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How to read txt file and put the words on a vector and the numbers in a matrix?
If that is the exact file, readtable is going to have problems with it. Using fgetl and textscan — type('Alexandre_2023_10...

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I have two set data and I want to calculate the area in different x and plot the area curve with respect to X
Perhaps this — x=[1 1.5 1.7 2 2.2 2.6 2.8]; y=[0 2 6 7 8 10 5]; int_y = cumtrapz(x, y); figure plot(x, y, 'DisplayName',...

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Drawing a turning tangent on fitted curve
Perhaps this — xvalue = 20:1:30 yvalue = [56.7 59.8 64.8 66.7 66.2 65.2 64.2 63.5 63.0 62.7 62.5] p = polyfit(xvalue, yval...

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How to draw a rectangle around the area that shows an energy variation
It would help to have your data. An adaptive approach using contour3 — Fs = 500; L = 300; t = linspace(0, L*Fs, L*Fs+1)/F...

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How to make the for loop the length as the array inside the for loop?
You do not need the loop at all. Just use the diff function — x1 = [1e6:20000:5e6]; L = 4e6; % in m D_c = 5000;% in m D1 =...

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Can I create the same FIR filter using two different commands?
Getting the same filter using ttwo differnt methods is probably possible. Comparing a windowed design (using kaiserord here wit...

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How can I create a bandpass FIR filter using firpm?
I could not get this to work with firpm, since it apparently only works with lowpass filters. Getting it to work with fir1 i...

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Changing exponential axis scale
I am not certain what the problem is. The approach you took appears to work here (R2023b) — c = 3e+08; % Speed of light in ...

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How To solve this equation?
One approach — syms x f = symsum(((5*x+2)^(1/5))/x, x, 1, 1E+3) fvpa = vpa(f) .

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Adding values to a table
One approach (that works) — DateTime = datetime([2020 01 01]) + calmonths(0:5)'; Incidence = randi(10,6,1); tab = table(Dat...

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i want to convert my data to time series.
This is a common problem in biomedical signal processing, and is referred to as creating an ensemble. One example using a photo...

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plot with two variables.
I can’t run the code without the variables. That aside, choose vector ranges for ‘phi_rad’ and ‘phi1_rad’ and use the ndgrid ...

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How to do weighted least square rgression?
One option is to use fitlm — weight=[18.5204555170429; 24.8007492441765; 21.4204953742493; 12.0007299687922; 5.17482448096073...

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Split data based on column value to write in different sheets in excel
Using accumarray, one line to segment the matrix, then one loop to write the file sheets (and a second loop to verify the result...

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How to make an automated and updated legend for ts step response graph
The Control System Toolbox plots are characteristically difficult to work with. The best option would be: [y,tOut] = step(F...

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How can I replay the results I got with the pspectrum function on the spectrogram function?
You can’t equate the pspectrum and spectrogram function outputs because the units are different. The spectrogram function produ...

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Summing elements in an array between uneven date intervals
I am not certain what you want. If I am readiing the file correctly and converting the dates correctly (both 'excel' and 'posix...

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How performing FRF for complex functions
Try this — s = tf('s'); H = (1257*s + 3.736e05) / (s^2 + (1554 - 2e02i)*s + (3.736e05 - 2e02i)) opts = bodeoptions; opts....

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Simple Vector Indexing Question
Put all the indices inside one set of square brackets — Vector = 1:20; activeVector = Vector([3:7 10:15]) This is a simplifi...

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overlap logical matrices in MATLAB
Use the logical or (|) function to accumulate the matrices — dis_threshold=0.4; a = false(5); ...

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Dificulty plotting graph of function for basic bending moment graph
Use the second argument to fplot to limit the independent variable range — %bending moments calculator syms X %force 1 F1=5...

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Polar Scatter Plot using 3 Data Set
Try this — th = linspace(0,2*pi,20); r = rand(1,20); a=[1:1:20]; sz = 75; % polarscatter(th,r,sz,a,'filled') [x,y,z] ...

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How can I know which ditribution is appropriate to fit on the generated histogram? and, How can I do that?
I would use the histfit function, then if the fit appears to be acceptable, use the fitdist funciton to estimate the parameters....

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Can MATLAB plot hypergeometric functions?
I do not understand what you need to plot because I do not understand your notation, however the Statistics and Machine Learning...

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Error in FFT calculation
The value for ‘L’ is 7500 and for ‘L1’ is 601. If you change: P21 = abs(Y1/L1); to P21 = abs(Y1/L); you will get the ex...

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Lorentzian fit for defined peak
First, locate the peaks using findpeaks or islocalmax to get the peak values (amplitudes) and locations. The findpeaks function...

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Need help on how to CREATE a text file in matlab?
‘Do I use fopen or table function?’ It depends on what you want to do. If you have a numeric array with column text headings, ...

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Loading and Plotting .mat file
If you want to plot the ‘wl’ field in each one, this works — Files = dir('*.mat'); figure tiledlayout(3,3) for k = 1:nume...

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Why derivatives using matlab symbolic for a simple fuction produces different results?
They both produce the same results when I run your code — syms x y %define function z=x+1i*y; theta = angle(z); Ig1=exp(-t...

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Continuous vs discrete time
It is difficult to follow what you are doing as you describe it. It might be best to use the Control System Toolbox functions i...

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