## How do you flip a matrix diagonally in Matlab?

How to mirror matrix on the diagonal?

1. I = imread(‘onion.png’);
2. I2 = flipdim(I ,2); %# horizontal flip.
3. I3 = flipdim(I ,1); %# vertical flip.
4. I4 = flipdim(I3,2); %# horizontal+vertical flip.

## How do you convert a matrix to an upper triangular matrix in Matlab?

U = triu( A ) returns the upper triangular portion of matrix A . U = triu( A , k ) returns the elements on and above the kth diagonal of A .

Is the transpose of an upper triangular matrix?

The transpose of an upper triangular matrix is a lower triangular matrix and vice versa. A matrix which is both symmetric and triangular is diagonal.

How do you flip an image diagonally in Matlab?

Take transpose of the image. % across secondary diagonal. Im = I(:, :, k); %Flip every layer up to down.

### How do you change uppercase to lowercase in Matlab?

newStr = lower( str ) converts all uppercase characters in str to the corresponding lowercase characters and leaves all other characters unchanged.

### Is a diagonal matrix upper triangular?

Diagonal matrices are both upper and lower triangular since they have zeroes above and below the main diagonal. The inverse of a lower triangular matrix is also lower triangular. The product of two or more lower triangular matrices is also lower triangular.

How do you split a matrix into a lower and upper triangular matrix?

[LU,P] = step(lu,A) decomposes the matrix A into lower and upper triangular matrices. The output LU is a composite matrix with lower triangle elements from L and upper triangle elements from U . The permutation vector P is the second output.

How do you change to uppercase in MATLAB?

Description. newStr = upper( str ) converts all lowercase characters in str to the corresponding uppercase characters and leaves all other characters unchanged.

## How do you find the upper and lower triangular matrix in Matlab?

L = tril( A ) returns the lower triangular portion of matrix A . L = tril( A , k ) returns the elements on and below the kth diagonal of A .

## How do you check if a matrix is upper triangular in Matlab?

tf = istriu( A ) returns logical 1 ( true ) if A is an upper triangular matrix; otherwise, it returns logical 0 ( false ).

How do you transpose a matrix in MATLAB?

Transpose vector or matrix – MATLAB transpose .’ transpose, .’ B = A.’ returns the nonconjugate transpose of A, that is, interchanges the row and column index for each element. If A contains complex elements, then A.’ does not affect the sign of the imaginary parts.

How do you create a diagonal matrix in MATLAB?

Create diagonal matrix or get diagonal elements of matrix. collapse all in page. Syntax. D = diag(v) D = diag(v,k) x = diag(A) x = diag(A,k) Description. example. Run the command by entering it in the MATLAB Command Window. Web browsers do not support MATLAB commands.

### What does the upper triangular portion of a matrix include?

The upper triangular portion of a matrix includes the main diagonal and all elements above it. The shaded blocks in this graphic depict the upper triangular portion of a 6-by-6 matrix.

### What is a DIAG matrix in MATLAB?

Diagonal elements, specified as a vector. If v is a vector with N elements, then diag (v,k) is a square matrix of order N+abs (k). diag ( []) returns an empty matrix, [].