# LH

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Question

Re-index a vector based on the indices of another vector

Hi all, I have a vector : A = [1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 1 1 2 2 1 1 3 3 1 1 3 3 1 1 3 3 1 1 3 3 1 2 1 4]; whe...

9 days ago | 2 answers | 0

### 2

answersQuestion

sorting values of a matrix column when the other column has the same value

Hi all, I have a matrix that has two columns as following: A = [0.1 0.1 ; 0.1 -0.3 ; 0.1 0.5 ; 0.1 0; 0.1 -0.5; 0.1 -0.1; 0.1 ...

3 months ago | 1 answer | 0

### 1

answerQuestion

indexing groups of elements in a vector in a certain way

Hi all, I have two vectors and where they look like the following: %vector A A = [1 1 4 1 5 1 6 1 5 2 ...

4 months ago | 1 answer | 0

### 1

answerQuestion

re-indexing slices of a matrix

Hi all, I have a matrix where its second column represents the index of each row. I want to replace these values so that they ...

4 months ago | 1 answer | 0

### 1

answerQuestion

count number of elements for each slice of a vector

Hi all, I have the folloiwng vector: A = [2 1; 3 1; 4 2; 5 2; 6 2; 7 1; 8 1 ; 7 1; 5 2...

4 months ago | 1 answer | 0

### 1

answerextract multiple slices of difference sizes from a vector

I think I have solved it: A = [1 4 6 5 4 8 7 8 6 4]'; groups = 3; end_count = cumsum(num(:)); for i = 1:groups if...

4 months ago | 0

Question

extract multiple slices of difference sizes from a vector

Hi all, I have a vector of the shape: A = [1 4 6 5 4 8 7 8 6 4]; and I want to split this vector into slices. The number of ...

4 months ago | 2 answers | 0

### 2

answersQuestion

Rename the indices of a vector in a certain way.

Hi all, My code below has a vector and its index vector . It goes throguh the elements of and when it finds a zero element, i...

4 months ago | 1 answer | 0

### 1

answerQuestion

Extract the indices based on the minimum absolute value

Hi all, I have two matrices: and . Each row of matrix has an identifier (index). I want to get the identifiers of each row o...

4 months ago | 2 answers | 0

### 2

answersQuestion

Assign 3d points to multiple cluster when their coordinates meet certain conditions

Hi all, I am trying to assign each point of the 3D dataset I have to the "correct" cluster based on certain conditions. The cod...

7 months ago | 1 answer | 0

### 1

answerQuestion

Vector sliding average over different number of points

Hi all, I have a number of blocks, to be exact, and inside each block there is a certain number of points. The number of point...

8 months ago | 1 answer | 0

### 1

answerFinding out the mesh indices of randomly generated points

Thanks for your help and suggestions. I think I have solved this. % Find out the cell index of each row on DATA [~, ~, ~, bin...

9 months ago | 0

| accepted

Question

Finding out the mesh indices of randomly generated points

Hi, I want to find out where does each point from the randomly generated list belong in the pre-defined mesh grid of and . The...

9 months ago | 1 answer | 0

### 1

answerQuestion

Calculate angles correctly between two vectors using the dot product.

Hi all, As shown below in the figure, I have two vectors, and , and I want to calculate the angle with the norm, and, between e...

10 months ago | 3 answers | 0

### 3

answersQuestion

Go around matrices/vectors columns

Hi all, If I have a point on one of a pentagon edges, say , and I want to calculate the vectors coorindates between this point ...

1 year ago | 1 answer | 0

### 1

answerQuestion

calculate the averages of non-squared matrix blocks

Hi, I have a non-squared matrix with a dimension of and I would like to calculate the averages of each block so I can get a ...

1 year ago | 2 answers | 0

### 2

answersQuestion

Reshape matrix dimensions to a larger and sparse one

Hi all, I have matrix with dimensions . I have also a sparse matrix with dimensions with different elements. I'd like to ch...

1 year ago | 1 answer | 0

### 1

answerQuestion

Calculate the average of each matrix block

Hi, I have a square matrix as shown below in my code and I would like to ocalculate the averge of each block of it. My code i...

1 year ago | 5 answers | 0

### 5

answersQuestion

Calculate the average of a matrix

Hi, I have a square matrix with dimension . I want to take average of all elements inside each block that includes 4 horizontal...

1 year ago | 3 answers | 0

### 3

answersQuestion

Name points on a plot based on their order

Hi, I have the follwoing points: %define points ri = [0.3 0.1 ; 0.7 0.1 ; 0.5 0.3 ; 0.1 0.3 ; 0.1 0.7 ; ...

2 years ago | 1 answer | 0

### 1

answerQuestion

shift a block of rows to the end of a matrix

Hi, Suppose I have a matrix: A = [0 0.2000; 0 0.1578; 0 0.0721; 0 0; 0 0; ...

2 years ago | 1 answer | 0

### 1

answerQuestion

anticlockwise points coordinates sorting

Hi, I have the follwoing points cooridnates: A = [0 0 ; 1 0.2; 0 1 ; 0 0.6; 1 0 ; 1 1 ; 0.6...

2 years ago | 1 answer | 0

### 1

answerQuestion

sort a matrix in a specific way

Hi, I have two matrices that correspond to points coordinates and I want to sort their concatenation in a way illustrated below...

2 years ago | 2 answers | 0

### 2

answersQuestion

Add indicative labels to vector values

Hi, If I have two vectors: A1 = [ 1 ; 2 ; 3 ]; A2 = [ 4 ; 5 ; 6 ]; Concatenating these two vectors gives: A = [A1 ; A2]; ...

2 years ago | 3 answers | 0

### 3

answersQuestion

Extract rows that their columns have specific values

Hi, I have the following matrix: A = [ 0.1 0 ; 0.5 0 ; 3 0 ; 0 0 ] and I want to extract the row...

2 years ago | 2 answers | 0

### 2

answersQuestion

Slope of line intersecting with y axis

Hi, I am trying to caluclate the slope of a line intersecting with one of the axes. I do understand that, as shown in the figur...

2 years ago | 1 answer | 0