matlab编程

E304731541

d=sym(3*x^3-2*x+1);
diff(d,2)
ezplot('cos(x)',[0,pi])//4.2
0 H& T! F1 W3 y, Gezplot('(cos(t))^3','(sin(t))^3',[0,2*pi])//4.3
" L8 B1 P7 k. z+ L/ hezplot('exp(x)+sin(x*y)',[-2,0.5,0,2])//4.4
2 a; V, r- G/ |4 r; x' R/ N fminbnd('x+3*(x^2+cos(x))',-1,1)  //直接求
9 i& Q( a% C. `  ` f=sym('x+3*(x^2+cos(x))');//由导数为零来求解
/ X6 r% v4 s" n% d) Q( Z  ff=solve(diff(f));
subs(f,x,ff),subs(f,x,-1),subs(f,x,-1)
syms x;
int(1/sin(x)^2*cos(x)^2)
syms x z;
int(x/(1+z^2),x)
A=[1,2,3;4,5,6;7,8,9;10,11,12]
: ]  w- T) B# {  G' ~7 pA =
     1     2     3
' c0 P: |: ^. d     4     5     6
     7     8     9
    10    11    12
B=[0,1,1;2,2,1;1,1,1];
0 [( M; b- g/ dA*B
A^3//错误，矩阵的幂必须矩阵的行列相同才行
rref(A)
4 i4 L- B+ Z/ N4 |6 fx=linspace(0,2*pi,30);
y=sin(x);
7 t* S/ v! P/ Rz=cos(x);
, a: _3 O) r; }! vplot(x,y,'r',x,z,'pg')
x=linspace(0,2*pi,30);
y=sin(x);
z=cos(x);
xlabel('自变量x')
ylabel('函数y')
title('示意图')
  Y8 m& p$ O" W% zplot(x,y,'r',x,z,'pg'),grid on;
$ V& p' B0 X" i; J7 Xx=linspace(0,2*pi,30);
y=sin(x);
$ U, q+ J! V8 V2 Y5 C) O4 gz=cos(x);
4 Q9 y2 p# m& |  ~9 a  `plot(x,z,'pg');
hold on;
- y" ]& w1 C8 x5 Splot(x,y,'r')
  w0 ?( i' F* m" L& b5 H' Ax=linspace(0,2*pi,100);
  Y7 s3 X0 J( q/ hy=sin(x);
9 Q1 K' z0 \3 K1 C) s" jz=cos(x);
plot(x,y);
title('sin(x)')
1 u, P: V0 G3 Jpause;
figure(2);
- d* ~3 X1 }# i% |plot(x,z,'pg');
title('cos(x)')
x=linspace(0,2*pi,30);
y=sin(x);
plot(x,y,'r');
zoom on
p=[1 -4 9 -10];
6 V: v+ D; e6 Z+ ?. k1 p. lr=roots(p)//次数小于等于4，若大于4则用该命令不一定能求出所有根的准确形式。
r=solve('x^3-4*x^2+9*x-10=0')//简单方法
r=solve('x^2-a*x-4*b=0','x')
d=solve('p*sin(x)-r','x')
4 V3 k: O9 y+ @1 C; w( |r=fzero('x-(cos(x))^2',1)//其中必须输入的是方程对应的函数名
: u. Y: }5 X1 P  S7 Q( h& n3 L1 v[x,y]=solve('x+y=1','x-11*y=5','x','y')

mrx

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qingqing20072

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qingqing20072

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qingqing20072

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xxj198712

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zhula

2# mrx
谢谢啊！！

zhula

2# mrx
/ t! `6 q1 Y( y; A* R太感谢了

zhula

2# mrx
" d+ z0 h2 [& ~" D- ?- z最近在做有关促销的文章，可以借鉴，３Ｑ

byit

Thanks you~~