Search found 9 matches

by ZNSen
2 years ago
Forum: Syntax
Topic: condition that involves variable (use $ or not)
Replies: 1
Views: 852

Re: condition that involves variable (use $ or not)

Problem successfully solved. In case someone else have the same problem, the solution is in this document (see link) pp: 37-40
[url][/http://pdf.usaid.gov/pdf_docs/pnacj887.pdf]
Cheers
Zinsou
by ZNSen
2 years ago
Forum: Syntax
Topic: condition that involves variable (use $ or not)
Replies: 1
Views: 852

condition that involves variable (use $ or not)

Hi dear all, I write the following in which Price is a variable. The model solves but doe not take the condition in to account.Is there any way I can use the $ if the condition is related to a variable? If not, is there any other way I can proceed? Thanks q_ginstock2(Yr,i) $ (PRICE.l(Yr,i) < pmin(i)...
by ZNSen
2 years ago
Forum: Syntax
Topic: implement conditions related to variables in a model
Replies: 1
Views: 721

Re: implement conditions related to variables in a model

Just to tell you that I´ve already included all the parameters and variables already. All I need now is to include these 2 conditions:

if P(i,t) > Ps(i) ➔ Gn(i,t) ≤ 0
if P(i,t) < Pr(i) ➔ Gn(i,t) ≥ 0

Help, please!
by ZNSen
2 years ago
Forum: Syntax
Topic: implement conditions related to variables in a model
Replies: 1
Views: 721

implement conditions related to variables in a model

Hello dear all, I am back a new challenge I´m facing now. I want to add a buffer stock scheme to a partial equilibrium model I have built. My problem is that I have no clue about how to implement the conditions that must be fulfilled, especially where and how to write these conditions to run the mod...
by ZNSen
2 years ago
Forum: Syntax
Topic: Execute, load excel file and read parameters´value
Replies: 1
Views: 900

Execute, load excel file and read parameters´value

Hi dear all, I want to read an excel sheet in GAMS. the file contains series of 500 values per year for each variable a,b and c. it is a parameter that I define as Stk(yr,i,se). The values are saved in an excel sheet with 3 dimensions Rdim=2 Cdim=1 like the following example 1 2 3 ...500 a y1 a y2 ....
by ZNSen
2 years ago
Forum: Syntax
Topic: unable to read and write Excel spreadsheet data in GAMS
Replies: 3
Views: 1053

unable to read and write Excel spreadsheet data in GAMS

Hi dear all, I am trying to read an excel sheet in GAMS and create a GDX file from it. But I recieve these error messages : **** GDX ERROR AT LINE 87 - Open read failed C:\Users\hohn\Documents\gamsdir\projdir\Randomdata.gdx **** GDX ERROR AT LINE 87 - Msg: No such file or directory Here is the lines...
by ZNSen
2 years ago
Forum: Modeling
Topic: How to build a recursive dynamic model
Replies: 2
Views: 1290

Re: How to build a recursive dynamic model

Many thanks. I successfully solved the problem
by ZNSen
2 years ago
Forum: Modeling
Topic: How to build a recursive dynamic model
Replies: 2
Views: 1290

How to build a recursive dynamic model

Hi dear all, I am writing a dynamic model but it is quite challenging for me since I´m a biginner in modelling. My objective is to build a dynamic Partial Equilibrium model to assess the implementation of some policies on agricultural commodity market. I have started with a simple model with a time ...