# Sam

### Katholieke Universiteit Leuven

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**Feeds**

Question

Reading textfile using fopen and textscan

Hello, I've got a textfile 'test_file.txt' which you can find in attachment. At the bottom of this textfile, you can see ' [...

3 years ago | 1 answer | 0

### 1

answerQuestion

Why does video slow down towards the end?

Hello, I've written a code to display circles on my video every 100th frame (9000 frames in total, 25fps). At the first frame, ...

3 years ago | 1 answer | 0

### 1

answerQuestion

Find a specific word in a textfile and insert 2 new lines in front of it

Hello, I've got a very basic question which I can't seem to figure out. I've got a textfile in which I want to find the word ...

3 years ago | 0 answers | 0

### 0

answersQuestion

Use sprintf in callback function to get an output variable

Hello, I've got a very simple callback function 'countclicks', which displays the type of click (normal,alt,extend or open) a...

3 years ago | 1 answer | 0

### 1

answerQuestion

readFrame() too slow. How to switch too VideoFileReader and VideoPlayer?

Hello, I've written a code in which a user has to click on the video while it is being played. Unfortunately, the readFrame()...

3 years ago | 1 answer | 0

### 1

answerQuestion

How to draw circles at the start of a video and display these circles again at specified framecounts?

Hello, I am trying to write a program in which the user has to draw 5 ellipses at the beginning of the video. Is there a way ...

4 years ago | 1 answer | 0

### 1

answerQuestion

How to extract data from diary?

Hello, I've used the diary function to create a diary file. When I open the diary file, I've got the following: normal ...

4 years ago | 2 answers | 0

### 2

answersQuestion

Stop execution of function using a specific key press

Hello, I am trying to write a program where the user has to click several times on a video that is being played. After the us...

4 years ago | 1 answer | 0

### 1

answerQuestion

Capture left mouse click on moving objects in live video

Hello, I am trying to write a small program which displays a video and captures left mouse clicks on this live video. The vi...

4 years ago | 0 answers | 0

### 0

answersQuestion

Legend in plot using forloop

Hello, I am trying to plot the legend of 3 things here: temperature data (continuous blue line), the starting point of a sit pe...

4 years ago | 1 answer | 0

### 1

answerQuestion

Find 625 consecutive ones in vector

Hello, I have a 45000x1 rowvector, which contains only 1's and 0's. I want to find the periods of 625 consecutive ones and lo...

4 years ago | 1 answer | 1

### 1

answerQuestion

For loop using strings

Hello, I have accelerometry data in the x, y and z-plane. Now I'm writing code and always doing the same thing 3 times... I w...

4 years ago | 1 answer | 0

### 1

answerQuestion

remove trend in temperature data

Hello, In attachment you can find a figure of temperature data over the next 2.2 days. This temperature is the leg temperatur...

4 years ago | 1 answer | 0

### 1

answerQuestion

Selecting specific values in timestamp

Hello, I have a 7000000x8 matrix. In the second column, I have the timestamp information (e.g.: 11/02/2020 14:19:34.000). My ...

4 years ago | 1 answer | 0

### 1

answerQuestion

Load textfile into Matlab

Hello, I have the following textfile (see figure). The first line says 'eating'. The second line is the time when eating occ...

4 years ago | 0 answers | 0

### 0

answersQuestion

How can I label a vector?

Hello, I have a vector of 10 random numbers. I want to label the first 5 elements in the vector as '1'. I want to label the l...

5 years ago | 2 answers | 0

### 2

answersQuestion

trapz between 2 points

Hello, I want to calculate the integral under a curve between 2 specific points on the x-axis. How can I do this? Thanks....

5 years ago | 1 answer | 0

### 1

answerQuestion

How to insert fieldname character type into struct type?

Hello, This is my code: load('Cal_Lags.mat'); % % there are 4 treatments. Treatment 1 consists of 30 subjects. fn = fieldn...

5 years ago | 1 answer | 0

### 1

answerQuestion

How to store 4 outputs in 1 variable?

Hello, I can't seem to find the solution for my problem. I created a function which gives 4 outputs. I call the function in...

6 years ago | 1 answer | 0

### 1

answerQuestion

Error using plot for symbolic function

Hello, My code is the following one: syms g(x) x t = [0:0.005:4]; wn = 10; zeta = 2; g(x) = wn/(sqrt((zeta*z...

6 years ago | 1 answer | 0

### 1

answerQuestion

Simple ODE can't be solve by dsolve

Hello, I'm trying to solve the following differential equation: dx2/dt = (-x2/0.19) + (x3/12) Both x2 and x3 are functi...

6 years ago | 1 answer | 0

### 1

answerQuestion

Lotka-volterra with ode45

I have the following system of differential equations: P' = P − 0.05PR R' = −0.5R + 0.02PR My function is the following...

6 years ago | 1 answer | 0

### 1

answerQuestion

Wrong plot with ode15s

I'm trying to plot the solution for the following differential equation function y=probleemvergelijking(t,x) y = (-100*x +...

6 years ago | 1 answer | 0

### 1

answerQuestion

Error using ode45

I have created the following function for my differential equation function y=opdracht8(x) y = 0.08x -2000 and i try to...

6 years ago | 1 answer | 0

### 1

answerQuestion

How to plot a differential equation?

Hello, I've got the following differential equation: dN(t)/dt - ((k - (a*N(t)))*N(t)) = f(t) This is the logistic law of pop...

6 years ago | 1 answer | 0

### 1

answerQuestion

Sorting dataset, which contains strings, by one column

Hello, I have a matrix of 1198x17. The first column is a column containing only strings. The first row contains 1 stringcell ...

8 years ago | 1 answer | 0

### 1

answerQuestion

Reference to non-existing field

Hello, I wrote a code but it gives the error "Reference to non-existing field 'Cycle'". All the fields I want to reference to...

8 years ago | 1 answer | 0

### 1

answerQuestion

How do I exclude data knowing the rownumbers?

In parameter 'I' i have the rownumbers of the values i want to keep in a dataset. All the other rows have to be deleted. How do...

8 years ago | 2 answers | 0

### 2

answersQuestion

comparing 2 vectors for duplicates

Hello, I have a vector of 465051 x 1 elements, and a vector of 1197 x 1 elements. The 465051 vector contains all the 1197 el...

8 years ago | 1 answer | 0

### 1

answerQuestion

how to find columnnumber of a specific headername?

I have a dataset 69x821. I used this code: [num, txt, raw] = xlsread('data_copy'); In txt are all the headers for the va...

8 years ago | 1 answer | 0