matlab编程

E304731541

d=sym(3*x^3-2*x+1);
) K# p6 t/ N6 D+ H% kdiff(d,2)
7 ?2 V- k- k( x8 ~; @+ \$ P: \$ Dezplot('cos(x)',[0,pi])//4.2
ezplot('(cos(t))^3','(sin(t))^3',[0,2*pi])//4.3
: ?$ }6 `6 z, Mezplot('exp(x)+sin(x*y)',[-2,0.5,0,2])//4.4
fminbnd('x+3*(x^2+cos(x))',-1,1)  //直接求
2 p+ {4 _( c/ ^* \1 D f=sym('x+3*(x^2+cos(x))');//由导数为零来求解
  ff=solve(diff(f));
7 X6 a& j4 M9 ^: a+ ]/ u0 M. y. `; bsubs(f,x,ff),subs(f,x,-1),subs(f,x,-1)
syms x;
int(1/sin(x)^2*cos(x)^2)
syms x z;
5 u, {) H' U* F3 j3 h: _int(x/(1+z^2),x)
6 K2 @! v7 \/ A6 s2 p6 N4 QA=[1,2,3;4,5,6;7,8,9;10,11,12]
A =
, k: k4 w, l5 d* A     1     2     3
; o+ P/ g- d  ~5 s     4     5     6
& a  s* @- u# D" i" E     7     8     9
* f0 m" _/ }$ d    10    11    12
B=[0,1,1;2,2,1;1,1,1];
8 d& P# a; `8 r$ W4 A! kA*B
A^3//错误，矩阵的幂必须矩阵的行列相同才行
. [) q' K1 `3 f3 ^5 Lrref(A)
x=linspace(0,2*pi,30);
y=sin(x);
+ M, r; {4 P1 X* ]2 Yz=cos(x);
plot(x,y,'r',x,z,'pg')
+ ~" d1 T$ _! K5 tx=linspace(0,2*pi,30);
9 x$ N! S% R" q$ a7 h+ w% j* l6 l0 Zy=sin(x);
- o, n* A9 |* @, S3 W) c4 pz=cos(x);
xlabel('自变量x')
) X$ B+ S. I( S8 g5 d/ vylabel('函数y')
5 i; d5 R% \5 E, m! [# xtitle('示意图')
2 _9 \' c" z* ?6 \6 \: v" pplot(x,y,'r',x,z,'pg'),grid on;
% o0 |8 X( q3 s" Qx=linspace(0,2*pi,30);
y=sin(x);
z=cos(x);
plot(x,z,'pg');
& f8 R0 t9 s' y; F8 ]2 ?' ~hold on;
' o( B) |( \. Uplot(x,y,'r')
" J) b: ?- W) s$ ~& ^5 ox=linspace(0,2*pi,100);
y=sin(x);
" r8 [4 ^$ Q5 E1 x7 Qz=cos(x);
plot(x,y);
# x7 K3 ]7 ~1 Q/ n, ~3 otitle('sin(x)')
" l' q9 N' r) D; @9 }! x' \pause;
figure(2);
plot(x,z,'pg');
title('cos(x)')
+ \" _$ W$ B! Ex=linspace(0,2*pi,30);
0 S- r. q' W5 my=sin(x);
plot(x,y,'r');
zoom on
9 v  e) s: \; H: q4 v. n8 }) _8 Dp=[1 -4 9 -10];
/ O" U8 R/ e7 ^: f' g3 ~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。
r=solve('x^3-4*x^2+9*x-10=0')//简单方法
  o! `: e. n7 {r=solve('x^2-a*x-4*b=0','x')
! B2 |, A# g; e6 [: r* q: A, Ld=solve('p*sin(x)-r','x')
+ `' R% d8 j# p; ^! N3 b; \5 F( Nr=fzero('x-(cos(x))^2',1)//其中必须输入的是方程对应的函数名
2 y4 x6 ~1 ]: @0 u  g[x,y]=solve('x+y=1','x-11*y=5','x','y')

mrx

matlab 里的主成分分析.rar (864 Bytes, 下载次数: 4)

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qingqing20072

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qingqing20072

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qingqing20072

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xxj198712

hahahahahahhaaaaaaaaaaaa

zhula

2# mrx
6 M! Z$ j% B$ P6 B7 O! P谢谢啊！！

zhula

2# mrx
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~~