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Jan Orwat


StethoMe

Active since 2013

Primarily dsp engineer, algorithm developer for sound processing for IoT.
Hardware production specialist focused on prototyping, device testers designing and manufacture as well as introducing product for mass production assembly lines.

Programming Languages:
Python, R, MATLAB
Spoken Languages:
English

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  • MATLAB Mini Hack Participant
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  • Knowledgeable Level 3
  • 3 Month Streak
  • Matrix Patterns II Master
  • Introduction to MATLAB Master
  • First Review
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  • Project Euler I
  • Indexing IV Master
  • Cody 5th Anniversary Author
  • Matrix Patterns I Master

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Content Feed

Answered
How to fit a different scale to an existing plot
Check if <http://www.mathworks.com/help/matlab/creating_plots/plotting-with-two-y-axes.html this article from documentation> hel...

6 years ago | 0

Answered
I'm trying to count the number of times the gui is being run on clicking a pushbutton. How to make the count continue even after the application is closed and started again. (i.e) if the count is 8 before closing ,it should start from 9 the next time
You may specify delete function which will be called each time application/gui is closed. Using this you may save all the variab...

6 years ago | 0

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Answered
How to remove a pattern in a table column
assuming T - your table, and n - number of column containing these strings you can do as follows: T{:, n} = regexprep(T{:, ...

6 years ago | 2

| accepted

Answered
How to do a fft from a sine signal with hanning function
You can try starting with something like this fs = 44100; % sampling frequency T = 1; % period, 1 second n = T*fs; ...

6 years ago | 0

Answered
Working and non Working hours
Yes, you can. For example: % assuming your data in variable called datecolumn daytime = timeofday(datecolumn); openi...

6 years ago | 1

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Answered
Algebra function with table and vector
If you want to work on tables in MATLAB functions <http://www.mathworks.com/help/matlab/ref/varfun.html varfun> and <http://www....

6 years ago | 1

Answered
Interpolation and getting errors
Note, you are trying to access |time(0)| when |t<30|. Matlab index arrays starting with 1. Probably changing |floor(t/30)| to |...

6 years ago | 0

| accepted

Answered
how can I join points along a two plots with straight lines?
add at the end something like that: hold on plot(reshape([x,x,x].',1,[]),reshape([ytop,ybot,ytop*NaN].',1,[]))

6 years ago | 0

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Answered
Please how can I unstack a column of negative and positive values into 2 columns of positive and negative values respectively?
You can compare your data with zero. This will classify your data and you can use it to get what you want. Example based on y...

6 years ago | 0

Answered
How do I set my axis values down to zero when changing my y-axis to log scale?
There is no zero on log scale. Add one line on the end of your code: ... set(gca,'yscale','log') ylim([0.4, 3]...

6 years ago | 0

Answered
FFT and IFFT Problem (numerically and analytically result is not same)
This is caused by side effects of digital domain # You are calculating circular convolution instead of normal one. To make co...

6 years ago | 0

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Answered
Creating HDF5 file: How to create a GROUP inside a GROUP?
Use <http://www.mathworks.com/help/matlab/low-level-functions.html Low-Level Functions> such as H5G.create to create custom/nest...

6 years ago | 0

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Answered
What are the disadvantages of using uppercase 'W' in fopen compared to lowercase 'w'
I guess some memory is used for buffering purposes. There should not be *any* differences in written data. 'W' or 'A' are faste...

6 years ago | 1

Answered
What is wrong with my code
Are _TH_max1:3_ scalars, vectors or arrays? _&&_ and _||_ may be used only with scalars. Try: if(all(TH_max1(:) >= 0.4) && ...

6 years ago | 0

Answered
how to find integral for this function
In MATLAB there is a difference between calling |*| and |.*| The same is for |^| |.^| etc. Change * |*| to |.*| * |/| to...

6 years ago | 0

Answered
Using ifft to get the Fourier Coefficient
N=256; X=2*N; L=2*pi; x=linspace(-pi,pi,X); c=0; k = 2*pi*((1:2*N)-N-1)/L; % vectorised y = sin(x); % don't understand w...

6 years ago | 0

Answered
Exporting table to excel
You don't have to join tables before exporting them. You can just create spreadsheet and then add other data in other sheets or ...

6 years ago | 2

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Answered
Dividing matrix in four parts
A = zeros(210,3); %example split = [40 60 30 80]; A_split = mat2cell(A,split); [B, C, D, E] = A_split{:}; doc mat2...

6 years ago | 0

Answered
Could someone please help me speed up my code?
# If you have to use loop, <http://nl.mathworks.com/help/matlab/matlab_prog/preallocating-arrays.html preallocate> variable _RMS...

6 years ago | 1

Answered
How to rank a vector with repeats without MATLAB unique?
Do you want to replicate following behaviour? [~, ~, rank] = unique(data); rank = rank.'; There are thousands of ways...

6 years ago | 0

Answered
I have problem of ode45. please help me T_T
1. It seems your function rocket.m represents system of equations dH₁ = H₂ dH₂ = aH₁² + 127530 Verify, if it's what y...

6 years ago | 0

Answered
Problem with categorical arrays
(Copied from comments as suggested.) You are trying to make categorical array from a variable of mixed data types. categ...

6 years ago | 1

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Answered
I have a n X 2 matrix, but I want remove the points with a distance smaller than a threshold. And the data is random, which means the data position may be very far in the matrix but their distance is very close. Can anyone help me?
dataOut = uniquetol(dataIn, tolerance, 'ByRows', true); Above code should be a good starting point. In this case it would b...

6 years ago | 0

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Answered
Is there a way for breaking a loop iteration, if it takes to long?
One of the simplest ways for time control is to use tic and toc time0 = tic; timeLimit = 60*60*1; % 1 hour == 3600 secon...

6 years ago | 1

Answered
Why are title and x/y lable not listed in Children property of axes?
The answer is that those aren't axes children. Here is documentation page that mention it: <https://nl.mathworks.com/help/matla...

6 years ago | 0

Answered
Rotate Meshgrid 45 Degrees
theta = 45; x2 = x*cosd(theta) - y*sind(theta); y2 = x*sind(theta) + y*cosd(theta);

6 years ago | 0

Question


Circshift bug for sparse logical.
Hello, does anybody know if it has been reported? Circshift seems to shift sparse logicals properly, but changes trues to fal...

7 years ago | 0 answers | 3

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answers

Answered
How do i get index of a closest value from an array?
Try something like this: divisor = 900; how_close_is = abs(mod(a+divisor/2,divisor)-divisor/2); index_chunk=find(how_...

7 years ago | 0

Answered
repalacement of string with phone numbers
You can try <http://www.mathworks.com/help/matlab/matlab_prog/regular-expressions.html?s_tid=srchtitle regular expressions>: ...

7 years ago | 0

Answered
Concatenate Columns of Cells
Hello, I can see that date is of type string in your cell array and non-date fields are zeros (non-string). Assuming that in ev...

7 years ago | 0

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