matlab怎么做效率曲线图,matlab做曲线图参考资料（matlab
做曲线图参考资料）
matlab做曲线图参考资料(matlab做曲线图参考资料)
matlab做曲线图参考资料(matlab做曲线图参考资料) They can be used in combination. For example, “b-.“ stands for blue dot lines, “y:d“ stands for yellow dashes, and marks data points with diamond characters. When the option is omitted, the MATLAB specifies that the lines are all solid lines, and the colors will follow the order of the curves. To set the curve style, you can add a drawing option to the plot function, with the call at as: Plot (x1, Y1, option 1, X2, Y2, option 2,. Xn, YN, option n) Example 1-6 in the same coordinate, the curves y1=0.2e-0.5xcos (4 PI x) and y2=2e-0.5xcos (PI x) are plotted with different linear shapes and colors respectively, and the intersection points of the two curves are marked. Procedures are as follows: X=linspace (0,2*pi, 1000); Y1=0.2*exp (-0.5*x).*cos (4*pi*x); Y2=2*exp (-0.5*x).*cos (pi*x); K=find (ABS (y1-y2) <1e-2);% lookup Y1 and Y2 equal (approximately equal) subscript X1=x (k);% takes the X coordinate of Y1 and Y2 Y3=0.2*exp (-0.5*x1).*cos (4*pi*x1);% Y1 y coordinates equal to Y2 values Plot (x, Y1, x, Y2, k: , x1, Y3, bp ); 1.4 graphics annotation
and coordinate control 1. graphic annotation The at of the graph annotation function is called: Title (gra
phical name) Xlabel (x axis specification) Ylabel (Y axis specification) Text (x, y, graphical instructions) Legend (Legend 1, legend 2,. ) The text in the function, in addition to using standard ASCII characters, you can also use LaTeX at control characters, so that you can add Greek letters, mathematical symbols and ulas on the graphics. For example, text (0.3,0.5, sin ({\omega}t+{\beta})) will get the annotation effect sin (omega t+ beta). In 0 cases of 1-7 = x = 2p interval and y2=cos curve y1=2e-0.5x (4 PI x), and to add graphics graphics mark. Procedures are as follows: X=0:pi/100:2*pi; Y1=2*exp (-0.5*x); Y2=cos (4*pi*x); Plot (x, Y1, x, Y2) Title ( x from 0 to 2{\pi} );% plus graphic title Xlabel ( Variable X );% plus X axis description Ylabel ( Variable Y );%
plus Y axis description Text (0.8,1.5, curve y1=2e^{-0.5x} );% adds graphical descriptions at the specified location Text (2.5,1.1, curve y2=cos (4{\pi}x) ); Legend (` Y1 , ` Y2 )% plus legend 2. coordinate control The call at of the axis function is: Axis ([xmin, xmax, Ymin, ymax, Zmin, zmax]) The axis function is rich in functionality, as well as in the usual ats: Axis equal: the vertical and horizontal axes are equal length scales. Axis Square: produces a square coordinate system (defaults to rectangles). Axis Auto: use default settings. Axis off: cancel the coordinate axis. Axis on: display axis. Give coordinates and mesh lines, and use the grid command to control. The grid on/off command controls whether to draw or not to draw the grid line, and the grid command without param
eters switches between the two states. Add borders to the coordinates and use the box command to control them. The box on/off command controls whether to add or not to the border line, and the box command without arguments switches between the two states. Example 1-8 in the same coordinate, you can draw 3 concentric circles, plus coordinate control. Procedures are as follows: T=0:0.01:2*pi; X=exp (i*t); Y=[x; 2*x; 3*x] ; Plot (y) Grid on;% plus mesh lines Box on;% plus coordinate borders Axis equal% coordinate axes are used equal scale 1.5 visual editing of graphics The MATLAB 6.5 version provides visual graphical editing tools in the graphical window, which can be used to edit various graphics objects in the window by using commands in the graphical window, menu bar, or toolbar.
There is a menu bar and toolbar on the graphical window. The menu bar contains 7 menu items in File, Edit, View, Insert, Tools, Window, and Help. The toolbar contains 11 command buttons. 1.6 drawing function of adaptive sampling of
functions The call at of the fplot function is: Fplot (fname, LIMS, tol, options) Where fname is the function name, in the of string, LIMS is x, y value range, tol is relative allowable error, and its system default value is 2e-3. The option definition is
the same as the plot function. Example 1-9 draws the curve of F (x) =cos (Tan (PI x)) with the fplot function. The commands are as follows: Fplot ( cos (Tan (pi*x)) , [0,1], 1e-4] 1.7 segmentation of graph window The call at of the subplot function is: Subplot (m, N, P) This function divides the current graphics window into m * n drawing areas, that is, each line is n, m lines
in all, the area code is numbered by line, and the first p area is selected as the active area. In each drawing area, graphics are allowed to be drawn separately in different coordinate systems. Example 5-10 in the graphical window, a number of curves are plotted simultaneously in the of subgraphs. Two. Other two-dimensional graphics 2.1 2D data curves under other coordinate systems 1. logarithmic coordinate graphics MATLAB provides functions for plotting logarithmic and semi logarithmic coordinate curves: Semilogx (x1, Y1, option 1, X2, Y2, option 2,. ) Semilogy (x1, Y1, option 1, X2, Y2, option 2,. ) Loglog (x1, Y1, option 1, X2, Y2, option 2,. ) 2. polar diagram The polar function is used to plot polar coordinates. The at
of the call is: Polar (theta, rho, options) Where theta is the polar polar angle, Rho polar radius, content and function of similar options plot. Example 1-12 draws the polar diagram of r=sin (T) cos (T) and marks the data points. Procedures are as follows: T=0:pi/50:2*pi; R=sin (T).*cos (t); Polar (T, R, -* ); 2.2 two-dimensional statistical analysis chart In MATLAB, there are many two-dimensional sta
tistical analysis graphs, such as bar graphs, ladder diagrams, bar graphs and filling graphs, etc. the functions used are: Bar (x, y, options) Stairs (x, y, options) Stem (x, y, options) Fill (x1, Y1, option 1, X2, Y2, option 2,. ) Example 1-13 draw the curve y=2sin (x) with bar chart, ladder diagram, bar chart and filling chart respectively. Procedures are as follows: X=0:pi/10:2*pi; Y=2*sin (x); Subplot (2,2,1); bar (x, y, g ); Title ( bar (x, y, g )); axis ([0,7, -2,2]);
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