Matlab數(shù)據(jù)可視化示例

1、 繪制直方圖 x = randn(1000,1; subplot(1,2,1;hist(x; subplot(1,2,2;hist(x,8; 250 300 200 250 200 150 150 100 100 50 50 0 -4 -2 0 2 4 0 -4 -2 0 2 4 6. 離散數(shù)據(jù)圖形：stem(x,y / stairs(x,y / stem3(x,y,z 二維離散圖形、二維階躍圖形、三維離散圖形 x = 0:10:360*pi/180; y = sin(x; subplot(2,2,1;plot(x,y; subplot(2,2,2;stem(x,y; subplot(2,2,

2、3;stairs(x,y; t = 0:0.1:10; s = 0.1+i; y = exp(-s*t; subplot(2,2,4;stem3(real(y,imag(y,t; 1 0.5 0 -0.5 -1 1 0.5 0 -0.5 -1 0 2 4 6 8 0 2 4 6 8 1 0.5 0 -0.5 -1 10 5 0 1 0 0 2 4 6 8 -1 -1 0 1 7. 等值線圖：contour(x,y,z,n 繪制二維等值線 n = -2:0.2:2; X,Y,Z = peaks(n; contour(X,Y,Z,10; 2 1.5 1 0.5 0 -0.5 -1 -1.5 -2

3、-2 -1.5 -1 -0.5 0 0.5 1 1.5 2 8.等值線圖（符號(hào)函數(shù)）： ezcontour(f, domain,n / ezcontourf(f,domain,n 繪制符號(hào)函數(shù)的等值線。 繪制函數(shù) f ( x, y = 3(1 - x 2 e- x 2 -( y +12 2 2 2 2 x 1 - 10( - x3 - y 5 e- x - y - e-( x +1 - y 5 3 syms x y; f = 3*(1-x2*exp(-(x2-(y+12. -10*(x/5-x3-y5*exp(-x2-y2. -1/3*exp(-(x+12-y2; subplot(1,2,1;

4、ezcontour(f,-3,3,49;title('contour' subplot(1,2,2;ezcontourf(f,-3,3,49; title('filled contour' contour 3 3 filled contour 2 2 1 1 0 0 y -1 y -2 0 x 2 -1 -2 -2 -3 -3 -2 0 x 2 9. 矢量圖：quiver(x,y,u,v 繪制矢量像(x,y是坐標(biāo)，(u,v是待繪制的矢量 n = -2:0.2:2; X,Y,Z = peaks(n; contour(X,Y,Z,10; U, V = gradient(Z, 0.2; hold on quiver(X,Y,U,V; contour 3 2