Support abs generalized expressions
#27
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jonathanberthias
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cvxpy
jonathanberthias
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abs generalized expressions
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Part of #23
The absolute value is now handled in the scalar, vector and matrix cases. Auxiliary variables are added to the model to represent the absolute values.
Note
Extracted from #26 as there were too many changes at once 😅
It helped to reveal some issues when using matrices as the shape wasn't kept after translation. Also, constant absolute values are evaluated directly instead of generating variables.