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MatTrace

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Interactively run this function

Answer  
9

Parameter NameInputAn input expression?Delimiter
Mat1

Calculation description
Time-stamp calculation?  
  


Function Description

Returns the trace of an  (i.e. square) matrix , i.e. the sum of the elements on the main diagonal (from upper left to lower right) of , i.e.:

 

 

where  is the entry on the i’th row and j’th column of .

 

The trace is a linear map which is invariant under cyclic permutations, e.g. in general  but  etc.

 


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