1 votes 1 votes Is a null matrix also a diagonal matrix? i read somewhere atleast one element in diagonal should be non zero to be a diagonal matrix //provided null matrix will be square and can a null square matrix be a scalar matrix ? sumit goyal 1 asked Sep 3, 2017 • edited Sep 4, 2017 by sumit goyal 1 sumit goyal 1 779 views answer comment Share Follow See all 6 Comments See all 6 6 Comments reply LeenSharma commented Sep 4, 2017 reply Follow Share A diagonal matrix is always a square matrix in which non-principle diagonal elements are zero but principal diagonal elements can be zero or none zero but Null matrix can be a square or rectangular matrix. Hence, we can say that square null matrix is also a diagonal matrix. 1 votes 1 votes LeenSharma commented Sep 4, 2017 reply Follow Share we can say that, the null matrix can be a diagonal matrix but null matrix should be square. A zero square matrix is lower triangular, upper triangular, and also diagonal. 1 votes 1 votes Shubhanshu commented Sep 4, 2017 reply Follow Share Means Null matrix should be square matrix then it will definetly be a diagonal matrix. rty?? 0 votes 0 votes sumit goyal 1 commented Sep 4, 2017 reply Follow Share Shubhanshu bro different people have different views some saying atleast one element in diaagonal should be non-zero to be a diagonal matrix 0 votes 0 votes Bikram commented Sep 20, 2019 reply Follow Share SQUARE null matrix is also a diagonal matrix. Null matrix can be square or rectangular matrix and diagonal matrix are types of square matrix. Null matrix is one whose all elements are equal to 0. Diagonal matrix is a square matrix whose non diagonal elements are equal to 0 and diagonal elements may/may not be equal to zero. So, we can say that,null matrix can be diagonal matrix but null matrix should be square. For more details, you may refer ://www.quora.com/Is-a-null-matrix-also-a-diagonal-matrix 0 votes 0 votes Bikram commented Sep 20, 2019 reply Follow Share How do we determine whether a matrix has an inverse? ://www.researchgate.net/post/How_do_we_determine_whether_a_matrix_has_an_inverse 0 votes 0 votes Please log in or register to add a comment.