Originally posted by: guvenc

Hello people I dont know if it s right forum to ask this question but here is my problem. Thanks for your helps..
I have a thread in OPL using Cplex forum about this issue but the forum is under maintenance now and I am a bit stuck with this problem for five days.
In short I try to read data(problem instance) from a notepad file then solve a math model with the instance, give an output file and then read another input notepad file to solve again and again...
Below I have an(uncompleted) main script in which I want to read data from different .txt files consequtevly. The notepad files are named like those examples.
n20r1p1w1c1pr01.txt
n20r1p1w1c1pr02.txt
n50r1p1w1c1pr10.txt

20
1 80 85 5 60
2 122 127 5 50
....
19 189 198 9 40
20 124 132 8 40
Above is shown one of my notepad file.

In main; I try to assign the information inside the files to r,d,w and c in each iteration. I'll use those arrays in my math model.
I get an error when I write such lines in order to be able to itterate among notepad files.
*// var h6=new Array();
*// h6[0]='01';
*// h6[1]='02';
....
*// file.open("n"h1"r"h2"p"h3"w"h4"c"h5"pr"h6[0]".txt")//in each iteration I ll play with index of h
Internal error: ASSERTION FAILED at ..\..\..\src\script\extras.cpp:849

In this wy i expect to iterate among notepad files. h6[1]='02' h6[2]='03'
main
{
// r,d,w,c will be used as parameters in mathematical model
var r=new Array();
var d=new Array();
var w=new Array();
var c=new Array();

var index=1;
var file= new IloOplInputFile();
// HERE is Notepad File Names Logic
var h1='20';//20 50 100 500
var h2='1';
var h3='1';
var h4='1';//1 2 3
var h5='1';//1 2 3 4
var h6='01';//01 02 ... 10

var i=1;
while(i<=2)
{
file.open("n"h1"r"h2"p"h3"w"h4"c"h5"pr"h6".txt");//This works.
//file.open("n20r1p1w1c1pr01.txt");
var read;
var tmp;
if (file.isOpen)
{
writeln("f is open");
while (!file.eof)
{
read=file.readline();//reads line by line
writeln(read);
tmp=read.split("\t");
if(tmp[1]!=null)
{
rindex=tmp[1];
dindex=tmp[2];
windex=tmp[3];
cindex=tmp[4];
writeln(rindex,"-",dindex,"-",windex,"-",cindex);
index=index+1;
}
}
file.close();
}
else
{
writeln("f is closed");
}
if (file.isOpen)
writeln("f is open");
else
writeln("f is closed");

for(a=1;a<=20;a++)
write(r[a]," ");

h6='02';// I change here.
i=i+1; // This is just to try if i can get second file and it works as expected
}

}
Thanks a lot for your helps.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

You could use something like the following to iterate through the various txt files:

main 
{ var h1 = 

new Array (
"20",
"40",
"60"); var h2 = 
"1"; var h3 = 
"1"; var h4 = 

new Array (
"1", 
"2", 
"3"); var h5 = 

new Array (
"1", 
"2", 
"3"); var h6 = 

new Array (
"01",
"02",
"03"); var index=0; var file= 

new IloOplInputFile(); 

while(index<=2)
{ var fileName = 
"n"+h1[index]+
"r"+h2+
"p"+h3+
"w"+h4[index]+
"c"+h5[index]+
"pr"+h6[index]+
".txt"; writeln(
"File to open: "+ fileName); file.open(fileName); 
// file related operations to store the other arrays file.close(); index++; 
} 
}

This assumes the presence of the following files in the same directory as that of your mod/prj file:

n20r1p1w1c1pr01.txt
n40r1p1w2c2pr02.txt
n60r1p1w3c3pr03.txt

Hope this helps.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: guvenc

Thank you Abhishek, you are always helping me.
Those little errors often bothers newbies untill they get experienced.
At least; I hope this thread helps people like me :)
#CPLEXOptimizers
#DecisionOptimization