ]7 A/ Q/ m' B   tan         - Tangent.
   tanh        - Hyperbolic tangent.
: T; v- `0 i+ D7 U: T7 q2 \   atan        - Inverse tangent.
* H& u# J+ j( S% S* N4 R- G   atan2       - Four quadrant inverse tangent.
, p! l+ A% K9 [' b0 z   atanh       - Inverse hyperbolic tangent.
   sec         - Secant.
3 ?4 v& u6 J; V1 w" Q6 v   sech        - Hyperbolic secant.
- |9 C2 s! P3 B/ |   asec        - Inverse secant.
6 m1 }" W$ X6 A1 L. D   asech       - Inverse hyperbolic secant.
   csc         - Cosecant.
   csch        - Hyperbolic cosecant.
. `- J; T0 C. `# ~   acsc        - Inverse cosecant.
8 J. Y8 M8 ]1 l/ B# h/ G( l3 E   acsch       - Inverse hyperbolic cosecant.
   cot         - Cotangent.
   coth        - Hyperbolic cotangent.
" X/ h- z, }1 `: @( M6 i   acot        - Inverse cotangent.
( H7 |! F* G$ e7 A% Y, Q   acoth       - Inverse hyperbolic cotangent.
* r3 m% R  C& [! g6 ^6 i' H
* e* l1 ?/ b$ ?0 e5 \# Q' Z Exponential.
   exp         - Exponential.
1 |  e; j, u4 p- q& o* _8 D   log         - Natural logarithm.
   log10       - Common logarithm.
2 V& Q# l! s1 f9 M+ |   sqrt        - Square root.
+ ^1 v- `+ D2 ?. @
0 L2 x4 i( b$ ~$ V3 ] Complex.
2 z! {: [- }3 ]! a6 G6 y! o. s   abs         - Absolute value.
. c* _( O& x# O; @; w" G( t9 v2 r   angle       - Phase angle.
3 U" l$ ^9 A# P5 D   conj        - Complex conjugate.
   imag        - Complex imaginary part.
; g$ M( O3 F. s2 e   real        - Complex real part.
8 r( X% X1 h# c! P, S) C
Numeric.
   fix         - Round towards zero.
; S2 d, L. l7 a   floor       - Round towards minus infinity.
   ceil        - Round towards plus infinity.
, U3 w1 M2 M" p   round       - Round towards nearest integer.
   rem         - Remainder after division.
   sign        - Signum function.
$ B/ s, l: Y2 i( D' _
0 H0 y* `* q  L+ O, I) L$ \2 t
# d  k" `; T" X, A, {>> help specfun

晓夜寒风

Specialized math functions.
7 |# R: b8 n; _( |" @9 @
' v5 I( [' x5 l, U8 ^1 x   besselj     - Bessel function of the first kind.
3 u! r7 F* j6 H( @   bessely     - Bessel function of the second kind.
   besseli     - Modified Bessel function of the first kind.
8 r1 ]) g- g' b, D+ ~: i  z5 L   besselk     - Modified Bessel function of the second kind.
# g" f3 a# ^" p. {2 b9 [4 u   beta        - Beta function.
   betainc     - Incomplete beta function.
. n$ t# q& t1 T! k   betaln      - Logarithm of beta function.
( F) a. W2 Z; [2 e+ V   elli石皮解      - Jacobi elliptic functions.
( h" ^4 u% U8 E7 a2 W   ellipke     - Complete elliptic integral.
   erf         - Error function.
% s! }0 x) l% g* g1 l   erfc        - Complementary error function.
   erfcx       - Scaled complementary error function.
   erfinv      - Inverse error function.
   expint      - Exponential integral function.
   gamma       - Gamma function.
" M8 b& v% |. `$ z/ f5 I$ H, n- z   gcd         - Greatest common divisor.
- O1 U6 K, C+ o   gammainc    - Incomplete gamma function.
   lcm         - Least common multiple.
   legendre    - Associated Legendre function.
5 |  H4 C7 j5 W% A0 D: v0 y! Z   gammaln     - Logarithm of gamma function.
   log2        - Dissect floating point numbers.
   pow2        - Scale floating point numbers.
   rat         - Rational approximation.
   rats        - Rational output.
" V& i4 W" v, r! e$ f6 X6 ?   cart2sph    - Transform from Cartesian to spherical coordinates.
   cart2pol    - Transform from Cartesian to polar coordinates.
% p2 v  i3 c2 Y& a  l# E0 W6 V   pol2cart    - Transform from polar to Cartesian coordinates.
   sph2cart    - Transform from spherical to Cartesian coordinates.
) U2 |( O: p$ D6 O  n
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/ ~2 I7 H: S3 @; u7 l4 a$ @: g$ w>> help matfun

9 A- B1 P* T3 {2 H Matrix functions - numerical linear algebra.

) k% i+ t- q* B3 w Matrix analysis.
. d4 _  f: c0 v- v; E   cond        - Matrix condition number.
   norm        - Matrix or vector norm.
   rcond       - LINPACK reciprocal condition estimator.
   rank        - Number of linearly independent rows or columns.
1 V4 p6 S; i; {& o8 Q3 a# s1 F1 v' U0 f   det         - Determinant.
% B) y0 o1 x" ~4 m% @   trace       - Sum of diagonal elements.
   null        - Null space.
   orth        - Orthogonalization.
   rref        - Reduced row echelon form.

Linear equations.
9 w; o# S* I' O8 B2 O+ K6 a2 J/ q! r/ l   \ and /     - Linear equation solution; use "help slash".
. a9 b5 ~1 R! U: O& o$ v. _! ], V) Y   chol        - Cholesky factorization.
   lu          - Factors from Gaussian elimination.
8 r1 Z/ K" ?! K* P- O5 O   inv         - Matrix inverse.
* w4 r* h" b  K' i/ E" T& F   qr          - Orthogonal-triangular decomposition.
8 P6 B9 U. Z' T3 n   qrdelete    - Delete a column from the QR factorization.
   qrinsert    - Insert a column in the QR factorization.
   nnls        - Non-negative least-squares.
" Q8 b( a/ V6 G, \" m7 ?   pinv        - Pseudoinverse.
' \0 A% d2 {, e! b+ o  {   lscov       - Least squares in the presence of known covariance.

5 L( x" D5 e# V& `! t4 O Eigenvalues and singular values.
   eig         - Eigenvalues and eigenvectors.
5 z# M; N* X$ v& E0 z   poly        - Characteristic polynomial.
& b8 X! W+ ^: U$ B2 E   polyeig     - Polynomial eigenvalue problem.
   hess        - Hessenberg form.
2 {+ u! h$ j- p7 |( X5 M2 G: {   qz          - Generalized eigenvalues.
" S8 f! m3 s  Y4 h' O   rsf2csf     - Real block diagonal form to complex diagonal form.
( B/ c( N3 M" B+ C   cdf2rdf     - Complex diagonal form to real block diagonal form.
   schur       - Schur decomposition.
: j8 J" s4 P3 H% ?! `   balance     - Diagonal scaling to improve eigenvalue accuracy.
   svd         - Singular value decomposition.

Matrix functions.
" a$ A0 n( b9 e6 u0 J   expm        - Matrix exponential.
   expm1       - M-file implementation of expm.
: x* x7 S/ n' N4 H- A& s8 g   expm2       - Matrix exponential via Taylor series.
/ [# |9 X3 C# o. S' |" b5 t   expm3       - Matrix exponential via eigenvalues and eigenvectors.
" M3 h& j% X  d6 M   logm        - Matrix logarithm.
   sqrtm       - Matrix square root.
( W& }: J) l  T   funm        - Evaluate general matrix function.

晓夜寒风

>> help general
# M3 a5 r, S. g' A* D
4 I2 o) k( s  `  j9 b/ I General purpose commands.
MATLAB Toolbox  Version 4.2a 25-Jul-94

Managing commands and functions.
& W* h+ r1 m( T0 @/ A( t/ E+ O# |: M* I   help        - On-line documentation.
   doc         - Load hypertext documentation.
   what        - Directory listing of M-, MAT- and MEX-files.
# H! m  G( f' N; k1 g3 ^   type        - List M-file.
   lookfor     - Keyword search through the HELP entries.
   which       - Locate functions and files.
   demo        - Run demos.
   path        - Control MATLAB's search path.
6 a, k6 l5 B3 l& ?& {
; a% ~: q- c4 m" R/ S Managing variables and the workspace.
; `- B/ Y' N7 r) [9 S9 w   who         - List current variables.
   whos        - List current variables, long form.
   load        - Retrieve variables from disk.
   save        - Save workspace variables to disk.
   clear       - Clear variables and functions from memory.
   pack        - Consolidate workspace memory.
   size        - Size of matrix.
8 d( B- ]0 L4 U" L   length      - Length of vector.
   disp        - Display matrix or text.

& C* T% o4 s# A- k8 \2 g Working with files and the operating system.
3 K5 C6 |3 E8 b' Y, F) X   cd          - Change current working directory.
   dir         - Directory listing.
" j, w* D. j) G8 y: h0 k2 {1 w   delete      - Delete file.
   getenv      - Get environment value.
1 u6 T* }1 M  `5 l$ Y& ?* Q+ s" N   !           - Execute operating system command.
   unix        - Execute operating system command & return result.
& b) W2 J6 z2 R   diary       - Save text of MATLAB session.

6 h  S0 b% v. {' C$ c# X& r  T+ r Controlling the command window.
   cedit       - Set command line edit/recall facility parameters.
8 Y0 z3 z4 o; K! g   clc         - Clear command window.
1 J9 h  ~; }. ]/ H   home        - Send cursor home.
! B0 Q* P. p8 [" F* ?   format      - Set output format.
   echo        - Echo commands inside script files.
; |0 n' b  ]  w' r# O1 E! A   more        - Control paged output in command window.

Starting and quitting from MATLAB.
   quit        - Terminate MATLAB.
/ ]0 p1 @: w. E   startup     - M-file executed when MATLAB is invoked.
- C! U) x. M7 N% b( o   matlabrc    - Master startup M-file.

General information.
  t- o2 u3 v% y% e. W) m" F   info        - Information about MATLAB and The MathWorks, Inc.
   subscribe   - Become subscribing user of MATLAB.
1 M+ c3 J1 D" a8 V2 X' s( W$ p   hostid      - MATLAB server host identification number.
   whatsnew    - Information about new features not yet documented.
. }, N- m) N& J. U, c   ver         - MATLAB, SIMULINK, and TOOLBOX version information.

晓夜寒风

>> help general
( Z$ c( j+ w# Y+ c0 Y0 W6 M
( w3 D8 f% I+ J General purpose commands.
MATLAB Toolbox  Version 4.2a 25-Jul-94

Managing commands and functions.
3 \: P9 e, E9 R4 o9 M% J; V0 H: x% b   help        - On-line documentation.
   doc         - Load hypertext documentation.
  B# M3 p+ r" G; E; b; ^5 M1 _   what        - Directory listing of M-, MAT- and MEX-files.
   type        - List M-file.
   lookfor     - Keyword search through the HELP entries.
0 r8 o( @$ I. B" Y   which       - Locate functions and files.
   demo        - Run demos.
5 }, X9 K  C8 O8 j- @. Z3 F8 R* {   path        - Control MATLAB's search path.
  L* q; S' J( m4 Q; E( T
Managing variables and the workspace.
   who         - List current variables.
$ ~1 S3 Q# X; O. r, s4 v$ `; w   whos        - List current variables, long form.
   load        - Retrieve variables from disk.
8 r' l5 a$ f0 U! ~1 ?   save        - Save workspace variables to disk.
: Z' }; K) _2 g# r9 U% I0 L   clear       - Clear variables and functions from memory.
   pack        - Consolidate workspace memory.
$ Z8 l) ^- _2 d; \6 ~2 x   size        - Size of matrix.
0 p, t  q; y/ r6 f   length      - Length of vector.
   disp        - Display matrix or text.

Working with files and the operating system.
+ L+ G2 J) q6 b2 K, Z! i* M   cd          - Change current working directory.
" S3 i/ U! e- V+ W# O   dir         - Directory listing.
5 y1 x% D) A+ g4 l   delete      - Delete file.
- G0 Q# P! x  _" S4 i# |6 ~   getenv      - Get environment value.
   !           - Execute operating system command.
) s) S$ U0 M! d) S$ u# F   unix        - Execute operating system command & return result.
; W5 L8 X  E+ ?   diary       - Save text of MATLAB session.

Controlling the command window.
" J: Y, g. K; f! b: ?) v   cedit       - Set command line edit/recall facility parameters.
   clc         - Clear command window.
9 i9 i5 a+ Y7 K- X   home        - Send cursor home.
4 a/ U' ?# p9 X" q8 _3 j   format      - Set output format.
+ d7 O% D, T  h- N. d4 i/ x1 K0 T   echo        - Echo commands inside script files.
+ V6 m! |% B$ ]% q6 S& u& U$ N1 ]   more        - Control paged output in command window.
$ `* J9 D# e3 V0 ^; a* [
3 N; S5 q1 f; V+ } Starting and quitting from MATLAB.
2 W: V. J# T/ }8 y   quit        - Terminate MATLAB.
   startup     - M-file executed when MATLAB is invoked.
   matlabrc    - Master startup M-file.
+ _2 S- S1 _! b
General information.
" N( T! g. B% _8 r2 p   info        - Information about MATLAB and The MathWorks, Inc.
. c0 N; q6 d9 [5 Y( V   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 funfun
) k6 R& r/ z- p' Z% M5 W
0 ~+ b6 ?0 R3 s% n4 Q. a Function functions - nonlinear numerical methods.

   ode23       - Solve differential equations, low order method.
/ B+ m$ T3 D4 b4 b4 G# u   ode23p      - Solve and plot solutions.
7 P6 Y- u* N9 s0 v8 R& H! }8 A   ode45       - Solve differential equations, high order method.
2 i; K" ~$ f2 |! p2 }5 F0 n( c. L   quad        - Numerically evaluate integral, low order method.
& i$ \& a8 v( j" `   quad8       - Numerically evaluate integral, high order method.
   fmin        - Minimize function of one variable.
# S0 y0 D1 e1 l   fmins       - Minimize function of several variables.
   fzero       - Find zero of function of one variable.
2 b) \, i' E; f3 l$ ~. f; @   fplot       - Plot function.

See also The Optimization Toolbox, which has a comprehensive
set of function functions for optimizing and minimizing functions.

晓夜寒风

>> help funfun

Function functions - nonlinear numerical methods.

' c2 }( v0 i( b4 I3 i7 D; U   ode23       - Solve differential equations, low order method.
6 \- z; y) U$ \9 G( \3 H  t8 }% ~   ode23p      - Solve and plot solutions.
8 P$ A0 V' E! ]4 d5 A   ode45       - Solve differential equations, high order method.
4 @. q+ q: N* X; M; M" d   quad        - Numerically evaluate integral, low order method.
4 ~( {" J4 U$ j0 j" T   quad8       - Numerically evaluate integral, high order method.
   fmin        - Minimize function of one variable.
   fmins       - Minimize function of several variables.
   fzero       - Find zero of function of one variable.
   fplot       - Plot function.

* w: [% F  h$ m: g See also The Optimization Toolbox, which has a comprehensive
set of function functions for optimizing and minimizing functions.