Question

matlab中怎么用编号来进行一个数组(？)的赋值

syms x1 x2 x3 x4 x5 x6 x7 y dy1 dy2 dy3 dy4 dy5 dy6 dy7;
y=174.42*(x1/x5)*(x3/(x2-x1))^0.85*sqrt((1-2.62*(1-0.36*(x4/x3)^(-0.56))^(3/2)*(x4/x2)^1.16)/(x6*x7));
for i=1:7
dy(i)=inline(char(diff(y,x(i))))
end
像这样用for简化求7个未知数各自对应的偏导数的程序应该怎么写啊
主要问题就在for循环里用i编号那里，该怎么写才能成功运行？？？

Answer 1

syms x1 x2 x3 x4 x5 x6 x7 dy1 dy2 dy3 dy4 dy5 dy6 dy7;
x = sym([x1,x2,x3,x4,x5,x6,x7]);
dy = sym([dy1,dy2,dy3,dy4,dy5,dy6,dy7]);
y = 174.42*(x1/x5)*(x3/(x2-x1))^0.85* ...
    sqrt((1-2.62*(1-0.36*(x4/x3)^(-0.56))^(3/2)*(x4/x2)^1.16) ...
    /(x6*x7));
for i = 1:7
    dy(i) = inline(char(diff(y,x(i))));
end