text: Program to check if matrix is upper triangular | Function to check matrix is in upper triangular ; Driver function .
code: def isuppertriangular ( M ) : NEW_LINE INDENT for i in range ( 1 , len ( M ) ) : NEW_LINE INDENT for j in range ( 0 , i ) : NEW_LINE INDENT if ( M [ i ] [ j ] != 0 ) : NEW_LINE INDENT return False NEW_LINE DEDENT DEDENT DEDENT return True NEW_LINE DEDENT M = [ [ 1 , 3 , 5 , 3 ] , [ 0 , 4 , 6 , 2 ] , [ 0 , 0 , 2 , 5 ] , [ 0 , 0 , 0 , 6 ] ] NEW_LINE if isuppertriangular ( M ) : NEW_LINE INDENT print ( " Yes " ) NEW_LINE DEDENT else : NEW_LINE INDENT print ( " No " ) NEW_LINE DEDENT