plot () function summary

plot () function summary

Input:

Input parameters are matrix plot function;

• vector x n x 1; y: have the same dimensions and a x, such as mxn.
  • The number of images is m; x is the abscissa; for each row element y ordinate;
• x, y is the matrix with dimension: mxnX corresponds to a column of elements - the abscissa; the corresponding list of elements Y - ordinate;
• plot (x): If x is MXN;
  • Solid matrix: for the n-number of the image; ordinal number as abscissa; the value of the ordinate corresponding to each column
  • Complex matrix: for the n-number of the image; abscissa is the real part of the element; the imaginary part of the element ordinate

Example Program

t = (0: pi/50 :2*pi)''	% t为101x1维矩阵；
k = 0.4:0.1:1			% k为1x7维矩阵；
y = cos(t)*k			% y为101x7维矩阵；

plot(y)		
% 输入3；以下标1-101为横坐标；对应的值为纵坐标；画出七条图像

plot(t, y)	
% 输入1；t和y公共的为101；故以t的值为横坐标；y中以对应的每一列为纵坐标；共画出7条图像；

image

• plot(y)

• plot(t, y)

Image style options

• b-. He represents the blue dotted line
• y:d Yellow dotted line represents, marked by diamonds and data points;
• default Line - solid line; Color - sequentially according to the order of the curve is provided;
• Setting method:plot( x1, y1, 选项1, x2, y2, 选项2.... )

Graphing having two longitudinal coordinates;

• plotyy( x1, y1, x2, y2 ): To the left and right longitudinal draw two different curves;
• plotyy( x1, y1, x2, y2, fun1, fun2 ): Longitudinal draw two different right and left curves, curves are determined by the form fun1, fun2;
  • x1, y1 corresponding to a curve (left ordinate)
  • x2, y2 corresponding to a curve (right ordinate)

For example

plotyy( x, y1, x, y2, 'semilogy', 'plot' )

The left is logarithmic; the right is the Cartesian coordinates;

Other commands

• hold on: Keep the original layer (as a background)
• hold off: Refresh the original layer
  • If two plot functions; the default is to retain the last one; so this time hold on command can be helpful;
• fplotFunction, ezplotfunction;

fplot(@(x)(x.^2.*sin(x.^2-x-2)),[-2,2]);
ezplot('x.^2.*sin(x.^2-x-2)',[-2,2]);
% ezplot更适合做隐函数相关的操作；

In Matlab plot, fplot, ezplot to use and differences

Introduction to ezplot function

Introduction fplot function