is_piv_mode
Returns if pivot mode specified in testmask is active.
unsigned char is_piv_mode(lprec *lp, int testmask);
Return Value
is_piv_mode returns TRUE or FALSE.
Parameters
lp
Pointer to previously created lp model. See return value of
make_lp, read_lp,
read_LP, read_mps, read_freemps, read_MPS, read_freeMPS, read_XLI
testmask
PRICE_PRIMALFALLBACK (4) |
In case of Steepest Edge, fall back to DEVEX in primal |
PRICE_MULTIPLE (8) |
Preliminary implementation of the multiple pricing scheme. This means that
attractive candidate entering columns from one iteration may be used in the
subsequent iteration, avoiding full updating of reduced costs. In the current
implementation, lp_solve only reuses the 2nd best entering column alternative |
PRICE_PARTIAL (16) |
Enable partial pricing |
PRICE_ADAPTIVE (32) |
Temporarily use First Index if cycling is detected |
PRICE_RANDOMIZE (128) |
Adds a small randomization effect to the selected pricer |
PRICE_LOOPLEFT (1024) |
Scan entering/leaving columns left rather than right |
PRICE_LOOPALTERNATE (2048) |
Scan entering/leaving columns alternatingly left/right |
Remarks
The is_piv_mode function checks if the pivot mode
specified in testmask is active. The pivot mode is an extra modifier to the
pivot rule. Any combination (OR) of the defined values is possible.
Example
#include <stdio.h>
#include <stdlib.h>
#include "lp_lib.h"
int main(void)
{
lprec *lp;
unsigned char piv_mode;
/* Create a new LP model */
lp = make_lp(0, 0);
if(lp == NULL) {
fprintf(stderr, "Unable to create new LP model\n");
return(1);
}
piv_mode = is_piv_mode(lp, PRICE_ADAPTIVE); /* Will return TRUE, because this is the default */
delete_lp(lp);
return(0);
}
lp_solve API reference
See Also make_lp,
read_lp, read_LP, read_mps,
read_freemps, read_MPS, read_freeMPS, read_XLI, set_pivoting,
get_pivoting, is_piv_rule
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