Comments (5)
mtanneau
commented on May 24, 2024
The reader errors because these files are in fixed MPS format, but Free MPS is used by default.
Notably, these files have row/column names that contain spaces (including IIRC some fieldnames that are just empty).
You need to pass mpsformat = :fixed to force the use of Fixed MPS:
using QPSReader
netlib_path = fetch_netlib()
blend = readqps(joinpath(netlib_path, "BLEND.SIF"), mpsformat=:fixed)This resolves the errors on the five instances above
julia> blend = readqps(joinpath(netlib_path, "BLEND.SIF"), mpsformat=:fixed);
[ Info: Using 'BLEND' as NAME (l. 5)
[ Info: Using 'C' as objective (l. 98)
[ Info: Using '' as RHS (l. 376)
julia> prob = readqps(joinpath(netlib_path, "DFL001.SIF"), mpsformat=:fixed);
[ Info: Using 'DFL001' as NAME (l. 5)
[ Info: Using 'NIL' as objective (l. 6098)
[ Info: Using '' as RHS (l. 29101)
[ Info: Using '' as BOUNDS (l. 29934)
julia> prob = readqps(joinpath(netlib_path, "FORPLAN.SIF"), mpsformat=:fixed)
[ Info: Using 'FORPLAN' as NAME (l. 5)
[ Info: Using 'OB1PNW20' as objective (l. 21)
[ Info: Using 'RHS 1' as RHS (l. 2733)
[ Info: Using 'RNG 1' as RANGES (l. 2742)
[ Info: Using 'BND-1' as BOUNDS (l. 2744)
julia> prob = readqps(joinpath(netlib_path, "GFRD-PNC.SIF"), mpsformat=:fixed);
[ Info: Using 'GFRD-PNC' as NAME (l. 5)
[ Info: Using 'OBJ' as objective (l. 20)
[ Info: Using '' as RHS (l. 2821)
[ Info: Using '' as BOUNDS (l. 2856)
julia> prob = readqps(joinpath(netlib_path, "SIERRA.SIF"), mpsformat=:fixed);
[ Info: Using 'SIERRA' as NAME (l. 5)
[ Info: Using 'OBJ' as objective (l. 1247)
[ Info: Using '' as RHS (l. 6566)
[ Info: Using '' as BOUNDS (l. 6958)from qpsreader.jl.
dpo
commented on May 24, 2024
Ah, I see. Thank you. Maybe the reader could print a message in case of error saying something like "try reading the file with mpsformat=:fixed".
from qpsreader.jl.
mtanneau
commented on May 24, 2024
print a message in case of error
I am not 100% in favour of doing that, mainly because there is virtually no way of telling whether an error is due to fixed vs free format, or something else. For instance, in the above example, out of 5 instances, three different errors were encountered.
For what it's worth, Mosek and CPLEX also error when reading those files.
We should however add a line in the README (e.g., in "Usage") to show how one can select the MPS format, and maybe underline the difference between fixed & free format.
from qpsreader.jl.
dpo
commented on May 24, 2024
Sounds good.
from qpsreader.jl.
mtanneau
commented on May 24, 2024
Closed by #27
from qpsreader.jl.
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