图都画出来了,还怕找不到极值点:-) 最简单的办法是直接从图上找,精度绝对够了
clear all;
clc;close all;
h= ezplot('-19.313+295.27*6.09*42.1*x/1000-165.44*(6.09*42.1*x/1000)^2+40.874*(6.09*42.1*x/1000)^3-3.8445*(6.09*42.1*x/1000)^4-y*0.074/6.09',[1,100,1,20000]);
hold on;
y=get(h,'YData'); %获得y数据
x=get(h,'XData'); %获得x数据
[peak_y,i]=findpeaks(y);%找极值
peak_x=x(i); % 极值点 x
plot(peak_x,peak_y,'r*');
grid on;
peak_y =
1.4397e+004
peak_x =
8.1566
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