Originally posted by: iturkmen

Hi,
I am using C programming. I have decision variables like y(i,j,k,t). I solved my problem and assume that my solution looks like this:
y(1,1,6,185) = 0.196002
y(1,1,9,3047) = 0.242096
y(1,1,10,2761) = 0.334921
y(1,1,11,2951) = 0.226982
y(1,5,10,2601) = 0.196002
y(1,6,7,636) = 0.196002
y(1,7,8,1228) = 0.196002

I wrote these variables to the *.txt file with this code:
for (i1 = 0; i1 < numDecVars; i1++) {
if (x_solni1 > 0) {
fprintf(dec_var_name_file, " %s = %lf \n", decVarNamei1, x_solni1);
}
}

I need to add these variables to my original problem as additional constraints. However I couldn't find a way to read the file with parentheses. Is there any way to write the decision variables without parenthesis? or Is there any way to create c code for ignore the parentheses?

Thanks.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

How did you try to read the txt file? Could you show us the code that failed and tell us what exactly failed? I don't see why the parentheses should cause any trouble when reading the file.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: iturkmen

Hi,
My code includes these :

strcat(infile, "/mydata.txt");
sscanf(Line, "%s %d,%d,%d,%d %s %lf",&Y1, &V1, &I1, &J1, &T1, &N2,&Val);

It doesn't work because I don't know how to code this situation.

My decision variables are listed below.
y(1,1,6,185) = 0.196002
y(1,1,9,3047) = 0.242096
y(1,1,10,2761) = 0.334921

I 'd like to have a matrix or arrays like this, I am not sure that I can do this.

M=[1, y, 1, 1, 6, 185, 0.196002 ;
2, y, 1, 1, 9, 3047, 0.242096;
3, y, 1, 1 ,10, 2761, 0.334921]
Actually I want to store string y as a decision variable name,and i,j,k,t as indices and decision variable value. When I store these data in arrays, I will rank them according to the decision variable values. Lastly, I will add the highest decision variable as additional constraint to my original model.

Thanks for your help.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

Still not sure I understand correctly. Is your problem to read/parse a text file in C?
A file with this content

y(1,1,6,185) = 0.196002 y(1,1,9,3047) = 0.242096 y(1,1,10,2761) = 0.334921

can be parsed by the following code snippet

#include <stdio.h> #include <string.h>   

int main(

void) 
{ FILE *f; 

char y; 

int i, j, k, l; 

double val; 

char line[1024]; 
/* Assume no line is longer than 1024 characters. */   

if ( (f = fopen(
"mydata.txt", 
"r")) == NULL ) 
{ perror(
"fopen"); 

return -1; 
}   

while (fgets(line, sizeof(line), f) != NULL) 
{ 

if (sscanf(line, 
"%c(%d,%d,%d,%d) = %lf\n", &y, &i, &j, &k, &l, &val) == 6) 
{ printf(
"%c[%d][%d][%d][%d] = %f\n", y, i, j, k, l, val); 
} 
}   fclose(f);   

return 0; 
}

#CPLEXOptimizers
#DecisionOptimization