Matrix Calculator

Matrix A

Matrix B

The Matrix Calculator provided here enables you to conveniently determine the matrix determinant, find the rank, calculate the sum and multiplication of matrices, and compute the inverse matrix. Simply input the matrix elements and click the designated button to obtain the desired results.

Matrix

A matrix is a rectangular array of numbers arranged in rows and columns. An n × m matrix refers to a matrix with n rows and m columns, where n and m represent the dimensions of the matrix. Each element in the matrix is identified by its position using row and column indices. Matrices are widely used in various fields, including mathematics, computer science, physics, and engineering, to represent and manipulate data or perform mathematical operations.

Matrix addition and subtraction

Indeed, matrix addition and subtraction are performed by adding or subtracting corresponding elements of the matrices. To perform these operations, the matrices must have the same dimensions.

For example, consider two matrices A and B of the same dimensions (n × m). The addition of these matrices, denoted as A + B, is obtained by adding the corresponding elements of A and B together. The result is a new matrix of the same dimensions, where each element is the sum of the corresponding elements from A and B.

Similarly, the subtraction of the matrices, denoted as A - B, is achieved by subtracting the corresponding elements of B from the corresponding elements of A. The result is a new matrix of the same dimensions, where each element is the difference between the corresponding elements of A and B.

It is important to note that both matrices involved in the addition or subtraction operation must have the same dimensions. Otherwise, the operation cannot be performed.

Matrix multiplication by a number

When multiplying a matrix by a scalar (a single number), each element of the matrix is multiplied by that scalar.

For example, consider a matrix A with dimensions n × m, and let c be a scalar. The scalar multiplication of matrix A by c, denoted as cA, is obtained by multiplying each element of A by the scalar c. The resulting matrix has the same dimensions as A, and each element is the product of the corresponding element in A and the scalar c.

Mathematically, if A = [a_ij] is the original matrix and c is the scalar, then the scalar multiplication cA is given by:

cA = [ca_ij],

where each element ca_ij is obtained by multiplying a_ij by c.

Scalar multiplication is a fundamental operation in matrix algebra and can be useful in various mathematical and practical applications, such as scaling or resizing matrices, adjusting intensity values in image processing, or representing scaling factors in linear transformations.

Transpose of a matrix

The transpose of a matrix A, denoted as A^T or A', is obtained by interchanging its rows and columns. In other words, the elements of the original matrix A[i][j] are placed in the transposed matrix A^T[j][i].

If A is an m × n matrix, then the transpose A^T is an n × m matrix. The rows of the original matrix become the columns of the transposed matrix, and the columns of the original matrix become the rows of the transposed matrix.

Similarly, when dealing with a column vector (a matrix with a single column), its transpose is a row vector (a matrix with a single row). The elements of the original column vector become the elements of the transposed row vector.

The transpose operation is widely used in various areas of mathematics, such as linear algebra, matrix operations, and solving systems of equations. It allows for convenient manipulation of matrices and simplifies various calculations and transformations involving matrices.

Matrix multiplication

When multiplying a row vector x^T (1 × m) by a column vector y (m × 1), the result is a scalar value known as the scalar product or dot product of vectors x and y. This operation is denoted as x · y and represents the sum of the element-wise products of corresponding entries in the vectors. The vectors x and y must have the same dimension (m in this case) for the scalar product to be defined.

Now, when it comes to matrix multiplication, if we have a matrix A with dimensions n × m and a matrix B with dimensions m × p, the product of A and B, denoted as C = AB, is a matrix C with dimensions n × p.

To calculate each element C_ij of the resulting matrix C, the scalar product of the i-th row of matrix A and the j-th column of matrix B is taken. This means that C_ij is obtained by multiplying corresponding elements of the i-th row of A with the j-th column of B and summing them up.

Mathematically, if A = [a_ij] is the matrix A, B = [b_ij] is the matrix B, and C = [c_ij] is the resulting matrix C, then the element c_ij is given by:

c_ij = (row i of A) · (column j of B),

where (row i of A) · (column j of B) represents the scalar product of the i-th row of A and the j-th column of B.

Matrix multiplication is a fundamental operation in linear algebra and plays a crucial role in various mathematical and practical applications, such as solving systems of linear equations, performing transformations, and representing complex relationships between variables.

Inverse of a matrix

In linear algebra, for a square matrix A to be invertible (also known as non-singular or regular), there must exist another square matrix A^(-1), called the inverse matrix, such that the product of A and A^(-1) is the identity matrix I.

Mathematically, if A is an n × n square matrix, and A^(-1) is its inverse matrix, then the following holds:

A × A^(-1) = A^(-1) × A = I,

where I is the n × n identity matrix.

The inverse matrix A^(-1) essentially "undoes" the effects of the original matrix A. When the original matrix A is multiplied by its inverse A^(-1), the result is the identity matrix I, which behaves like the "neutral" element in matrix multiplication.

Not all square matrices have an inverse. A square matrix A is invertible if and only if its determinant is non-zero. If the determinant of A is zero, the matrix is said to be singular or non-invertible.

The inverse of a matrix is a powerful concept and is used in various applications, such as solving systems of linear equations, computing matrix equations, and performing transformations. It allows for the efficient and convenient manipulation of matrices in various mathematical operations.

Determinant of a matrix

In linear algebra, the determinant is a scalar value associated with a square matrix. It is a function that takes a square matrix as input and returns a scalar value.

The determinant is denoted by the symbol det(A) or |A|, where A represents the square matrix.

The determinant is defined only for square matrices, meaning matrices that have an equal number of rows and columns. For example, a 2x2 matrix, a 3x3 matrix, or an nxn matrix (where n is a positive integer) are all square matrices for which the determinant can be computed.

The value of the determinant is determined by the elements of the matrix and follows specific rules and formulas based on the size of the matrix. The computation of the determinant can involve expanding the matrix along its rows or columns and applying mathematical operations to the elements.

The determinant of a matrix carries important information about the properties and behavior of the matrix. It is used in various areas of mathematics, such as solving systems of linear equations, determining the invertibility of a matrix, calculating areas and volumes, and performing transformations.