Substitute a value in a system of linear (in)equations
1  subst_value(A, b, variables, values, remove_columns = FALSE)

A 

b 

variables 

values 

remove_columns 

A list
with the following components:
A
: the A
corresponding to the simplified sytem.
b
: the constant vector corresponding to the new system
A system of the form Ax <= b
can be simplified if one or more of the
x[i]
values is fixed.
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