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Convexity

The trace of ...

Question

The trace of a matrix is defined as

Sum of all elements of the matrix

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Sum of elements in principal diagonal of the matrix

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Sum of all non-zero elements of the matrix

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None of these

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Solution

The correct option is B Sum of elements in principal diagonal of the matrix
Trace is the sum of the elements of leading diagonal of any matrix.
$A = ⎡ ⎢ ⎣ \begin{matrix} a & b & c d & e & f g & h & i \end{matrix} ⎤ ⎥ ⎦$
Trace of $A = a + e + i$

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