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The sum of the diagonal entries in a matrix.
matrix_trace(expr)
An '>Expression or matrix.
An '>Expression representing the trace of the input.
# NOT RUN { C <- Variable(3,3) val <- cbind(3:5, 6:8, 9:11) prob <- Problem(Maximize(matrix_trace(C)), list(C == val)) result <- solve(prob) result$value # }
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