Hello

I m writing a simple farm profit maximization model. I wrote the simple form and I got the answer which means that the model works, but when I used set notation to define variables I got many Syntax errors. Below is the model. would you please help me? I cannot understand where is the problem.

option sysout=off;

sets

i “option” /p,b,s,d/

j “products” /c,l,m/

k “type of product” /1,2,3,4,5,6,7,8,9,10,11,12,13,14/;

Alias (i,ii,iii)

variables

z total farm profit

x(i,j,k) amount of produced bought sold or distributed of each type of crop livestock or manure;

parameters

y(k) profit of each crop type/

“1” 937.45

“2” 9712.7

“3” 1011.43

“4” 10156.57

“5” 1085.41

“6” 10600.44

“7” 1140.89

“8” 10933.34

“9” 1002.13

“10” 118.03

“11” 484.42

“12” 365.39

“13” 532.91

“14” 0

/

equations

OBJ

land1

land2

machin1

machin2

machin3

machin4

livestock1

livestock2

feeding1

feeding2

feeding3

feeding4

rotation1

rotation2

rotation3

rotation4

rotation5

disposal1

disposal2

disposal3

spreading1

spreading2

spreading3;

OBJ…z=E= sum(k, x(p,c,k)* y(k)) + 1849*x(p,l,1)+ 53854*x(p,l,2)- 258.5*x(b,c,1) - 258.5*x(b,c,2) - 205.7*x(b,c,9) +15.70*x(s,m,3) -3.374*x(d,m,1) - 6.90*x(d,m,2);

land1… sum(k$ x(p,c,k) lt14 ,x(p,c,k))=L=400;

land2… x(p,c,14)=L=23;

.

.

.

the errors show problem with the firm line of OBJ function!!

Thank you so much