Is there a function in HIGHS to convert HIGHS solution file format to GLPK solution file format using highspy?

[hbshrestha]

Hello. I am currently using HIGHS to solve a mps file and get a solution file using the following code:

import highspy

h = highspy.Highs()
filename = 'abc.mps'
h.readModel(filename)

h.setOptionValue("solver","ipm")

h.run()

h.writeSolution("abc_highs_solution.sol", 1)

The solution file format of HIGHS looks as shown below. It has two different sections for columns and rows:

I am putting some sample rows and columns below:

Columns
Index Status Lower Upper Primal Dual Name
0 BS 0 0.012 0.01 0 XD001.....aaa023
1 BS 0 0.012 0.012 0 XD001.....aaa024
2 BS 0 0.012 0.012 0 XD001.....aaa025
3 BS 0 0.012 0.012 0 XD001.....aaa026
4 BS 0 0.012 0.012 0 XD001.....aaa027
5 BS 0 0.012 0.012 0 XD001.....aaa028
Rows
Index Status Lower Upper Primal Dual Name
0 BS -inf 75684.3 0 -0 Is.Ba........026
1 BS -inf 75684.3 0 -0 Is.Ba........027
2 BS -inf 75684.3 0 -0 Is.Ba........028
3 BS -inf 75684.3 0 -0 Is.Ba........029
4 BS -inf 75684.3 0 -0 Is.Ba........030
5 BS -inf 75684.3 0 -0 Is.Ba........031

I need to get the solution into the GLPK solution file format which is as shown. It also has two sections for rows and columns.

I am putting some sample rows and columns below:

PROBLEM NAME abc.mps
DATA NAME
OBJECTIVE VALUE 3.619197E+07
STATUS OPTIMAL SOLN
ITERATION 59011

OBJECTIVE func (MIN)
RHS
RANGES
BOUNDS

SECTION 1 - ROWS

NUMBER ......ROW....... AT ...ACTIVITY... SLACK ACTIVITY ..LOWER LIMIT. ..UPPER LIMIT. .DUAL ACTIVITY

   1  func             BS    3.619197E+07   -3.619197E+07            NONE            NONE               1
   2  Is.Ba........026 BS               0         75684.3            NONE         75684.3              -0
   3  Is.Ba........027 BS               0         75684.3            NONE         75684.3              -0
   4  Is.Ba........028 BS               0         75684.3            NONE         75684.3              -0
   5  Is.Ba........029 BS               0         75684.3            NONE         75684.3              -0

SECTION 2 - COLUMNS

NUMBER .....COLUMN..... AT ...ACTIVITY... ..INPUT COST.. ..LOWER LIMIT. ..UPPER LIMIT. .REDUCED COST.

139322 XD001.....aaa023 BS 0.01 0 0 0.012 0
139323 XD001.....aaa024 BS 0.01 0 0 0.012 0
139324 XD001.....aaa025 BS 0.01 0 0 0.012 0
139325 XD001.....aaa026 BS 0.01 0 0 0.012 0
139326 XD001.....aaa027 BS 0.01 0 0 0.012 0

Is there a functionality available to convert the HIGHS solution file to the GLPK solution file format?

[jajhall]

I think so. I wrote code to write out the solution in Glpsol format (raw and "pretty"), and this is achieved by passing 2 (kSolutionStyleGlpsolRaw) or 3 (kSolutionStyleGlpsolPretty) as the style argument to writeSolution(filename, style)

[hbshrestha]

Thank you for the response. I will check it out.

[hbshrestha]

By passing 3, I am getting very similar to the GLPK format I shared in the question. Header names are different.
h.writeSolution("abc_highs_solution.sol", 3)

The new solution format looks as shown: