The elementwise absolute negative portion of an expression, -min_elemwise(x,0)
.
neg(x)
An '>Expression representing the negative portion of the input.
# NOT RUN {
x <- Variable(2)
val <- matrix(c(-3,3))
prob <- Problem(Minimize(neg(x)[1]), list(x == val))
result <- solve(prob)
result$value
# }
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