Initializing help system before first use

XPRSscale (SCALE)

Purpose
Re-scales the current matrix.
Topic area
Numerics
Synopsis
int XPRSscale(XPRSprob prob, const int rowscale[], const int colscale[]);
SCALE
Arguments
prob 
The current problem.
rowscale 
Integer array of size ROWS containing the powers of 2 with which to scale the rows, or NULL if not required.
colscale 
Integer array of size COLS containing the powers of 2 with which to scale the columns, or NULL if not required.
Related controls
Integer
OBJSCALEFACTOR 
Custom objective scaling factor.
SCALINGMETHOD 
Type of scaling.

Example 1 (Library) 
XPRSreadprob(prob,"jovial","");
XPRSscale(prob,NULL,NULL);
XPRSlpoptimize(prob,"");
This reads the MPS file jovial.mat, rescales the matrix and seeks the optimal objective value.
Example 2 (Console)
The equivalent set of commands for the Console user would be: 
READPROB jovial
SCALE
LPOPTIMIZE
Further information
1. This function currently does not apply to general nonlinear problems.
2. If rowscale and colscale are both NULL then the matrix will be scaled according to the current scaling controls ( SCALINGMETHOD, SCALINGORDER, SCALINGBIGM and SCALINGOPS). If rowscale or colscale or both are non- NULL, the values passed in those arrays will be used for scaling rows or columns or both, respectively.
3. Objective scaling is applied according to the control OBJSCALEFACTOR, independently of the rowscale and colscale arguments.
4. Any existing scaling will be replaced by the scaling specified by rowscale and colscale.
5. This function cannot be called while the current problem is being solved or when it is in an interrupted state. Use XPRSpostsolve to restore the problem to a non-solving state.
Related topics
XPRSreadprob ( READPROB).

Parent Topic Console and Library Functions

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