get_col_name, get_origcol_name

Gets the name of a column in the lp.

char *get_col_name(lprec *lp, int column);

char *get_origcol_name(lprec *lp, int column);

Return Value

get_col_name and get_origcol_name return the name of the specified column. A return value of NULL indicates an error. The difference between get_col_name and get_origcol_name is only visible when a presolve (set_presolve) was done. Presolve can result in deletion of columns in the model. In get_col_name, column specifies the column number after presolve was done. In get_origcol_name, column specifies the column number before presolve was done, ie the original column number. If presolve is not active then both functions are equal.

Parameters

Pointer to previously created lp model. See return value of make_lp, copy_lp, read_lp, read_LP, read_mps, read_freemps, read_MPS, read_freeMPS, read_XLI

column

The column for which the name must be retrieved. Must be between 1 and the number of columns in the lp. In get_col_name, column specifies the column number after presolve was done. In get_origcol_name, column specifies the column number before presolve was done, ie the original column number.

Remarks

The get_col_name and get_origcol_name functions return the name of the column.
Column names are optional. If no column name was specified, the function returns Cx with x the column number.

Example

#include <stdio.h>
#include <stdlib.h>
#include "lp_lib.h"

int main(void)
{
  lprec *lp;
  char *name;

  /* Create a new LP model */
  lp = make_lp(0, 1);
  if(lp == NULL) {
    fprintf(stderr, "Unable to create new LP model\n");
    return(1);
  }

  name = get_col_name(lp, 1); /* will be C1 since no column name was set */

  delete_lp(lp);
  return(0);
}

lp_solve API reference