Question

matlab里面怎样求二元符号函数的极小值？

比如y=a*x1^2+b*x2^2 谢谢

Answer 1

计算偏导差神，然后取虚郑亏零值，可以通过二阶导丛碧来判断极值性质。% 比如y=a*x1^2+b*x2^2 谢谢 % By lyqmath
clc; clear all; close all;
syms a b x1 x2
y = a*x1^2 + b*x2^2;
dy1 = diff(y, x1);
dy2 = diff(y, x2);
xt1 = solve(dy1, x1)
xt2 = solve(dy1, x2)

Answer 2

http://oldweb.cqvip.com/qk/98258X/200306/9075634.html

注册用户 可在线阅读；斗旁下旁孝载要掏钱
在线阅读下载全文收藏本运销稿文

Answer 3

计算丛碧偏导，然后取零值，可以通过二阶导来判断极值性质。虚郑亏% matlab里面怎样求二元符号差神函数的极小值？
% 比如y=a*x1^2+b*x2^2 谢谢 % By lyqmath
clc; clear all; close all;
syms a b x1 x2
y = a*x1^2 + b*x2^2;
dy1 = diff(y, x1);
dy2 = diff(y, x2);
xt1 = solve(dy1, x1)
xt2 = solve(dy1, x2)