§5.1 单纯形表显示命令 TABL (Table)
1.命令功能:显示当前单纯形表。
2.命令格式:
:TABL<CR>
3.命令使用:在线性规划模型的迭代过程中,如果使用了TABL命令,则屏幕上显示出当前有单纯形表。因此,PIV命令和TABL命令交替使用,可以一步一步地完成并观看到单纯形的算法过程,这对于了解基的变化情况很有用。下面将第一章已用GO命令求出结果的模型用PIV命令和TABL命令重新举例如下:
:LOOKALL
MAX2X1+3X2 SUBJECTTO 2) X1+2X2<=12
3) 2X1+4X2<=18
END
:TABL
THETABLEAU
ROW(BASIS) X1 X2
1 ART -2.000 -3.000 .000 .000 .000
2 SLACK 1.000 2.000 1.000 .000 12.000
3 SLACK 2.000 4.000 .000 1.000 18.000
:PIV
X2ENTERS AT VALUE 4.5000 IN ROW3 OBJ. VALUE = 13.500 :TABL
THETABLEAU ROW (BASIS) X1 X2 1 ART -.500 .000 .000 .750 13.500
2 SLACK .000 .0001 .000 -.500 3.000
3 X2 .500 1.000 .000 .250 4.500
:PIV
X1ENTERS AT VALUE 9.0000 IN ROW3 OBJ. VALUE = 18.000
:TABL
THETABLEAU ROW (BASIS) X1 X2 1 ART .000 1.000 .000 1.000 18.000
2 SLACK .000 .000 1.000 -.500 3.000
3 X1 1.000 2.000 .000 .500 9.000
:PIV
LPOPTIMUM FOUND AT STEP 2
OBJECTIVE FUNCTION VALUE
1)18.0000000
VARIABLE VALUE REDUCEDCOST X1 9.000000 .000000 X2 .000000 1.000000
ROW SLACK DUAL PRICES 2) 3.000000 .000000 3) .000000 1.000000
NO.ITERATIONS=2
DORANGE(SENSITIVITY) ANALYSIS ? PIV>N
:TABL
THE TABLEAU
ROW (BASIS) X1 X2 1 ART .000 1.000 .000 1.000 18.000 2 SLACK .000 .000 1.000 -.500 3.000 3 X1 1.000 2.000 .000 .500 9.000 :
|