MATLAB study notes (c) Advanced Drawing

Note in some images, and video codes from the B station PPT teacher Guo Yanfu

Advanced Drawing

Advanced 2D drawing (important function instruction)

• FIG logarithm plot of the number of
• plotyy
• histogram chart (overall)
• bar charts charts (individual)
• pie charts pie charts
• ploar chart (similar to the polar diagram)
• stairs and stem charts
• boxplot and error bar
• fill color fill and text

Match colors

• imagesc
• colorbar
• colormap

3D mapping function

• plot3(x,y,z)

• 3D surface plot：
  1 meshgrid()
  2 mash()和surf()
  3 contour()
  4 meshc() 和surfc()
  5view()
  6light()
  7patch()

1.1 pairs logarithmic plot

semilogx (x, y): x-axis the logarithm
loglog (x, y): xy axes are logarithmic
set (gca, 'XGrid', 'on'); plus mesh

x=logspace(-1,1,100);
y=x.^2;
subplot(2,2,1); plot(x,y);title(‘Plot’);
subplot(2,2,2); semilogx(x,y);title(‘Semilogx’);
subplot(2,2,3); semilogy(x,y);title(‘Semilogy’);
subplot(2,2,4); loglog(x,y);title(‘LogLog’);

1.2
plotyy ()

1.3histogram
hist(x,n)

1.4

• bar (y)
• bar3 (y)

bar (y, 'stacked') ; stacked
barh (y); sideways

x=[1 2 5 4 8];
y=[x;1:5];
barh(y,‘stacked’);

Pie chart 1.5

• pie();

a = [May 10 20 30];
pie3 (a, [1,1,1,1]);

1.6

• polar (theta, r); where theta is the angle, r is the radius of

• stairs(y)
• stem (s)

doubt?

1.7

• boxplot(x,y)
• errorbar (x, y, e) where e is the error section

1.8

• fill()

t=linspace(0,2*pi,5);
x=sin(t);
y=cos(t);
h=fill(x,y,‘y’);axis square off;
set(h,‘linewidth’,7);
text(0,0,‘WAIT’,‘Color’,‘k’,‘FontSize’,70,…
‘FontWeight’,‘bold’,‘HorizontalAlignment’,‘center’);

2.0
[the RGB]
255 corresponding to the FF

2.1

• the imagesc () indicates color value

2.2

• the colorbar () displays a color numerical value corresponding to the next article in the axis
• colormap (Name) value corresponds to the color change
  

x=[1:10;3:12;5:14];
imagesc(x);
colorbar;
map=zeros(256,3);
map(:,2)=(0:255)/255;
colormap(map);

3.0

3.1

• plot3(x,y,z)

t=0:pi/50:10*pi;
plot3(sin(t),cos(t),t);
grid on;axis square;box on

turns=40pi;
t=linspace(0,turns,4000);
x=cos(t).(turns-t)./turns;
y=sin(t).*(turns-t)./turns;
z=t./turns;
plot3(x,y,z);
grid on;

3.2

• [X,Y]=meshgrid(x,y) 使用这个函数可以得到两个有对应点的矩阵

3.3

• mesh（）没有小格子和surf（）有小格子

3.4

• contour（）有点类似于投影，让3D变成2D

有一页看不懂

3.5

• meshc()和surfc()
• 3D加2D

3.6

• view（x,y)
• x,y是想看的角度
• [X,Y,Z]=sphere(30)，其中参数30表示球面沿着经度、纬度方向被分成的面片数。
• shading 设置颜色着色属性
• shading flat 每个网格线段和面具有恒定颜色，该颜色由该线段的端点或该面的角边处具有最小索引的颜色值确定。
• material就是让做出的表面图有质地感，包括亮度，暗度，金属感等等。
• material SHINY makes the objects shiny.

3.7

• light(‘position’,[ ])
• shading interp by interpolating lines of each color plane or FIG index or true color values ​​to change the color of the line or plane.

3.8

• patch () draw a polygon