Answered

error in ode45 - function must return a column vector

It would help to have ‘dirfield’ (whatever it is). The other problem is that with one differential equation, ‘y0’ has to have o...

error in ode45 - function must return a column vector

It would help to have ‘dirfield’ (whatever it is). The other problem is that with one differential equation, ‘y0’ has to have o...

13 dagar ago | 0

Answered

How to convert displacment data in time series to frequency domain ie (from Amplitude (m) v/s time (s) to Amplitude (m) v/s Frequency (Hz)) using fourier transform

I wrote a utility function to do Fourier transforms. Try this — A1 = readmatrix('ellipse_r3.xlsx') figure plot(A1(:,1),...

How to convert displacment data in time series to frequency domain ie (from Amplitude (m) v/s time (s) to Amplitude (m) v/s Frequency (Hz)) using fourier transform

I wrote a utility function to do Fourier transforms. Try this — A1 = readmatrix('ellipse_r3.xlsx') figure plot(A1(:,1),...

15 dagar ago | 0

Answered

How to interpolate data as stairs

You answered your own question — stairs. Note that you can get the (x,y) coordinates as outputs from the stairs function if you...

How to interpolate data as stairs

You answered your own question — stairs. Note that you can get the (x,y) coordinates as outputs from the stairs function if you...

15 dagar ago | 0

Answered

How to remove noise of low frequency signals

Calculate the fft of the green signal (if you do not already know its spectral qualities), then use it to define the cutoff freq...

How to remove noise of low frequency signals

Calculate the fft of the green signal (if you do not already know its spectral qualities), then use it to define the cutoff freq...

16 dagar ago | 0

| accepted

Answered

How to detect the specific area from an oscilloscope signal

Perhaps something like this — jpgs = dir('*.jpg'); csvs = dir('*.csv'); for k = 1:numel(jpgs) figure imshow(imre...

How to detect the specific area from an oscilloscope signal

Perhaps something like this — jpgs = dir('*.jpg'); csvs = dir('*.csv'); for k = 1:numel(jpgs) figure imshow(imre...

16 dagar ago | 1

| accepted

Answered

Symbolic expression simplification and shortening

The expression is apparently incomplete. Working with what is provided — syms e e1 e2 h1 h2 h3 A B U = 108*A^2*e^7*e1^3*...

Symbolic expression simplification and shortening

The expression is apparently incomplete. Working with what is provided — syms e e1 e2 h1 h2 h3 A B U = 108*A^2*e^7*e1^3*...

17 dagar ago | 0

Answered

How do I check if there is a function with the same name

The which function can be helpful. which which -all If there are any others in your MATLAB search path, it should display th...

How do I check if there is a function with the same name

The which function can be helpful. which which -all If there are any others in your MATLAB search path, it should display th...

17 dagar ago | 2

Answered

How to italicize a portion of a plot label while keeping the sans-serif font?

A lot of the LaTeX options do not work in MATLAB because many of the font options are not supported. That aside, use \it to b...

How to italicize a portion of a plot label while keeping the sans-serif font?

A lot of the LaTeX options do not work in MATLAB because many of the font options are not supported. That aside, use \it to b...

18 dagar ago | 0

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Answered

Peak coming at 50Hz in every data file. How to get rid of that

If you have the Signal Processing Toolbox, use the bandstop function: Fs = ...; ...

Peak coming at 50Hz in every data file. How to get rid of that

If you have the Signal Processing Toolbox, use the bandstop function: Fs = ...; ...

18 dagar ago | 0

Answered

how can I find the intersect point of 1 plot and a yline ?

Use interp1 for this — x = [0 10 20 30 40 50 60 70 80 90]; y = [0 0.0328 0.2521 0.7975 1.7295 3.0213 4.5714 6.2283 7.819...

how can I find the intersect point of 1 plot and a yline ?

Use interp1 for this — x = [0 10 20 30 40 50 60 70 80 90]; y = [0 0.0328 0.2521 0.7975 1.7295 3.0213 4.5714 6.2283 7.819...

19 dagar ago | 1

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Answered

OBTENTION OF AN ABSORBANCE SPECTRA FROM AN IMAGE

Without some sort of calibration, what you want to do might not be possible, especially if the resolution is only integers on th...

OBTENTION OF AN ABSORBANCE SPECTRA FROM AN IMAGE

Without some sort of calibration, what you want to do might not be possible, especially if the resolution is only integers on th...

19 dagar ago | 0

Answered

Indexing of cell array and a vector

One approach — index = {[0], [0], [5], [0], [6, 7], [0], [0], [1], [0], [0], [0], [ 3]} ; data = [100, 10, 20, 15, 11, 25, 2...

Indexing of cell array and a vector

One approach — index = {[0], [0], [5], [0], [6, 7], [0], [0], [1], [0], [0], [0], [ 3]} ; data = [100, 10, 20, 15, 11, 25, 2...

19 dagar ago | 0

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Answered

how to choose windwo size in the EMG signal ?

I am not certain where you read it either, or the rationale for that particular window length calculation. I am not aware of ...

how to choose windwo size in the EMG signal ?

I am not certain where you read it either, or the rationale for that particular window length calculation. I am not aware of ...

20 dagar ago | 0

| accepted

Answered

How can I read CDF file?

Without having the file to work with, writing specific code to work with it is not possible. Start with the cdfread function...

How can I read CDF file?

Without having the file to work with, writing specific code to work with it is not possible. Start with the cdfread function...

20 dagar ago | 0

| accepted

Answered

How to store users input in a file?

If you want to read the file, try something like this — % name = input('What is your name? ','s'); % age = input('How old are...

How to store users input in a file?

If you want to read the file, try something like this — % name = input('What is your name? ','s'); % age = input('How old are...

21 dagar ago | 0

Answered

How do I fit a 3rd order polynomial Basis using fitrgp?

From the documentation, using a table as input: Each row of Tbl corresponds to one observation, and each column corresponds to...

How do I fit a 3rd order polynomial Basis using fitrgp?

From the documentation, using a table as input: Each row of Tbl corresponds to one observation, and each column corresponds to...

22 dagar ago | 0

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Answered

Displaying Text on Paper

Without knowing more about this, one option would be to use the axis function to extend the axis limits. Then the text function...

Displaying Text on Paper

Without knowing more about this, one option would be to use the axis function to extend the axis limits. Then the text function...

23 dagar ago | 0

Answered

How to use Matlab to generate a discrete uniformly distributed decimal with a value range of {0, 0.05} and a step size of 0.01?

Perhaps something like this — rv = randi([0 5], 1, 100)/100 figure histogram(rv, 5) grid .

How to use Matlab to generate a discrete uniformly distributed decimal with a value range of {0, 0.05} and a step size of 0.01?

Perhaps something like this — rv = randi([0 5], 1, 100)/100 figure histogram(rv, 5) grid .

23 dagar ago | 0

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Answered

User defined function for curve fitting, but the defined function is complicated

I thought it had something to do with scaling . That would depend on the magnitude of since it might be difficult to fit extre...

User defined function for curve fitting, but the defined function is complicated

I thought it had something to do with scaling . That would depend on the magnitude of since it might be difficult to fit extre...

24 dagar ago | 0

| accepted

Answered

Creating ID using year and event number

Try this — load('sample.mat') whos('-file','sample.mat') sample count = cumsum([1; diff(sample.Var1) < 0]); ID = year(...

Creating ID using year and event number

Try this — load('sample.mat') whos('-file','sample.mat') sample count = cumsum([1; diff(sample.Var1) < 0]); ID = year(...

25 dagar ago | 0

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Answered

Smoothing or special techniques to resolve uncertain peaks are required!!

If you want to make it smooth, there are a few options. One of course is to calculate the Fourier transform, choose a suitable ...

Smoothing or special techniques to resolve uncertain peaks are required!!

If you want to make it smooth, there are a few options. One of course is to calculate the Fourier transform, choose a suitable ...

26 dagar ago | 2

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Answered

How can I import 2D antenna radiation pattern into 2D cartesian coordinates environment?

I am not certain what you want or what your current data are. (I also do not have significant experience with the Antenna Toolb...

How can I import 2D antenna radiation pattern into 2D cartesian coordinates environment?

I am not certain what you want or what your current data are. (I also do not have significant experience with the Antenna Toolb...

26 dagar ago | 0

| accepted

Answered

Hello, How can I make the output timetable look similar in the photo, so it will 901*1 instead of 901*3

You can do that once, however if you write it and then read it, it will lose the original formatting. To illustrate — Time ...

Hello, How can I make the output timetable look similar in the photo, so it will 901*1 instead of 901*3

You can do that once, however if you write it and then read it, it will lose the original formatting. To illustrate — Time ...

27 dagar ago | 0

| accepted

Answered

Data Organization in ECG Analysis: Separate Leads or Individual Signals

I am not certain what you want to do, or what question you are asking. In general, EKG data are analysed column-wise, with a t...

Data Organization in ECG Analysis: Separate Leads or Individual Signals

I am not certain what you want to do, or what question you are asking. In general, EKG data are analysed column-wise, with a t...

27 dagar ago | 0

| accepted

Answered

Multiple Regression and Intercept

I see nothing wrong with the code, and it conforms to the example in the regress documentation. The only suggestion I have is...

Multiple Regression and Intercept

I see nothing wrong with the code, and it conforms to the example in the regress documentation. The only suggestion I have is...

27 dagar ago | 1

Answered

Plotting Cylinder Surface Using fill3

It is easier to use the surf function for this — % figure() % theta = 0:0.5:2*pi; theta = linspace(0, 2*pi, 11); xs = [cos(...

Plotting Cylinder Surface Using fill3

It is easier to use the surf function for this — % figure() % theta = 0:0.5:2*pi; theta = linspace(0, 2*pi, 11); xs = [cos(...

28 dagar ago | 0

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Answered

Is the pvalue from an lmfit table derived from a two-sided or one-sided t-test?

For what it’s worth, when I updated my polyparci function, I used a default two-sided t-distribution to calculate the probabilit...

Is the pvalue from an lmfit table derived from a two-sided or one-sided t-test?

For what it’s worth, when I updated my polyparci function, I used a default two-sided t-distribution to calculate the probabilit...

29 dagar ago | 1

| accepted

Answered

I want to solve the equation in the picture and use ode45 to solve it, but after running for 5 hours there is still no result, I would like to ask if the program is written wrong or is there any optimization?

The system is ‘stiff’ probably because of the large variation in the magnitudes of the parameters. Using a stiff solver (ode1...

I want to solve the equation in the picture and use ode45 to solve it, but after running for 5 hours there is still no result, I would like to ask if the program is written wrong or is there any optimization?

The system is ‘stiff’ probably because of the large variation in the magnitudes of the parameters. Using a stiff solver (ode1...

29 dagar ago | 0

| accepted

Answered

Plot frequency responses based on the ODE results

I am not certain what result you want. The freqz function only works on Signal Ptocessing Toolbox filter results. To use the C...

Plot frequency responses based on the ODE results

I am not certain what result you want. The freqz function only works on Signal Ptocessing Toolbox filter results. To use the C...

29 dagar ago | 0

| accepted

Answered

How do I perform a sin^2 or a cos^2 fit for my data?

Perhaps this — x = [0,10,20,30,40,50,60,70,80,90,100,110,120,130,140,150,160,170,180]; y = [880,1200,1900,2700,3300,3600,3000...

How do I perform a sin^2 or a cos^2 fit for my data?

Perhaps this — x = [0,10,20,30,40,50,60,70,80,90,100,110,120,130,140,150,160,170,180]; y = [880,1200,1900,2700,3300,3600,3000...

29 dagar ago | 0

| accepted