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32 lines
583 B
Plaintext
32 lines
583 B
Plaintext
NAME
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mattrace - trace of a square matrix
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SYNOPSIS
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mattrace(m)
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TYPES
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m square matrix with summable diagonal elements
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return determined by addition of elements
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DESCRIPTION
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For a two-dimensional square matrix, mattrace(m) returns the sum of
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the elements on the principal diagonal. In particular, if m
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has been created by mat m[N,N] where N > 0, mattrace(m) returns
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m[0,0] + m{1,1] + ... + m[N-1,N-1]
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EXAMPLE
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> mat m[2,2] = {1,2,3,4}
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> print mattrace(m), mattrace(m^2)
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5 29
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LIMITS
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none
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LIBRARY
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none
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SEE ALSO
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mat, mattrans
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