get_epspivot
Returns epspivot.
REAL get_epspivot(lprec *lp);
Return Value
get_epspivot returns the value of epspivot.
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
Remarks
The get_epspivot function returns the value that is used as a tolerance
for the pivot element to determine whether a value should be considered as 0.
Floating-point calculations always result in loss of precision and rounding
errors. Therefore a very small value (example 1e-99) could be the result of
such errors and should be considered as 0 for the algorithm. epspivot specifies
the tolerance to determine if a pivot element should be considered as 0. If
abs(value) is less than this epspivot value it is considered as 0 and at
first instance rejected as pivot element. Only when no larger other pivot
element can be found and the value is different from 0 it will be used as pivot
element.
The default epspivot value is 2e-7
Example
#include <stdio.h>
#include <stdlib.h>
#include "lp_lib.h"
int main(void)
{
lprec *lp;
REAL epspivot;
/* Create a new LP model */
lp = make_lp(0, 0);
if(lp == NULL) {
fprintf(stderr, "Unable to create new LP model\n");
return(1);
}
epspivot = get_epspivot(lp);
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_epspivot,
set_infinite, get_infinite,
set_epsint, get_epsint,
set_epsd, get_epsd, set_epsel,
get_epsel, get_epsperturb, set_epsperturb, set_mip_gap, get_mip_gap
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