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Example text
The second command uses this identifier to disable any further warnings of that type from being issued: [msg, intcat_msgid] = lastwarn; warning('off', intcat_msgid); To reenable the warning so that it will now be displayed, use warning('on', intcat_msgid); You can use these commands to disable or enable the display of any MATLAB warning. Example of Combining Unlike Integer Sizes. After disabling the integer concatenation warnings as shown above, concatenate the following two numbers once, and then switch their order.
1-40 Empty Matrices, Scalars, and Vectors Empty Matrices, Scalars, and Vectors Although matrices are two dimensional, they do not always appear to have a rectangular shape. A 1-by-8 matrix, for example, has two dimensions yet is linear. These matrices are described in the following sections: • “The Empty Matrix” on page 1-41 An empty matrix has one of more dimensions that are equal to zero. A two-dimensional matrix with both dimensions equal to zero appears in MATLAB as []. The expression A = [] assigns a 0-by-0 empty matrix to A.
Triu Return the upper triangular part of a matrix. Constructing a Matrix from a Diagonal Vector The diag function has two operations that it can perform. You can use it to generate a diagonal matrix: A = diag([12:4:32]) A = 12 0 0 0 16 0 0 0 20 0 0 0 0 0 0 0 0 0 0 0 0 24 0 0 0 0 0 0 28 0 0 0 0 0 0 32 You can also use the diag function to scan an existing matrix and return the values found along one of the diagonals: A = magic(5) A = 17 24 23 5 4 6 10 12 11 18 1 7 13 19 25 8 14 20 21 2 15 16 22 3 9 1-39 1 Data Structures diag(A, 2) ans = 1 14 22 % Return contents of second diagonal of A Returning a Triangular Portion of a Matrix The tril and triu functions return a triangular portion of a matrix, the former returning the piece from the lower left and the latter from the upper right.