Luke Marshall

Re-solving many times with primal simplex can lead to basis issues (rare occurrence)

4

Within a column generation setup, I've noticed that "primal simplex" can fail (with a warning) after adding columns and re-solving many times. This might be related to #1607. Technically, it...

highspy: updated highs_linear_expression to be immutable for issue #1888

2

Changes should fix #1888 * changed highs_linear_expression to be immutable by default * added `__repr__` for easier debugging and pretty print linear expressions * added `__iadd__` for mutable operations *...

Adding issue for visibility, although I've already fixed the code in #1891. Consider the following: ```python h = highspy.Highs() zero, ones = np.zeros(10), np.ones(10) h.addCols(10, zero, zero, ones, 0, [],...