CPXXcopyctype and CPXcopyctype
The routine CPXXcopyctype/CPXcopyctype can be used to copy variable type
information into a given problem.
int CPXXcopyctype( CPXCENVptr env, CPXLPptr lp, char const * xctype )
int CPXcopyctype( CPXCENVptr env, CPXLPptr lp, char const * xctype )
Description
The routine CPXXcopyctype/CPXcopyctype can be used to copy variable type
information into a given problem. Variable types specify whether a variable
is continuous, integer, binary, semi-continuous, or semi-integer.
Adding xctype information automatically changes the problem
type from continuous to mixed integer
(from CPXPROB_LP to CPXPROB_MILP,
from CPXPROB_QP to CPXPROB_MIQP, and
from CPXPROB_QCP to CPXPROB_MIQCP), even
if the provided xctype data specifies that all variables
are continuous.
This routine allows the types of all the variables to be set in one
function call. When CPXXcopyctype/CPXcopyctype is called, any current
solution information is freed.
j
to be binary by setting the corresponding xctype[j]='B'
does not change the bounds associated with that variable. A later call to
CPXXmipopt/CPXmipopt
will change the bounds to 0 (zero) and 1 (one) and issue a warning.
CPX_CONTINUOUS |
'C' |
continuous variable |
CPX_BINARY |
'B' |
binary variable |
CPX_INTEGER |
'I' |
general integer variable |
CPX_SEMICONT |
'S' |
semi-continuous variable |
CPX_SEMIINT |
'N' |
semi-integer variable |
When you build or modify your problem with this routine,
you can verify that the results are as you intended
by calling CPXcheckcopyctype
during application development.
Arguments
- env
-
A pointer to the CPLEX environment as returned by
CPXXopenCPLEX/CPXopenCPLEX. - lp
-
A pointer to a CPLEX problem object as returned by
CPXXcreateprob/CPXcreateprob. - xctype
-
An array of length
CPXgetnumcols(env, lp)containing the type of each column in the constraint matrix. Possible values appear in Table 1.
Return
The routine returns 0 (zero) if successful and nonzero if an error occurs.Example
status = CPXcopyctype (env, lp, ctype);See also the example mipex1.c distributed with the product.