matlab快速入门1.5.docVIP

1.5 MATLAB 的在线帮助系统 MATLAB提供了大量的函数和命令，如果想记住所有的函数及其调用格式几乎是不可能的。为此，MATLAB提供了非常方便的在线帮助的功能，用户可以容易地获得对想查询的各个函数的信息。在线查询可以由命令help来获得。 1.5.1 查询某一命令或函数 如果你要对某一命令或函数进行查询，直接在help后跟上该命令或函数名即可，即用下列程序 help 函数（命令）名 可得到帮助，例如 》help feval 屏幕显示内容如下： FEVAL Execute function specified by string. If F is a string containing the name of a function (usually defined by an M-file), then FEVAL(F,x1,...,xn) evaluates that function at the given arguments. For example, F = foo, FEVAL(F,9.64) is the same as foo(9.64). FEVAL is usually used inside functions which have the names of other functions as arguments. Examples include FZERO and EZPLOT. [y1,..,yn] = FEVAL(F,x1,...,xn) returns multiple output arguments. Within methods that overload built-in functions, use BUILTIN(FUN,...) to execute the original built-in function. See also BUILTIN. Overloaded methods help inline/feval.m 1.5.2 查询MATLAB所有的主题 单独使用help命令，MATLAB将列出所有的主题。即 》help 屏幕显示内容如下： 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. matlab\sparfun - Sparse matrices. matlab\graph2d - Two dimensional graphs. matlab\graph3d - Three dimensional graphs. matlab\specgraph - Specialized graphs. matlab\graphics - Handle Graphics. matlab\uitools - Graphical user interface tools. matlab\strfun - Character strings. matlab\iofun - File input/output. matlab\timefun - Time and dates. matlab\datatypes - Data types and structures. matlab\winfun - Windows Operating System I