Add up all the elements in a NxM matrix where N signifies the number of the rows and M signifies the number of the columns.
Example :
x= [ 8 1 6]
The total sum of the elements will be 8+1+6= 15.
improve test suit
I did this simply because the test-suity is so unbelievably bad.
Please fix it so this solution is no langer valid.
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construct matrix with identical rows
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Replace every 3rd element in a vector with 4
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