To replace all NaN elements of the matrix B with zero, use. In matrix A on the left, we write a 23 to denote the entry in the second row and the third column.. One way to remember that this notation puts rows first and columns second is to think of it … Weisstein, Eric W. "Zero Matrix." (1d) A square matrix U is said to be upper triangular if u ij =0 i>j. Zero matrices are sometimes also known as null matrices (Akivis and Goldberg 1972, p. 71). In each case, determine if the system is consistent. can be generated in the Wolfram Language From Amer., 1943. If you want to write in bold, you can use the same approach as with "blackboard bold", e.g. $\mathbb A$ ( \mathbb A ). I'm writing for a graph theory audience, if that helps pick a notation. B(isnan(B)) = 0 Or you could replace all the spaces in a string matrix str with underscores. 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