Hi every body

I have a problem filtering time index in summation . in my model i have time index ( t ) which is defined as a set , in one equation i want to filter the domain of time index , actually in my summation i want to do the summation over a part of set t (not the whole set

: for example i want my summation to be done over time index t but just for

[t-p(i,l)+1,t]

where p(i,l) is a parameter , i wrote it this way but it doesnt look to be correct ,here is part of my code

sets

/ t index of time /1,hl

/activity /a1*a4
(alias(activity,i,j
/m index of staffs /1*8

/l index of projects /1,2

parameters

/h(l) due date of projects /1 8,2 5

table

p(i,l) duration of activities

2 1

a1 2 3

a2 5 4

a3 3 2

; a4 3

variables

(integer variable x(i,m,l,t

co4(m,l) …sum((i,t)$(t>=(t-p(i,l)+1)),x(i,m,l,t))=l=1

## If any body can help me please it would be appreciated

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