lingo的@if函數(shù)用法請教
我的LINGO程式碼在@if的地方卡住了,之前@FOR函數(shù)承蒙不知明的大大指導(dǎo),感激不盡,希望這次可以有大大可以幫我解答一下,萬分感激,以下是程式碼的部份
SETS:
SET/1..2/:PT_i,TiJ,LT_i,HC_i,X_i;
ENDSETS
DATA:
D=30; mean deman/day;
SD=3; Std.Dev./day;
PT_i=4,8; Nodei...J average production time/day;
TiJ=0,5; Nodei...J average transportation time/day;
HC_i=2,4; Nodei...J average holding cost/day;
Z=1.65; Safety Factor;
P=10; Nodei...J average penalty cost/day;
Due=12;
ENDDATA
The objective Guaranteed Serviced Tiem;
MIN=seq1+seq2+seq3;
seq1=Z*HC_i(1)*SD*(LT_i(1)-X_i(1))^.5;
seq2=Z*HC_i(2)*SD*(LT_i(2)-X_i(2))^.5;
seq3=P*@if((X_i(2)-Due>0),(X_i(2)-Due),0));
這部份我寫不太出來,我希望當(dāng)X_i(2)-Due>0時(shí)就以X_i(2)-Due的值運(yùn)算
若X_i(2)-Due==(X_i(1)+TiJ(2))+PT_i(2);
@FOR(SET:LT_i(1)=PT_i(1));
@FOR(SET:LT_i(1)>=X_i(1));
@FOR(SET:LT_i(2)>=X_i(2));
@FOR(SET:@GIN(X_i));
END
感謝大大的快速回應(yīng),但是我執(zhí)行程式后,lingo告訴我在最后END的地方有錯(cuò),Missing right parenthesis,可以請大大再幫我看看嗎?真的很感謝您