Initializing help system before first use

# getnextcol

Purpose
Get the next column in the matrix.
Synopsis
`void *getnextcol(XPRMcontext ctx, void *adr, XPRMmpvar *var, int *col);`
Arguments

ctx | Mosel's execution context
adr | Value returned by the previous call to this function or NULL for the first call
var | A pointer to return the variable reference
col | A pointer to return the column number

Return value
The value to be used as the adr parameter for a subsequent call or NULL when all columns have been enumerated.
Example

    /* Display column names */
    void dispcolnames(XPRMcontext ctx)
    {
     void *ptr;
     XPRMmpvar v;
     int ndx;

     if(mmx->getmatsolv(ctx, NULL, NULL)<3)
     {                                    /* only if a problem exists */
      mmx->genmpnames(ctx, XPRM_KEEPOBJ, NULL, 0);
      ptr=NULL;
      while((ptr=mmx->getnextcol(ctx, ptr, &v, &ndx))!=NULL)
      mm->printf(ctx, "%p=%s\n", v,
                 mmx->getmpname(ctx, XPRM_MPNAM_COL, ndx));
     }
    }

Further information
This function returns the next column information (decision variable reference and column number) in the matrix. The second parameter is used to store the current location in the table: the value returned by the function has to be used as input for the subsequent call until the function returns NULL.
Related topics
getnextrow, getnextsos.
Parent Topic Matrix related functions

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