# Sulaymon Eshkabilov

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

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Solving coupled ODEs via ode45

If your equation is implicit then, ode15i might be the tool to use. https://www.mathworks.com/help/matlab/ref/ode15i.html

2 months ago | 0

length error don't know why

Check this in the command window: which length If by mistake any variable or M-file was called by length, the variable can be...

2 months ago | 0

Error using imread>get_full_filename (line 566) File "gg(21).jpg" does not exist. Error in imread (line 375) fullname = get_full_filename(filename);

You can add the path to the directory where your images are located using addpath(), e.g.: addpath('C:\Users\new\Testing')

2 months ago | 0

Generate and acquire signals with a DT9857E box using Matlab

It is all about DAQ DT9857E issue. Once we had also the same issue - a kind of exponential decay. So far, I remember what we ...

2 months ago | 0

| accepted

help with wavelet analysis - wcoherence plot

If understood your question correctly, follow this doc: https://www.mathworks.com/help/wavelet/ref/wcoherence.html#d126e131143 ...

2 months ago | 0

How to move the Yaxis exponent outside

Here is one example how to get it done: % Sample data for plot display x = linspace(0, 2*pi, 100); y = 1e6 * sin(x); %% De...

2 months ago | 1

how to find point from Table data in Simulink?

Do the followings: Feed the temperature and density values as inputs to the lookup table block The output of the lookup tab...

2 months ago | 1

Ray tracing in antenna chamber

Have you checked out this documentation: https://www.mathworks.com/help/comm/ref/rfprop.raytracing.html?s_tid=answers_rc2-1_p4_...

2 months ago | 0

Is this a logical Error in Matlab ? exp (pi*i*6) = 1.000000000000000 - 0.000000000000001i. WHY an i component ?, should just be 1

It is all about a display format: format short exp(pi*i*6) % compare with this: cos(6*pi)+1i*sin(6*pi) % Compare this: fo...

2 months ago | 0

Multiple loops to build structure?

It can be done somewhat what like this one: GN = {'Group 1:'; 'Group 2:'; 'Group 3:'}; NA = {'North'; 'East'; 'West']; for ...

2 months ago | 0

| accepted

How do I graphic

The given inequality does not have explicit solution. Therefore, by ignoring analytical constraints, these can be obtained: sym...

2 months ago | 0

Starting with the ramp signal r(t) and unit step signal u(t) given below, please write the codes to plot the following transformed versions (a-f):

t=-10:10; figure plot(t,t); grid on xlabel('Samples') ylabel('Amplitude') title('Ramp') figure t2=[zeros(1,100), on...

2 months ago | 0

unable to connect blocks in Simulink

Use Simulink-PS converter block: https://www.mathworks.com/help/simscape/ref/simulinkpsconverter.html

2 months ago | 0

| accepted

how to plot two m.file in one plot

use plot(x, y), e.g.: x = [-5:5;2*(-5:5); 3*(-5:5)]; y = [3*x.^2+3*x-3; -5*x.^2+5*x-15; -2*x.^2-3*x-13;]; plot(x(1,:),y(1,:),...

2 months ago | 0

Inverse FFT of a matrix

Just looking at your attached figure, it is clear along x axis is time. inverse FFT gives back time domain data from freq domain...

2 months ago | 0

Why can't I run my code? (tfest function)

Here it is running ok: x = readtable('data_thermal_pulse.txt'); time = x.Var1; T1 = x.Var2-x.Var2(1); input = x.Var4; Ts = ...

2 months ago | 0

Why does this function not work for decimals?

Here is the corrected answer (Note abs(x)<=1): % x = input("Please enter the value of x (in radians): "); % Here "input" prom...

2 months ago | 0

| accepted

How to find an area below the curve follwed by x and y axis having two different parameters?

That would be something like this: DATA = [53 100; 26.5 88.5; 9.5 64.95; 4.75 46.85; 2.36 25.34; 0.85 23.14; 0.425 0;]; ...

2 months ago | 0

help understand the step size of the electrical engine dyno example

Click on Modeling Tab --> Model Explorer --> Base Workspace, and then you will see that the sampling time is 1E-5 in seconds. Se...

2 months ago | 0

How to randomly sample output times in Simbiology?

To randomly generate values using MEAN and STD values, normrnd() fcn can be used: MEAN_val = 15; % Mean in minutes STD_dev ...

2 months ago | 0

How to get rid of Noise in Simulink?

There are a few blocks can be used. E.g., Discrete Filter (Transfer Function), Discrete FIR Filter, etc., whcih can be found: Si...

2 months ago | 0

Matlab Plotting command problem

Even though you have not mentioned any error, there is a tiny point linked with hold on command. It needs to be followed at the ...

2 months ago | 0

| accepted

How to ignore special characters and retrieve the data prior to the character

Here is one possible solution, to get the data correctly from the data file: % Open the data file for reading FID = fopen('tem...

2 months ago | 0

Solve equations of motion containing matrices and partial derivatives

Your posted code has a few critical issues to be addressed before executing it. (1) epsilon_rp is undefined; (2) y(1) =4.3; bu...

3 months ago | 0

Summing two signals should result in zero, but doesn't

Note that the matlab's PRECISION is not ABSOLUTE. See this example of Pythogorian theorem: a = -pi:pi/100:pi; F = 1 - (sin(a)....

3 months ago | 0

how to convert a 3D surface into a 2D contour?

Note that it is clear from the colorbar scale (Figure 2 in your question) that there must be another operation before obtaining ...

3 months ago | 0

Error in resampling function

If you want to use fs = 5000 Hz, then the command syntax has to be resample(x_siganl, time, fs_new) This is how it should be don...

3 months ago | 0

| accepted

How to compute forces in global reference frame?

Presuming that you are also using some blocks from SimScape toolbox in the Simulink environment, here are some points to conside...

3 months ago | 0

How do I change the current directory in Simulink Onramp?

Even if you are working online, you can still go for "Save As" option (upper left corner) to select the directory where to save ...

3 months ago | 1

how to convert a 3D surface into a 2D contour?

This is how it can be done: H = openfig('ds2.fig'); % This is the extracted plot figure h = findobj(gca, 'Type', 'surfac...

3 months ago | 0