[A, B, C, D] = ndgrid (1:10, 5:5:50 0.1:0.1:1 3:3:30);
y = x *。^ 3 + B。* x。^ 2 + C。* x + D;
[如矿坑的,minidx] = min (y (:));
[maxy, maxidx] = max (y (:));
parms_at_min = [(minidx);B (minidx);C (minidx);D (minidx)];
parms_at_max = [(maxidx);B (maxidx);C (maxidx);D (maxidx)];
如果您有多个X值
numx =长度(x);
[A, B, C, D, X) = ndgrid (1:10, 5:5:50 0.1:0.1:1 3:3:30 X);
y = X *。^ 3 + B。* X。^ 2 + C。* X + D;
rsy =重塑(y, [], numx);
[如矿坑的,minidx] = min (rsy);%第一个维度
[maxy, maxidx] = max (rsy);%第一个维度
parms_at_min = [(minidx);B (minidx);C (minidx);D (minidx)];
parms_at_max = [(maxidx)、B (maxidx), C (maxidx)、D (maxidx)];
我没有声称,这是最有效的方式。
