# Sulaymon Eshkabilov

research interests: vibrations, optimal control, system modeling and simulation, mechatronics... coding

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Question

Why the following simple calculation is NOT consistent

Here are simple multiplication and division of scalars but the results are not consistent. What is causing this and how to make ...

12 days ago | 1 answer | 0

### 1

answerReading a variable that have different names in different data files

Have you tried this ways of reading data, e.g.: for k = 1 : nfiles fullFileName = fullnames{k}; %reading the file as a t...

14 days ago | 0

How to read a very large number, say of 700 digits?

A good solution for this exercise is vpi() fcn developed by John D'Errico: https://www.mathworks.com/matlabcentral/fileexchange...

15 days ago | 1

How to subtract background from a leaf image .

You shall use ROI mask: https://www.mathworks.com/help/images/specify-roi-as-binary-mask.html Here are a couple of threads on ...

15 days ago | 0

Array of Structures to Structure of arrays

Jan is right that your questions are not quite clear for the reader as described here. But what I've understood is the followin...

16 days ago | 0

Trying to plot multiple Euler curves with 3 different step values.

Here is the corrected complete code that computes x1, x2, x3 along with t1, t2, t3 and plots their values accordingly: a = 0; ...

16 days ago | 0

Trying to plot multiple Euler curves with 3 different step values.

There are a few unknowns and flaws in your code, e.g.: N, x1, x2, x3 are not known Within loops: N=60, N = 300, N = 3000 are n...

16 days ago | 0

Do a plot of the messages from 24 hours. Hour by Hour

Easy solution might be this, e.g.: N = numel(Time_AIS1); figure(1) stem(1:N, Time_AIS1), xlabel('Hour'), ylabel('# of message...

16 days ago | 0

how to create on an efficient way zeros in a symbolic matrix?

syms x n=4; A=sym(zeros(n,2)); % A(:,1) = zeros(n,1); % NOT Necessary % A([1:n-1],2) = 0; % NOT Necessary A(n,[...

16 days ago | 0

Undesired Graph for Transmissibility vs Frequency.

This is how you should plot it in this way: ... T4=sqrt((1+(2.*fr4.*z).^2)./((1-fr4.^2).^2+(2.*fr4.*z).^2)); loglog(om, T1+...

16 days ago | 0

| accepted

Issues plotting ode in a for loop

There are a couple of "hold on" s are missing and thus, not all simulated data get plotted. Here is the corrected part of the co...

16 days ago | 0

Would somebody please tell me whether the values are the same or not?Transition code from Session to DataAcquisition Interface

The vals should be the same.

16 days ago | 0

define parameter values for simscape model

Note that all parameters of the examples are predefined (e.g. modelling - > model properties as callbacks) and initiated automat...

16 days ago | 0

| accepted

Filtering for the selected data on table

It can be done in a few different ways. One of them is, e.g.: A = randi([10, 90],5, 3) T = array2table(A, 'variablenames', {'V...

16 days ago | 0

| accepted

Figure with 17x17 subplot

Here are a couple of 3rd party codes posted in MATHWORKS that can be used to get a better view of subplot figures by tightening ...

16 days ago | 0

Modeling concentration using ODE

You had better use this data importing fcn: data = readmatrix('test_data.dat'); Make sure that the data file (test_data.dat) ...

17 days ago | 0

Undesired Graph for Transmissibility vs Frequency.

You'd need to plot in this way: plot(om,T1); hold on plot(om,T2); plot(om,T3); plot(om,T4); grid on; hold off OR plot(om...

17 days ago | 0

Error in line for CVX

Here is the corrected part of the code: ... %cvx_begin % Invalid MATLAB command v_max = [0.08 0.01 1.13; 0 ...

20 days ago | 0

Trying to assign names to output values of 10x10

It can be done this way, e.g.: OUT = rand(5,1); for ii = 1:numel(OUT) fprintf('Ax(%d) = %f \n', [ii, OUT(ii)]) end %% OR ...

20 days ago | 0

Trying to assign names to output values of 10x10

Should I understood your question correctly, you want to assign variable names for your computation output values. If so, that i...

20 days ago | 0

How to make gif using mp4 file in MATLAB

Have you tried MATLAB's writeanimation() fcn: https://www.mathworks.com/help/symbolic/writeanimation.html what about imwrite...

20 days ago | 0

Finding Argument of Bessel Function (1st Kind) to Return Known Solution

If you set the solution range, then you will get a positive solution, e.g.: ... Sol = vpasolve(besselj(0,F), r, [0, 165])

20 days ago | 0

Trying to compress a signal.

Have you read this help DOC: https://www.mathworks.com/help/signal/ug/dct-for-speech-signal-compression.html that explains all ...

20 days ago | 0

I have a problem in solving and animation

There was one potential size related err in Y2 that is fixed. Plug in this into your code and then your simulation works OK. ....

21 days ago | 0

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Creating a pseudo-color image from a grayscale image

(1) Embed these three equations for variable x and c1, c2, c3, c4 values (2) Concatenate R, G, B that becomes the pseudocolor i...

21 days ago | 1

my code keep running continuously with no stop ... help appreciate

In your code, [while ... loop] has to be eliminated and then everything else works ok. % while true % To be eliminated ... ...

21 days ago | 0

How to plotting a 3D bar graph from 3 sets of data

Yes, it is viable to some extent what you want in MATLAB: Z = readmatrix('Mock_Data.xlsx'); ZData=Z; H = bar3(Z); for ii = 1...

21 days ago | 1

| accepted

Fill array with called function using initial conditions. Eulers based.

There are a few variables are to be defined in your two fcn files, i.e.: %Cat position program %-----------------------------...

22 days ago | 1

How to ignore NaN in a string cell

A simple answer is e.g.: TEST = test(cellfun('isclass', test, 'char')) % All NANs removed An alternative solution is e.g.: t...

22 days ago | 0

| accepted

Using variables from a .mat data file in a user-defined function

Note that the variable names stored and loaded from your *.mat file have to be consistent with the variable names called in your...

22 days ago | 0