# Unexpected results
**URL:** https://discuss.ampl.com/t/unexpected-results/1206
**Category:** Support
**Created:** [September 10, 2024, 1:30am UTC](https://discuss.ampl.com/t/unexpected-results/1206 "2024-09-10T01:30:34Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@jesus\_Mesa](https://discuss.ampl.com/u/jesus_Mesa)
#### Post date: [September 10, 2024, 1:30am UTC](https://discuss.ampl.com/t/unexpected-results/1206/1 "2024-09-10T01:30:35Z")
I have the next model:
#Conjuntos
set PL;
set CD;
set ZC;
set PROD;
set PERIODO;
#parámetros
param WACC \>=0;
param PRICE {PROD,ZC,PERIODO}\>=0;
param PRCOST {PROD,PL,PERIODO}\>=0;
param FLTPCD {PROD,PL,CD,PERIODO} \>=0;
param FLTCDZC {PROD,CD,ZC,PERIODO} \>=0;
param OPCOSTP {PL,PERIODO} \>=0;
param OPCOSTCD {CD,PERIODO} \>=0;
param TD\>=0;
param INVP {PL,PERIODO}\>=0;
param INVCD {CD,PERIODO}\>=0;
param TAX {PERIODO}\>=0;
param DEMANDA {PROD,ZC,PERIODO}\>=0;
param CAPP {PL} \>=0;
param CAPCD {CD} \>=0;
param tasa{PERIODO}\>=0;
#variables
var ingresos {t in PERIODO} \>=0;
var totalcost {t in PERIODO} \>=0;
var depreciacion {t in PERIODO}\>=0;
var prcost {t in PERIODO}\>=0;
var trcost {t in PERIODO} \>=0;
var opcost {t in PERIODO}\>=0;
var ppe {t in PERIODO}\>=0;
var fai {t in PERIODO}\>=0;
var pcdflow {p in PROD, i in PL, j in CD, t in PERIODO} \>=0;
var cdzcflow {p in PROD, j in CD, k in ZC, t in PERIODO}\>=0;
var w {i in PL, t in PERIODO} binary;
var x {j in CD, t in PERIODO} binary;
var UtilOperat \>=0;
var Utiliddw{t in PERIODO} \>= 0;
#función objetivo
maximize Descontado:
sum{t in PERIODO}((ingresos[t]-totalcost[t])/tasa[t]);
subject to calculo\_ingresos {t in PERIODO}:
ingresos[t] = sum{p in PROD, j in CD, k in ZC}cdzcflow[p,j,k,t]\*PRICE[p,k,t];
subject to utilidad\_operativa:
UtilOperat = sum{t in PERIODO}(ingresos[t]-totalcost[t]);
#################################################
subject to calculomes {t in PERIODO}:
Utiliddw[t] = (ingresos[t]-totalcost[t]);
###################################################
subject to calculo\_prcost {t in PERIODO}:
prcost[t] = sum {p in PROD, i in PL, j in CD} pcdflow[p,i,j,t]\*PRCOST[p,i,t];
subject to calculo\_trcost{t in PERIODO}:
trcost[t] = sum {p in PROD, i in PL, j in CD}(pcdflow[p,i,j,t]\*FLTPCD[p,i,j,t]) + sum{p in PROD, j in CD, k in ZC}(cdzcflow[p,j,k,t]\*FLTCDZC[p,j,k,t]);
subject to calculo\_opcost{t in PERIODO}:
opcost[t] = sum {i in PL} (OPCOSTP[i,t]\*w[i,t]) + sum {j in CD}(OPCOSTCD[j,t]\*x[j,t]);
subject to calculo\_totalcost {t in PERIODO}:
totalcost[t] = opcost[t] + trcost [t]+ prcost[t];
subject to depreciacion\_ini:
depreciacion[1]=0;
subject to calculo\_depreciacion {t in PERIODO: t\>1 }:
depreciacion[t] = ppe[t-1]\*TD;
subject to ppe\_ini:
ppe[1]=fai[1];
subject to calculo\_ppe {t in PERIODO: t\>1}:
ppe[t] = ppe[t-1] + fai[t];
subject to fai\_ini:
fai[1]= sum {i in PL}(INVP[i,1]\*w[i,1]) + sum{j in CD} (INVCD[j,1]\*x[j,1]);
subject to calculo\_fai { t in PERIODO: t\>1}:
fai[t]= sum {i in PL}( INVP[i,t]_(w[i,t]-w[i,t-1]) ) + sum{j in CD} ( INVCD[j,t]_(x[j,t]-x[j,t-1]) );
subject to cappl {i in PL, t in PERIODO}:
sum {p in PROD, j in CD} pcdflow [p,i,j,t] \<= CAPP[i]\*w[i,t];
subject to capcd {j in CD, t in PERIODO}:
sum {p in PROD, i in PL} pcdflow [p,i,j,t] \<= CAPCD[j]\*x[j,t];
subject to demanda {p in PROD, k in ZC, t in PERIODO}:
sum {j in CD} cdzcflow[p,j,k,t] = DEMANDA[p,k,t];
subject to balance {p in PROD,j in CD, t in PERIODO}:
sum { i in PL} pcdflow[p,i,j,t] = sum { k in ZC} cdzcflow[p,j,k,t];
subject to cd\_abierta {j in CD, t in PERIODO: t\>1}:#si el CD abre se mantiene abierto
x[j,t-1] \<= x[j,t];
subject to pl\_abierta {i in PL, t in PERIODO: t\>1}:#Si la planta abre se mantiene abierta
w[i,t-1] \<= w[i,t];
#subject to num\_bodegas {t in PERIODO}:
#sum {j in CD} x[j,t] = 2;
When I print the results the following appears:
ingresos [\*] :=
1 1000000000.0
2 1000000000.0
3 2000000000.0
;
totalcost [\*] :=
1 1000000000.0
2 1000000000.0
3 1000000000.0
;
Utiliddw [\*] :=
1 200000000.0
2 200000000.0
3 200000000.0
;
Why does Utiliddw show a value of 200000000.0 when it should show the result of 1000000000.0-1000000000.0 = 0. I greatly appreciate any help you can give me.
---
### Author:  [@4er](https://discuss.ampl.com/u/4er)
#### Post date: [September 10, 2024, 10:31pm UTC](https://discuss.ampl.com/t/unexpected-results/1206/2 "2024-09-10T22:31:20Z")
Given only the model, it is hard to know. Can you give some more information?
1. Display the values instead with these commands, and paste the result into your reply:
```auto
option display_precision 0;
option display_round '';
display ingresos, totalcost, Utiliddw;
```
1. Copy all of the output from the solver, and paste it into your reply.
2. If possible, provide the data for your problem. (You can upload a file of data by using the “upload” icon at the top of the Discourse editor window.)
---
### Author:  [@jesus\_Mesa](https://discuss.ampl.com/u/jesus_Mesa)
#### Post date: [September 10, 2024, 10:48pm UTC](https://discuss.ampl.com/t/unexpected-results/1206/3 "2024-09-10T22:48:38Z")
I appreciate your response. This morning, I couldn’t believe it when I found out it was a typographical error in `option display_precision 0;`, which I had written as `option display_precision 1`, and the calculations sent by the solver only contained one significant figure. By setting it to ‘0’, the problem was solved.
Once again, thank you very much, and I apologize for my rookie mistake.