Initializing help system before first use

getiisdata

Purpose
Returns information for an Irreducible Infeasible Set: size, variables and constraints (row and column vectors), and conflicting sides of the variables.
For pure linear problems there is also information on duals, reduced costs and isolations.
Synopsis
getiisdata(prob, iis)
Arguments
prob 
The current problem.
iis 
The ordinal number of the IIS to get data for.
Return value
A list with the following elements:
nrows
The number of rows in the IIS.
ncols
The number of bounds in the IIS.
rowind
Indices of rows in the IIS.
colind
Indices of bounds (columns) in the IIS.
contype
Sense of rows in the IIS:
L
for less or equal row;
Can be NULL if not required.
G
for greater or equal row.
E
for an equality row (for a non LP IIS);
1
for a SOS1 row;
2
for a SOS2 row;
W
for a piecewise linear constraint;
X
for a general constraint;
I
for an indicator row.
bndtype
Sense of bound in the IIS:
U
for upper bound;
Can be NULL if not required.
L
for lower bound.
F
for fixed columns (for a non LP IIS);
B
for a binary column;
I
for an integer column;
P
for a partial integer columns;
S
for a semi-continuous column;
R
for a semi-continuous integer column.
duals
The dual multipliers associated with the rows.
djs
The dual multipliers (reduced costs) associated with the bounds.
isolationrows
The isolation status of the rows:
-1
if isolation information is not available for row (run iis isolations);
Can be NULL if not required.
0
if row is not in isolation;
1
if row is in isolation.
isolationcols
The isolation status of the bounds:
-1
if isolation information is not available for column (run iis isolations);
Can be NULL if not required.
0
if column is not in isolation;
1
if column is in isolation.
Further information
Please refer to the C documentation for more details.

Parent Topic R interface reference manual

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