Originally posted by: MariusGi

Hello, I have a problem. I want to fill the IloNumArray with data from file. Would appreciate your help.
----------
ifstream is;
.......
---------- 
double qq,t;
int m=30;

Although if I use a matrix it works.

---------

int l=20,n=20;

 }  

Are you trying to read all the date into a single numeric vector (one dimension), or into a two- or three-dimensional array?

Originally posted by: MariusGi

Yes I want to read it to a single numeric vector (one dimension).

It is still unclear to me what exactly you want to achieve. Read everything into q?

In any case, there is an overload for operator>> that reads from std::istream into IloNumArray. Assume that file arrayinput.txt contains this

[  1.0, 2.0, 3.0 ]

Then this code

#include <fstream>
#include <iostream>
#include <ilcplex/ilocplex.h>

int
main(void)
{
   IloEnv env;
   IloNumArray a(env);
   std::ifstream is("arrayinput.txt");

   is >> a;
   for (IloInt i = 0; i < a.getSize(); ++i)
      std::cout << a[i] << std::endl;

   env.end();
   return 0;
}

prints

1
2
3

So if you can write your data file like the one above, then input of an array is very simple. Otherwise something like this can do the trick:

IloNumArray q(env);
for (int i = 0; i < m; ++i) {
   double qq;
   is >> qq;
   q.add(qq);
}

Originally posted by: MariusGi

Thank you !
That's what I wanted.
How about for two dimension vector(matrix) ? This is my code for it but its incorrect since every element is a vector here and I cannot do arithmetic operations with it.

int l=20,n=20;

 }  

Please take a look at the examples/src/cpp/facility.cpp example and its corresponding examples/data/facility.dat data file. The example reads two vectors and a matrix from that file. From the example it should be pretty clear how to handle input into vectors and matrices.

Originally posted by: MariusGi

Seems I created a matrix with one row. Still don't know how to create with n rows

typedef IloArray<IloNumArray> NumMatrix;

What is 'w' and how does your input file look like? In general, if you want to create a matrix row-by-row then you do it like this:

NumMatrix W(env);
for (int i = 0; i < rows; ++i) {
   IloNumArray row(env);
   // Set/read values for for row
   ...
   W.add(row);
}

Originally posted by: MariusGi

My w is 
double w; 
my input file is .txt with data for vectors and matrixes. I will attach that file.
I want this to be a 20x30 matrix (first matrix in file). Seems I did it right. Thanx again for the help !