Matlab 提取多元多项式

这下通了,都是小问题：x1=[100101.9108.2104.01102.6103.6];x2=[174162.6233.8257322.4373.1];y=[88.9283.791.13127.2

x1=[10198.498.898.598.698.298.899.299.5100.6101.9101.5102.7102.4102.8103.1102.9103.3103.5103.6104.41

p=x1^4+2*x1^3*x2+x1^2*x2^2+3*x1*x2^3-x2^4；a=sym2poly(subs(p,x2,1));x1^2*x2^2的系数b=a(length(a)-2)再问：谢谢

_1.m输入：functiony=zhidao_1(x)y=x(3)*sqrt((x(1)-0)^2+(x(2)-4)^2)+x(4)*sqrt((x(1)-1)^2+(x(2)-5)^2)+x(5)

分析这是一个约束优化问题,可用fmincon求解.参考代码f=@(x)exp(8.864-267.893/abs(x(1)))+exp(11.271-1227.294/x(2))+exp(13.223

x1=[1.51.5222.52.52.52.53333];x2=[0.050.10.150.20.050.10.150.20.050.10.150.2];y=[10.990.980.970.980.

x1=[7.53237.92628.28338.54208.7702]';x2=[117.2117.4117.7118.3118.6]';x3=[2.9503.3005.2706.5257.470]'

clc;clearsymsa5b1b2b3b4b5zf=sym('-a5*b1*z^16+a5*b4*z^2*b3*b2*b1-a5*b3*z^12*b1-a5*b3*z^20*b2+a5*b2*z^

collectCollectcoefficientsSyntaxR=collect(S)R=collect(S,v)DescriptionForeachpolynomialinthearraySofp

怎么x1和x2只有8个元素,而x3和y有10个元素?

data=[];fora=1:19forb=1:a-1forc=1:b-1ford=1:c-1fore=1:d-1ifa+2*b-5*c+8*d-4*e==15data=[data;a,b,c,d,e

可以改变一下初值,这个函数如果初值设置不好,得出的结果可能不对

y=[320320160710320320320160710320];x1=[2.31.71.31.71.71.611.71.71.7];x2=[2.31.71.71.61.71.711.71.71.

y=[320320160710320320320160710320];x1=[2.31.71.31.71.71.611.71.71.7];x2=[2.31.71.71.61.71.711.71.71.

symsxf=3*x^5+2*x^2;A=sym2poly(f)这样的?

s=solve('c1=0','c2=0','c3=0','a1','a2','a3');改为s=solve(c1,c2,c3,'a1','a2','a3')

提取X的2到8行的第1列

a=[320320160710320320320];f=[0.180.180.180.180.090.360.18];v=[2.31.71.71.71.71.71];F=[38.829.2326.53

http://hi.baidu.com/zhangkai1201/blog/item/c2bf22039bf73983d53f7c64.html

clc;clearA=zeros(21,21);A(1,[12])=[1-1/2];fori=2:20A(i,[i-1,i,i+1])=[1,-1,1/2];endA(21,[17,21])=[1/2