... <看更多>

This happens because of your max and min values you set. In your f3() function you operate with dnorm() which reaches 0 very quickly once ... ... <看更多>

First of all we see from x2+y2=9 that y lives in Jy=[−3,3]. Fix y in Jy=[−3,3]. Then x lives in the interval Jx(y)=[ −√9−y2, +√9−y2 ]. ... <看更多>