matlab编程

E304731541

d=sym(3*x^3-2*x+1);
diff(d,2)
ezplot('cos(x)',[0,pi])//4.2
ezplot('(cos(t))^3','(sin(t))^3',[0,2*pi])//4.3
ezplot('exp(x)+sin(x*y)',[-2,0.5,0,2])//4.4
$ ]- R3 K% W$ G, X- ? fminbnd('x+3*(x^2+cos(x))',-1,1)  //直接求
f=sym('x+3*(x^2+cos(x))');//由导数为零来求解
  ff=solve(diff(f));
; s* p! ~9 ~  i/ T8 {5 @: vsubs(f,x,ff),subs(f,x,-1),subs(f,x,-1)
2 g/ `/ \/ v0 G3 u# ]' J6 Vsyms x;
int(1/sin(x)^2*cos(x)^2)
syms x z;
" z) ~. x0 b3 z, `; Mint(x/(1+z^2),x)
A=[1,2,3;4,5,6;7,8,9;10,11,12]
1 Y( a3 y9 |: Y) m; XA =
7 Z1 n! Y6 r& \3 U6 H     1     2     3
     4     5     6
     7     8     9
    10    11    12
B=[0,1,1;2,2,1;1,1,1];
A*B
A^3//错误，矩阵的幂必须矩阵的行列相同才行
rref(A)
x=linspace(0,2*pi,30);
y=sin(x);
z=cos(x);
8 ?" x, n- Y, B) s+ Tplot(x,y,'r',x,z,'pg')
% K! n- i+ _5 [x=linspace(0,2*pi,30);
% W- {- Y% a. ?y=sin(x);
, L/ J- P( q# v6 c8 H6 ^/ G! Hz=cos(x);
: z6 m# ], s7 [& Q4 m8 A( Nxlabel('自变量x')
ylabel('函数y')
title('示意图')
plot(x,y,'r',x,z,'pg'),grid on;
x=linspace(0,2*pi,30);
y=sin(x);
  T6 q. F) s( G# `1 B, a+ rz=cos(x);
plot(x,z,'pg');
hold on;
plot(x,y,'r')
x=linspace(0,2*pi,100);
y=sin(x);
z=cos(x);
plot(x,y);
% }, g$ k0 Y# R+ _/ r/ m+ |7 @, Mtitle('sin(x)')
" C, L+ f2 z8 ?: ]1 {3 wpause;
figure(2);
plot(x,z,'pg');
title('cos(x)')
+ A! S* B* v" \; }x=linspace(0,2*pi,30);
5 ~6 \* D: ^  N6 u. `y=sin(x);
plot(x,y,'r');
6 g/ w5 ]$ E: [4 l1 q2 [) g# {zoom on
# C3 m6 ~3 |$ Zp=[1 -4 9 -10];
( m4 E- `: l. h7 e/ c/ Y0 y* E9 a4 ~, ^r=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。
7 T, n/ F- h# M! A/ K0 Rr=solve('x^3-4*x^2+9*x-10=0')//简单方法
r=solve('x^2-a*x-4*b=0','x')
: r. ~% B0 T. t3 p, R7 \: Fd=solve('p*sin(x)-r','x')
r=fzero('x-(cos(x))^2',1)//其中必须输入的是方程对应的函数名
: b+ `/ u0 I3 C, b' _  o[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
! W/ h, `1 x! g( B' C8 i太感谢了

zhula

2# mrx
最近在做有关促销的文章，可以借鉴，３Ｑ

byit

Thanks you~~