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MATLAB ????????

MATLAB ?????????????????????????????????????

????????

1. plot ??

plot ???????????????????????? plot ????????

?1????? plot ???????

plot(x)

• ?????

  • x ????????????????????????????????????

• ???

x = [6, 4, 2, 5, 3];plot(x, '-*')

• ???
  ? x ?????????????????????????????????????? *?

?2????????

? x ???????plot ??????????????????????

x = [2.5, 3.6, 5.8, 9.0];y = [3.5, 1.2, 6.3, 8.2];cx = x + y * i;  % ??? complex(x, y)plot(cx, '-*')

• ???
  ????? cx ???????????????????????

2. plot ????

plot ????????????????????

?1? plot(x, y)

• ?????

  • x ? y ??? x ??? y ????????????????

• ???

x = [2.5, 1.2, 3.6, 5.8, 9.0];y = [3.5, 4.5, 1.2, 6.3, 8.2];plot(x, y, '*-')

• ???
  ? x ? y ????????????????????????? o?????? -?

?2? plot ?????????

• ?????
  plot ???????????????

plot(t1, sin(t1), t2, sin(t2) + 1, t3, sin(t3) + 2)

• ???
  ???? t ?????????? sin(t) ?????????

?3? plot ???????

• ?????

  ? y ?????plot ????? y ??????????????
  • ? y ????? x ?????? x ?????? y ??????????????
  • ? y ????? x ?????? x ?????? y ??????????????

• ???

x = linspace(0, 2 * pi, 100);y = [sin(x); sin(2 * x); sin(0.5 * x)];plot(x, y)

• ???
  ??????????? sin(x)?sin(2x) ? sin(0.5x)?

3. fplot ??

fplot ?????????????????????????????

?1??????

fplot(@(x) sin(1/x), [0, 0.2], 'b')

• ?????

  • f?????????? @(x) expression ???
  • lims?x ???????? [xmin, xmax]????? [-5, 5]?
  • ???? plot ????????????????

• ???

  ???? f(x) = sin(1/x) ? [0, 0.2] ???????????????

?2???????

• ?????
  fplot ????????????

fplot(@(t) t * sin(t), @(t) t * cos(t), [0, 10 * pi], 'r')

• ???
  ?????????? x = t * sin(t) ? y = t * cos(t)???????

?????????????

1. ?????

• ?????

  • semilogx?x ?????????y ???????
  • semilogy?x ???????y ?????????
  • loglog?x ?? y ??????????

• ???

x = 0:0.1:10;y = 1 ./ x;subplot(2, 2, 1)plot(x, y)title('?????')grid onsubplot(2, 2, 2)semilogx(x, y)title('?????')grid onsubplot(2, 2, 3)semilogy(x, y)title('y ?????')grid onsubplot(2, 2, 4)loglog(x, y)title('???????')grid on

• ???
  ???? 1/x ???????x ??????y ??????????????

2. ????

• ?????polar(theta, rho, option)

• ?????

  • theta??????? [0, 2 * pi]?
  • rho????????
  • option?? plot ????????????????

• ???

t = 0: pi / 100: 2 * pi;r = 1 - sin(t);subplot(1, 2, 1)polar(t, r)title('????')t1 = t - pi / 2;r1 = 1 - sin(t1);subplot(1, 2, 2)polar(t1, r1)title('??????')

• ???
  ??????????????? t ??? r ????

???????

1. ???

• ?????bar(y, style)

• ?????

  • y??????
  • style???????? 'grouped'??????? 'stacked'???????

• ???

y = [1, 2, 3, 4, 5; 1, 2, 1, 2, 1; 5, 4, 3, 2, 1];subplot(1, 2, 1)bar(y, 'grouped')title('?????')subplot(1, 2, 2)bar(y, 'stacked')title('?????')

• ???
  ???????????????????????????

?????

• ?????hist(y)

• ?????

  • y????????
  • x???????????????????? 10 ????????

• ???

y = randn(500, 1);subplot(2, 1, 1)hist(y)title('???????')x = -3:0.2:3;hist(y, x)title('???????')

• ???
  ????????????????????????????????

???????

1. ???

• ?????pie(x, explode)

• ?????

  • x??????
  • explode??????????????????

• ???

score = [5, 17, 23, 9, 4];ex = [0, 0, 0, 0, 1];pie(score, ex)legend('location', 'eastoutside')

• ???
  ??????????????????????

???????

1. ???

• ?????scatter(x, y, option)

• ?????

  • x ? y?????????????
  • option?? plot ??????????????????

• ???

t = 0: pi / 50: 2 * pi;x = 16 * sin(t)^3;y = 13 * cos(t) - 5 * cos(2 * t) - 2 * cos(3 * t) - cos(4 * t);scatter(x, y, 'rd', 'filled')title('???')

• ???
  ????????????????????

???????

1. ???

• ?????quiver(x, y, u, v)

• ?????

  • x ? y????????
  • u ? v????????

• ???

A = [4, 5];B = [-10, 0];C = A + B;hold on;quiver(0, 0, A(1), A(2));quiver(0, 0, B(1), B(2));quiver(0, 0, C(1), C(2));text(A(1), A(2), 'A');text(B(1), B(2), 'B');text(C(1), C(2), 'C');axis([-12, 6, -1, 6]);grid on

• ???
  ???? A?B ??????? C??????????????????

??? MATLAB ?????????????????? plot?fplot ?????????????????

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