MTM[triu] - compute the upper triangular matrix
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Calling Sequence
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triu(A)
triu(A,k)
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Parameters
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A
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-
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matrix, vector, array, or scalar
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k
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-
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(optional) integer
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Description
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For a matrix A, the triu(A) command returns a matrix R where R[i,j] = A[i,j] when R[i,j] is on or above the main diagonal of R. R[i,j] = 0 otherwise.
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For a matrix A, the triu(A,k) command returns a matrix R where R[i,j] = A[i,j] when R[i,j] is on or above the diagonal of R indexed by k. R[i,j] = 0 otherwise.
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The diagonals of a matrix are indexed using signed integers, where the main diagonal has index 0. Superdiagonals are indexed with positive integers and subdiagonals are indexed with negative integers.
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Examples
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