# Pawel Jastrzebski

### Mahle Engine Systems Ltd

Project Leader at Product Testing department.

Mahle UK R&D Center for automotive engine plain bearings.

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**Content Feed**

How to properly apply cellfun in this case - text spliting

<https://uk.mathworks.com/matlabcentral/profile/authors/3073010-rik-wisselink Rik Wisselink>, <https://uk.mathworks.com/matlabce...

3 years ago | 0

Question

How to properly apply cellfun in this case - text spliting

I've got a table like this and my task is to separate the parameter name from a value: t = 10×1 table ...

3 years ago | 3 answers | 0

### 3

answersError using figure: First argument must be a figure object or a positive Integer

The doc says the input argument must be of double type: <</matlabcentral/answers/uploaded_files/128021/Capture.PNG>>

3 years ago | 0

| accepted

How do I plot a multivariate distribution?

Consider the following example: NoOfPoints = 1000; % Generate 'x' and 'y' x = rand(NoOfPoints,1); y ...

3 years ago | 0

| accepted

Question

How to use 'setvartype' to get the variable as 'datetime' formatted as: yyyy-MM-dd

I've got a spreadsheet which gets imported into Matlab via *readtable()*. Prior to importing I use *detectImportOptions()* an...

3 years ago | 2 answers | 0

### 2

answersHow to generate a sine signal in which initially frequency increases linearly, then remains constant for some time and again decreases linearly.

Would it look like this: <</matlabcentral/answers/uploaded_files/126310/untitled.jpg>> % y = sine(2*pi*f*t) t...

3 years ago | 0

| accepted

Plotting multiple trajectories on map

This is roughly how I would go about this problem [code untested]: % Get all the file names in the folder filename = dir...

3 years ago | 0

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Why is the correlation matrix much larger than the original matrix?

Have you checked the documentation for the corrcoef function? It explains exactly how the results are obtained: * <https://uk...

3 years ago | 1

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Plotting very small values using bar command

If you have a mix of relatively high and low values, you might want to consider using the logarithmic scale for the y-axis, i.e....

3 years ago | 0

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How to apply function to certain files in directory

Just get the function to work on the selected files in the folder to begin with: i.e. fileNames = dir('*.raw'); % ...

3 years ago | 0

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How to remove consecutive duplicates ?

Consider the following example: ConsecDuplic = [1 2 2 3 4 5 5 5 6 7 8 9 9] % Logical vector: % check if next val...

3 years ago | 0

How can I recognize an empty row in the middle of an Excel file?

Consider the following code: % STEP 1: LOAD DATA % load excel file to a table t = readtable('BF1.xlsx'); % thi...

3 years ago | 0

I need to put data from columns in different cells into one vector

Consider the following example: % 1. Create fake data (you'll use the real data) % create empty cell 1x20 c = cel...

3 years ago | 0

I am getting Unbalanced or unexpected parenthesis or bracket?

*Line 1:* get rid of the comma: if PlotVI_Module *Line 15 and 25:* change round brackets to square ones and you had a on...

3 years ago | 1

how to add numbers and labels to scatterplot bubbles?

There's a function called: * <https://uk.mathworks.com/help/matlab/ref/text.html?s_tid=doc_ta Text> that is used for label...

3 years ago | 0

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How do I change axes orientation to a desired one

See documentation for: * <https://uk.mathworks.com/help/matlab/ref/view.html?searchHighlight=view&s_tid=doc_srchtitle view> ...

3 years ago | 0

Cut random 30secs of audio from an audio recording .wav

This code will allow you to import and export all of the audio files in your current folder: % get file names in the ...

3 years ago | 0

How to extract information from the filename?

This will get you the structure of all of the text files in your current folder: x = dir('*.txt') % structure In m...

3 years ago | 0

How to find vectors that are multiple of other vectors inside a matrix

I think this will get you going. This code will help you identify which 'NextRow' is a multiplier of 'previousRow': % DATA ...

4 years ago | 0

How do i plot?

Is this what you meant? dt = 0.0001; t = 0:dt:0.02; y = (5+cos(20*pi*t)).*cos(2*pi*100*t); figure; plot(...

4 years ago | 0

| accepted

How to plot vertical lines for reference using vline?

I've moved my comment to the answer so the question can be closed. I've also tried to copy your example to show you what I think...

4 years ago | 0

Covariance calculation like excel formula

Given the code: A = randi([18 22], 20,1) B = randi([15 25], 20,1) C = cov(A,B) This is the outcome that you'll...

4 years ago | 1

| accepted

How to add an interval to a number?

This example should have the answers to your problems: % Values that can be changed in the code: % d, Xu, Yu % or...

4 years ago | 1

2D color or surface plot based on 3 vectors of data

How about this: % interpolation data % as in: % https://uk.mathworks.com/help/matlab/ref/scatteredinterpolant.html?se...

4 years ago | 0

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2D color or surface plot based on 3 vectors of data

In order to be able to use contour plot, your Z data need to be of X*Y size. What you can do is the following: % C is a ma...

4 years ago | 0

how compute the pixel sum for image?

# Use <https://uk.mathworks.com/help/matlab/ref/imread.html#btnczv9-1-A imread - output> to load the image into Matlab and store...

4 years ago | 0

Getting corresponding y values from moving average graph when having x values

Consider the following example: % RANDOM DATA startDate = datetime(2018,01,01); endDate = datetime(2018,04,01); ...

4 years ago | 1

To label same X axis twice

You can certainly add minor ticks and show them on the grid but I'm not sure if there's an easy way to label them. In other word...

4 years ago | 0

Long-horizon predictive regressions

The R value calculation is available in Matlab: * <https://uk.mathworks.com/help/matlab/ref/corrcoef.html R coefficient> As ...

4 years ago | 0

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how to save 120 figures in a folder defined by user and later retrieve it?

When you say 120-off figures: * Are these matlab figures *.fig*? Also, see the code below that was used to create what is ...

4 years ago | 0