Yahoo奇摩 網頁搜尋

local maximum或是local minimum一定發生在 critical point 。 但 critical point 不一定會是local maximum或是local minimum。 例如f(x)=x3...

...: 3x(x+2) = 0 --> x = 0, -2 3y(y-2) = 0 --> y = 0, 2 four critical points: (0, 0) saddle point (0, 2) local minimum (-2, 0) local maximum (-2, 2) saddle...

...真 根據目前的樣本資料 ，做出拒絕H0的決策時，會犯的型一誤差機率 critical value是自訂的決策準則，也就是自己訂一個標準 用來拒絕H0，像你定...

...2 - 2x + 4y + 1 Fx= 2x- 2 =0 =>x=1 Fy= -2y+4 =0 => y= 2 => critical point 只有一個點(x,y)=(1,2) Fxx= 2, Fxy=0, Fyy= -2 | ...

f(x,y) = (x+y)e^{1-x^2-y^2} 對 x 偏微分, 就是把 y 看成是常數, 所以 f_x(x,y) = e^{1-x^2-y^2} + (x+y)e^{1-x^2-y^2}(-2x) = [1-2x(x+y)]e^{1-x^2-y^2} 對 y 偏微, 是把 x 看成是常數, 因此 f_y(x,y) = e^{1-x^2-y^2} + (x+y)e^{1-x^2-y^2}(-2y) = [1-2y(x+y)]e^{1-x^2-y^2} 臨界點, 在函數處處可微的情況如本例, 就是 f_x(x,y)=0=f_y(x,y) 而由於 e...

Find critical points and test for relative extrema.List the critical ...

1. First find its critical points where f_x=0 and f_y=0. i.e 2xy-2y=0 and x^2-2x-3+2y=0 =>... D(x,y)=(f_xx)(f_yy)-(f_xy)^2=4y-(2x-2)^2, evaluate D at critical points => D(3,0)=-1<0 so (3,0,f(3,0)) is...

...; 27 a =0.01 先假設標準差=σ，抽樣數=n (1)以Xbar為test statistic 其 critical value為多少? Z(0.01)=2.32critical value=27-2.32*σ/√ n (2)以t當作test sttisitc...