MATLAB builds the foundation of charts

Plot () function: Just specify the Parameter

Plot (x, y) to draw the image, X is the X coordinate, Y is the Y coordinate

Requirement: X and Y are vectors of the same length?

Special usage:

A; X is the vector, Y is the matrix, and the length of the period one-dimensional and X is the same

 1 x=0:0.1:8; 2  3 y=sin(x); 4  5 plot(x,y) 6  7 >> x=0:0.1:8; 8  9 >> y1=sin(x);10 11 >> y2=cos(x);12 13 >> z=[y1;y2];14 15 >> plot(x,z); 

 

B: Use parameters to express different colors and States

1 x=0:0.1:2*pi;2 3 y=sin(x);4 5 plot(x,y,‘b‘);

 

Parameters can be used together

B blue (blue). Point (point)-solid (solid line)

G Green (green) O circle (circle): dotted (DOT line)

R red (red) x-mark (Cross)-. dashdot (DOT draw line)

C cyan (dark green) + plus (plus sign) -- dashed (dotted line)

M magenta (purple) * Star (asterisk) (none) No line

Y yellow (yellow) s square (square)

K black (black) d Diamond (diamond)

C: graphic Annotation

Title ('text', 'property1', propertyvalue1, 'property2', propertyvalue2 ,...)

The image name is displayed on the top. You can use
Title ('parabolic ', 'color', 'R', 'fontsize', 20 );
Set question font size and color

 

Xlabel ('text'): X axis Annotation

Yalvel ('text'): Y axis Annotation

Text (X, Y, 'string') adds the string in quotes to the location specified by the point (x, y) x and y must be numbers of class double. Legend

Legend () Create icon

1 x = 0: 0. * PI; 2 3 Y = sin (x); 4 5 plot (x, y); 6 7 xlabel ('abscissa '); 8 9 ylabel ('ordinate '); 10 11 Title ('sin function image', 'color', 'R', 'fontsize', 20); % Title 12 13 text (4,0, '\ leftarrow y = sin (x)'); % write something in the position on the graph 14 15 legend ('sin'); 16 17

 

D: Coordinate Control

Xlim ([xmin xmax])

Ylim ([xmin xmax]) % controls the coordinate range displayed in the chart

There are other similar functions: Adjusting the coordinate axis shape and so on.

 

E: graphic persistence

 

1 x = 0: 0. 1: 4 * PI; 2 y = sin (x); 3 y2 = cos (x); 4 hold on 5 plot (x, Y2); 6 plot (x, y ); % draw two images. If there is no hold on above, a y will be generated. Hold on means holding different images in a coordinate axis 7 xlabel ('abscissa '); 8 ylabel ('ordinate '); 9 Title ('sin function image', 'color', 'R', 'fontsize', 20); % Title 10 text, '\ leftarrow y = sin (x)'); % write something in the position on the graph 11 legend ('sin ');

 

F: Split display of images

The subplot (MNP) function is used to plan multiple functions created together.

 

1 x = 1:0. 1: 6; 2 y = x; 3 Y1 = sin (x); 4 y2 = cos (x); 5 Y3 = Log (x); 6 subplot (221) % is divided into 2*2 squares, and the graph is placed in the first 7 plot (x, y); 8 subplot (222) % is divided into 2*2 squares, place the graph in the second 9 plot (x, Y1); 10 subplot (223) % Into A 2*2 square, and place the graph in the third 11 plot (x, Y2 ); 12 subplot (224) % is divided into 2*2 squares, and the graph is placed in the fourth 13 plot (x, Y3 );