matlab画图的M文件建在哪里

Answer 1

在默认matlab安装文件夹：/toolbox/matlabgraph2d/里

输入open plot打开plot.m
%PLOT Linear plot.
% PLOT(X,Y) plots vector Y versus vector X. If X or Y is a matrix,
% then the vector is plotted versus the rows or columns of the matrix,
% whichever line up. If X is a scalar and Y is a vector, length(Y)
% disconnected points are plotted.
%
% PLOT(Y) plots the columns of Y versus their index.
% If Y is complex, PLOT(Y) is equivalent to PLOT(real(Y),imag(Y)).
% In all other uses of PLOT, the imaginary part is ignored.
%
% Various line types, plot symbols and colors may be obtained with
% PLOT(X,Y,S) where S is a character string made from one element
% from any or all the following 3 columns:
%
% b blue . point - solid
% g green o circle : dotted
% r red x x-mark -. dashdot
% c cyan + plus -- dashed
% m magenta * star (none) no line
% y yellow s square
% k black d diamond
% v triangle (down)
% ^ triangle (up)
% < triangle (left)
% > triangle (right)
% p pentagram
% h hexagram
%
% For example, PLOT(X,Y,'c+:') plots a cyan dotted line with a plus
% at each data point; PLOT(X,Y,'bd') plots blue diamond at each data
% point but does not draw any line.
%
% PLOT(X1,Y1,S1,X2,Y2,S2,X3,Y3,S3,...) combines the plots defined by
% the (X,Y,S) triples, where the X's and Y's are vectors or matrices
% and the S's are strings.
%
% For example, PLOT(X,Y,'y-',X,Y,'go') plots the data twice, with a
% solid yellow line interpolating green circles at the data points.
%
% The PLOT command, if no color is specified, makes automatic use of
% the colors specified by the axes ColorOrder property. The default
% ColorOrder is listed in the table above for color systems where the
% default is blue for one line, and for multiple lines, to cycle
% through the first six colors in the table. For monochrome systems,
% PLOT cycles over the axes LineStyleOrder property.
%
% If you do not specify a marker type, PLOT uses no marker.
% If you do not specify a line style, PLOT uses a solid line.
%
% PLOT(AX,...) plots into the axes with handle AX.
%
% PLOT returns a column vector of handles to lineseries objects, one
% handle per plotted line.
%
% The X,Y pairs, or X,Y,S triples, can be followed by
% parameter/value pairs to specify additional properties
% of the lines. For example, PLOT(X,Y,'LineWidth',2,'Color',[.6 0 0])
% will create a plot with a dark red line width of 2 points.
%
% Backwards compatibility
% PLOT('v6',...) creates line objects instead of lineseries
% objects for compatibility with MATLAB 6.5 and earlier.
%
% See also PLOTTOOLS, SEMILOGX, SEMILOGY, LOGLOG, PLOTYY, PLOT3, GRID,
% TITLE, XLABEL, YLABEL, AXIS, AXES, HOLD, LEGEND, SUBPLOT, SCATTER.

% If the NextPlot axes property is "replace" (HOLD is off), PLOT resets
% all axes properties, except Position, to their default values,
% deletes all axes children (line, patch, text, surface, and
% image objects), and sets the View property to [0 90].

% Copyright 1984-2004 The MathWorks, Inc.
% $Revision: 5.19.4.4 $ $Date: 2004/02/01 22:03:02 $
% Built-in function.

Answer 2

一般建在“当前工作目录”，即Matlab\Work\下，可以直接运行。
如果在其他目录下，需要将“当前工作目录”设置到M文件所在文件夹，才能运行该M程序

Answer 3

switch模块。
中间的u2是控制端，点击右键进入属性可以设置判断方式和阈值。
当u2满足switch的条件时，switch输出u1的值；如果不满足，switch输出u3的值。

Answer 4

所有的m文件默认都保存在work目录下，除非你更改保持位置。

画图命令一般包含在m文件的程序中，难道要另外保存画图文件？！没必要吧