Changes between Version 1 and Version 2 of Ticket #20302


Ignore:
Timestamp:
03/27/16 19:22:08 (4 years ago)
Author:
mkoeppe
Comment:

Description modified to remove my comments about variable_upper_bound and variable_lower_bound. I was misled by the interface description in GenericBackend, which was out of sync with the real backends. Fixed in #20296

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  • Ticket #20302 – Description

    v1 v2  
    33 - `add_col` and `add_variable` both add a variable to the problem; but `add_col` only allows to add a column with no name; whereas `add_variable` only allows to add a column with no coefficients. There should be one function (`add_variable`, probably - see #20296 for a possible interface) that can do both; should then deprecate `add_col`. (Also compare with `add_linear_constraint`, which takes a zipped index/coefficient list, whereas `add_col` takes two parallel lists.)
    44
    5  - `variable_upper_bound`: This interface is bizarre.  Can't remove an upper bound from a variable because `None` means both 'no upper bound' and 'get the upper bound'. Likewise `variable_lower_bound`. (Moreover, there's redundancy with `col_bounds`.)
    6 
    75 - `add_variables` and `add_linear_constraints` should have a default implementation in `GenericBackend`, like `add_linear_constraint_vector`.
    86