Procedure GMP::Column::Unfreeze(GMP, column)

GMP::Column::Unfreeze

The procedure GMP::Column::Unfreeze removes the frozen status of a column in a generated mathematical program.

GMP::Column::Unfreeze(
     GMP,            ! (input) a generated mathematical program
     column          ! (input) a scalar reference or column number
     )

Arguments

GMP

An element in AllGeneratedMathematicalPrograms.

column

A scalar reference to an existing column in the matrix or an element in the set Integers in the range \(\{ 0 .. n-1 \}\) where \(n\) is the number of columns in the matrix.

Return Value

The procedure returns 1 on success, and 0 otherwise.

Note

• Use GMP::Column::UnfreezeMulti or GMP::Column::UnfreezeRaw if many columns have to be unfrozen, because that will be more efficient.

• During a call to procedure GMP::Column::Freeze AIMMS stores the upper and lower bound of the column before the procedure was called. This information is used when procedure GMP::Column::Unfreeze is called thereafter. This information is not copied by the function GMP::Instance::Copy. Therefore the call to GMP::Column::Unfreeze in the following piece of code is useless:

  GMP::Column::Freeze( gmp1, x1, 20 );
  gmp2 := GMP::Instance::Copy( gmp1, "cpy" );
  GMP::Column::Unfreeze( gmp2, x1 );
  

See also

The routines GMP::Instance::Generate, GMP::Column::UnfreezeMulti, GMP::Column::UnfreezeRaw, GMP::Column::Freeze and GMP::Instance::Copy.