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Here is part of a ".bas" file given by HiGHS using serial dual simplex method to solve an LP problem:

HiGHS v1
Valid
# Columns 57471
3 1 1 3 3 1 1 3 3 1 1 3 1 3 3 1 ...

What does the number "3" mean? I know that "1" indicates the basic variables, "0" indicates the non-basic variables at their lower bounds and "2" indicates the non-basic variables at their upper bounds.

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Here is the enum documentation:

https://ergo-code.github.io/HiGHS/stable/structures/enums/#HighsBasisStatus

But you have to infer that kLower is 0 and so on.

The status 3 is kZero: A free variable is nonbasic and set to zero

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