linprog上的參數

Question

任何人都可以解釋參數邊界如何實際工作。我正在閱讀文檔，但我無法理解它。 https://docs.scipy.org/doc/scipy/reference/optimize.linprog-simplex.html

Answer 1

我不確定你要求什麼，因爲文檔完全描述了它。但這裏是一些例子：

from scipy.optimize import linprog 
c = [-1, 4] 
A = [[-3, 1], [1, 2]] 
b = [6, 4] 

沒有明確的界限： 默認行爲;同樣對於顯式的邊界的每個變量

res = linprog(c, A, b) 
# Default: lower-bound of each variable is 0, upper-bound is +inf 

對： 一個綁定定義所有變量

對

x0_bnds = (-3, 5) 
res = linprog(c, A, b, bounds=x0_bnds) 
# lower-bound of each -3, upper-bound 5 

x1_bnds = (-3, None) 
res = linprog(c, A, b, bounds=x1_bnds) 
# lower-bound of each -3, upper-bound +inf 

x2_bnds = (-np.inf, None) 
res = linprog(c, A, b, bounds=x2_bnds) 
# lower-bound of each -inf, upper-bound +inf 

序列清楚地表達邊界： 一個綁定定義爲每個變量

x0_bnds = (None, None) 
x1_bnds = (-3, None) 
res = linprog(c, A, b, bounds=(x0_bnds, x1_bnds)) 
# x0 between 0 and +inf 
# x1 between -3, +inf 
# len(bounds) = len((x0_bnds, x1_bnds)) needs to be equal to number of vars