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# Jonathan Demmer

##### Last seen: 8 jours ago
9 total contributions since 2018

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Question

How to create a matrice from selected rows from other matrices
Hello all, I would like to select a specific row (4187) from n matrices (n =20) and add these rows in a new matrice. I wrote th...

2 mois ago | 1 answer | 0

### 1

Question

save graph in video
Hi all, My supervisor gave me this code. I modified it to make it work like i wnated. However i would like at the end of the ...

2 mois ago | 2 answers | 0

### 2

Question

delete column from matrix
Hi all, I have a matrix 6964x1441. I would like to keep the column every 24 (keep column 24, 48, 72 etc) and delete the other...

8 mois ago | 1 answer | 0

### 1

Question

matrix creation from a loop
Hello all, I would like to create 60 vector columns of zeros (6964,1) called lat_01_days, lat_02days, lat_03_days until 60. I...

8 mois ago | 3 answers | 0

### 3

Question

Soustraction between all line of a matrix
Hello all, I have a matrix (6964,1) i would like to do a mathemetical operation between each line of the matrix. i mean line 1 ...

8 mois ago | 2 answers | 0

### 2

Question

Counting number of individuals between a box
Hello, I have 7000 particles scattered in an area. I would like to count the number of them in one particular area delimited by...

10 mois ago | 1 answer | 0

### 1

Question

Problem using WindRose package
Hello all, I downloaded the package called WindRose 150622. I wrote a really simple code as an exampl.. But a message error a...

plus d'un an ago | 1 answer | 0

### 1

Question

Convert matrix 3d into 2d
Hello all, I have matrix (a*b*n) (3d matrix), I would like to convert it into n 2D matrix (a*b). Can someone help me, please?...

plus d'un an ago | 1 answer | 1