OEF matrices
--- Introduction ---

This module actually contains 49 exercises of various styles on matrices.

Example matrix 2x2

Column and row 2x3

Column and row 3x3 I

Column and row 3x3 II

Determinant and rank

Let and be two matrices ×, such that and . Then

.

(You should put the most relevant reply.)

Det & trace 2x2

Det & trace 3x3

Diagonal multiplication 2x2

Left division 2x2

Right division 2x2

Equation 2x2

Suppose that a matrix satisfies the equation . Determine the inverse matrix in function of a,b,c,d.

More exactly, each coefficient of must be a polynomial of degree 1 in a,b,c,d.

Formula of entries 2x2

Let C=(cij) the matrix 2×2 whose entries are defined by

cij = .

Formula of entries 3x3

Let C=(cij) the matrix 3×3 whose entries are defined by

cij = .

Formula of entries 3x3 II

Let

C = (ci,j) = ( )

be a 3×3 matrix whose entries ci,j are defined by a linear formula ci,j=f(i,j)=ai+bj+c.

Determine the function f(i,j).

Given images 2x2

We have a 2×2 matrix , such that

,
. , .

Determine .

Given images 2x3

We have a matrix , such that

,
,
. , , .

Determine .

Given images 3x2

We have a matrix , such that

,
. , .

Determine .

Given images 3x3

We have a 3×3 matrix , such that

,
,
. , , .

Determine .

Given powers 3x3

We have a matrix , with

, .

What is ?

Given products 3x3

We have two matrices and , with

, .

What are and ?

Matrix operations

Consider two matrices

.

Does make sense?
Does make sense?
Does make sense?
Does make sense?
Does make sense?

Min rank A^2

Let A be a matrix ×, of rank . What is the minimum of the rank of the matrix A2 ?

Multiplication of 3

We have 3 matrices, , , , whose dimensions are as follows.

MatrixABC
Dimension× × ×
Rows
Columns

Give an order of multiplication of these 3 matrices that makes sense.

In this case, what is the dimension of the matrix product? × rows and columns.

Multiplication 2x2

Partial multiplication 3x3

We have an equation of multiplication of matrices × as follows, where the question marks represent unknown coefficients.

Step 1. There is only one determinable coefficient in the product matrix. It is .
(Type c11 for for example.) Step 2. The determinable coefficient is = .

Partial multiplication 4x4

We have an equation of multiplication of matrices × as follows, where the question marks represent unknown coefficients.

Step 1. There is only one determinable coefficient in the product matrix. It is .
(Type c11 for for example.) Step 2. The determinable coefficient is = .

Partial multiplication 5x5

We have an equation of multiplication of matrices × as follows, where the question marks represent unknown coefficients.

Step 1. There is only one determinable coefficient in the product matrix. It is .
(Type c11 for for example.) Step 2. The determinable coefficient is = .

Sizes and multiplication

Consider two matrices and , with

, and .

What is the size of ?

Reply: has rows and columns.

Parametric matrix 2x2

Parametric matrix 3x3

Find the values of the parameters and such that the matrix
verifies det and trace .

Parametric rank 3x4x1

Consider the following parametrized matrix.

Fill-in: Following the values of the parameter , the rank of A is at least and at most .

The rank is reached when is .

Parametric rank 3x4x2

Consider the following parametrized matrix.

Fill-in: Following the values of the parameters and , the rank of A is at least and at most .

The rank is reached when is is .

Parametric rank 3x4x1

Consider the following parametrized matrix.

Fill-in: Following the values of the parameter , the rank of A is at least and at most .

The rank is reached when is .

Parametric rank 3x5x2

Consider the following parametrized matrix.

Fill-in: Following the values of the parameters and , the rank of A is at least and at most .

The rank is reached when is is .

Parametric rank 4x5x1

Consider the following parametrized matrix.

Fill-in: Following the values of the parameter , the rank of A is at least and at most .

The rank is reached when is .

Parametric rank 4x5x2

Consider the following parametrized matrix.

Fill-in: Following the values of the parameters and , the rank of A is at least and at most .

The rank is reached when is is .

Parametric rank 4x6x1

Consider the following parametrized matrix.

Fill-in: Following the values of the parameter , the rank of A is at least and at most .

The rank is reached when is .

Parametric rank 4x6x2

Consider the following parametrized matrix.

Fill-in: Following the values of the parameters and , the rank of A is at least and at most .

The rank is reached when is is .

Pseudo-inverse 2x2

We have a 2×2 matrix A, with

  .

Please find the inverse matrix of A.

Pseudo-inverse 2x2 II

We have a 2×2 matrix A, with

  .

Please find the inverse matrix of A.

Pseudo-inverse 3x3

We have a 3×3 matrix A, with

  .

Please find the inverse matrix of A.

Quadratic solution 2x2

Rank and multiplication

Let C be a matrix of size ×, of rank . What is the condition on n, in order that there exist a matrix A of size ×n and a matrix B of size n×, such that C=AB ?

Square root 2x2*

Symmetry of the plane

What is the nature of the plane transformation given by the matrix  ?

Symmetry of the plane II

Among the following matrices, which one corresponds to the of the plane?

Trace of A^2 2x2

Unimodular inverse 3x3

Compute the inverse of the matrix

  .

Unimodular inverse 4x4

Compute the inverse of the matrix

  .

Other exercises on: matrices   determinant   linear algebra  

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