matlab中帮助命令

一 help的直接使用

HELP topics

matlab\general       -  General purpose commands.

matlab\ops           -  Operators and special characters.

matlab\lang          -  Programming language constructs.

matlab\elmat         -  Elementary matrices and matrix manipulation.

matlab\elfun         -  Elementary math functions.

matlab\specfun       -  Specialized math functions.

matlab\matfun        -  Matrix functions - numerical linear algebra.

matlab\datafun       -  Data analysis and Fourier transforms.

matlab\polyfun       -  Interpolation and polynomials.

matlab\funfun        -  Function functions and ODE solvers.

。。。。。。。

二 help+函数（）

>> help elfun

  Elementary math functions.

 

  Trigonometric.

    sin         - Sine.

    sind        - Sine of argument in degrees.

    sinh        - Hyperbolic sine.

    asin        - Inverse sine.

    asind       - Inverse sine, result in degrees.

    asinh       - Inverse hyperbolic sine.

    cos         - Cosine.

    cosd        - Cosine of argument in degrees.

    cosh        - Hyperbolic cosine.

    acos        - Inverse cosine.

    acosd       - Inverse cosine, result in degrees.

    acosh       - Inverse hyperbolic cosine.

    tan         - Tangent.

    tand        - Tangent of argument in degrees.

    tanh        - Hyperbolic tangent.

    atan        - Inverse tangent.

    atand       - Inverse tangent, result in degrees.

    atan2       - Four quadrant inverse tangent.

    atanh       - Inverse hyperbolic tangent.

    sec         - Secant.

    secd        - Secant of argument in degrees.

    sech        - Hyperbolic secant.

    asec        - Inverse secant.

    asecd       - Inverse secant, result in degrees.

    asech       - Inverse hyperbolic secant.

    csc         - Cosecant.

    cscd        - Cosecant of argument in degrees.

    csch        - Hyperbolic cosecant.

    acsc        - Inverse cosecant.

    acscd       - Inverse cosecant, result in degrees.

    acsch       - Inverse hyperbolic cosecant.

    cot         - Cotangent.

    cotd        - Cotangent of argument in degrees.

    coth        - Hyperbolic cotangent.

    acot        - Inverse cotangent.

    acotd       - Inverse cotangent, result in degrees.

    acoth       - Inverse hyperbolic cotangent.

 

  Exponential.

    exp         - Exponential.

    expm1       - Compute exp(x)-1 accurately.

    log         - Natural logarithm.

    log1p       - Compute log(1+x) accurately.

    log10       - Common (base 10) logarithm.

    log2        - Base 2 logarithm and dissect floating point number.

    pow2        - Base 2 power and scale floating point number.

    realpow     - Power that will error out on complex result.

    reallog     - Natural logarithm of real number.

    realsqrt    - Square root of number greater than or equal to zero.

    sqrt        - Square root.

    nthroot     - Real n-th root of real numbers.

    nextpow2    - Next higher power of 2.

 

  Complex.

    abs         - Absolute value.

    angle       - Phase angle.

    complex     - Construct complex data from real and imaginary parts.

    conj        - Complex conjugate.

    imag        - Complex imaginary part.

    real        - Complex real part.

    unwrap      - Unwrap phase angle.

    isreal      - True for real array.

    cplxpair    - Sort numbers into complex conjugate pairs.

 

  Rounding and remainder.

    fix         - Round towards zero.

    floor       - Round towards minus infinity.

    ceil        - Round towards plus infinity.

    round       - Round towards nearest integer.

    mod         - Modulus (signed remainder after division).

    rem         - Remainder after division.

    sign        - Signum.

 

 SIN    Sine.

    SIN(X) is the sine of the elements of X.

 

    See also asin, sind.

    Overloaded functions or methods (ones with the same name in other directories)

       help sym/sin.m

    Reference page in Help browser

       doc sin

 三当用户不知确切的函数名时，可以使用lookfor,用来进行关键字搜索

四 另外一些常用的

  exist//变量或函数检验函数

 what //目录中文件列表

  whos//内存变量详细列表

  dir //当前路径中文件及文件夹列表