matlab编程

E304731541

d=sym(3*x^3-2*x+1);
* d  N7 o9 Q: Y8 _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
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));
subs(f,x,ff),subs(f,x,-1),subs(f,x,-1)
$ A8 W! L9 |" @9 t- Z) Dsyms x;
9 ~6 L4 s# I$ Eint(1/sin(x)^2*cos(x)^2)
6 ^/ V( F! l) j5 o1 e8 Y6 msyms x z;
int(x/(1+z^2),x)
A=[1,2,3;4,5,6;7,8,9;10,11,12]
A =
. K9 C# {  g' j4 z5 t3 z     1     2     3
* `" X" Z2 ?4 M     4     5     6
     7     8     9
9 [7 T6 P0 G' H/ u! l5 E; Q    10    11    12
, z' ^8 o2 t9 b& oB=[0,1,1;2,2,1;1,1,1];
A*B
; e! \& V1 M5 |1 DA^3//错误，矩阵的幂必须矩阵的行列相同才行
rref(A)
" h8 ~% s. f6 `& y- I( @x=linspace(0,2*pi,30);
+ j2 b5 J* B7 _# T4 _/ ny=sin(x);
z=cos(x);
6 V7 H) X5 s2 d% {plot(x,y,'r',x,z,'pg')
- E8 O8 L" ~# U7 c, j2 Mx=linspace(0,2*pi,30);
y=sin(x);
% E/ a. f0 \" [/ r5 t: q$ wz=cos(x);
xlabel('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);
$ g% E* r2 ?3 ]5 A$ r! Ly=sin(x);
z=cos(x);
plot(x,z,'pg');
" g$ e; F- ~0 hhold on;
0 n0 D% _" D4 b' B2 t& {* [9 H. k; Fplot(x,y,'r')
x=linspace(0,2*pi,100);
/ S. D; M1 a4 I+ j7 py=sin(x);
/ s  c+ Z* W  Tz=cos(x);
, t/ N! D. |; l* Q7 F" x3 Dplot(x,y);
title('sin(x)')
pause;
5 \" m7 W, \6 R" o  Afigure(2);
plot(x,z,'pg');
' {% o- e2 }% y- ^title('cos(x)')
% ]* j1 V: M! Y& C8 o' _x=linspace(0,2*pi,30);
y=sin(x);
$ y4 ?8 d( S; v' R, |1 Z4 p1 wplot(x,y,'r');
zoom on
" X6 K0 O6 `8 M* F  B, f" c0 R9 N& Z% ip=[1 -4 9 -10];
4 Y# {* N5 M, y2 t; z4 K- i1 D; ur=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')
r=fzero('x-(cos(x))^2',1)//其中必须输入的是方程对应的函数名
[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
太感谢了

zhula

2# mrx
" b# w+ t) J1 r& L0 L3 K+ V% `: {最近在做有关促销的文章，可以借鉴，３Ｑ

byit

Thanks you~~