Answered
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...

2 years ago | 1

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Answered
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 ...

2 years ago | 0

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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) .

2 years ago | 0

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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...

2 years ago | 0

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Answered
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...

2 years ago | 0

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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 ...

2 years ago | 0

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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...

2 years ago | 0

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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...

2 years ago | 0

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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...

2 years ago | 0

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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...

2 years ago | 0

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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...

2 years ago | 0

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Answered
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....

2 years ago | 0

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Answered
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...

2 years ago | 0

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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); ...

2 years ago | 0

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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...

2 years ago | 0

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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] ...

2 years ago | 0

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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....

2 years ago | 0

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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...

2 years ago | 0

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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...

2 years ago | 1

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

2 years ago | 1

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Answered
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, ...

2 years ago | 0

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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...

2 years ago | 0

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Answered
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...

2 years ago | 0

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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...

2 years ago | 0

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How do I make a 3D surface from table data?
Use the scatteredInterpolant function to generate the ‘Z’ matrix — T1 = readtable('Table Matlab surface.xlsx', 'VariableNaming...

2 years ago | 1

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Answered
Cannot extract real or imag part of a function
You are taking the real and imag parts of a function handle. It is necessary to evaluate the function handle first. Try thi...

2 years ago | 1

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Answered
toggle percentual from matrix
Perhaps this — per=5; a=magic(4) apr = a*(1-0.05) % 95% Of The Value apr = a*0.05 ...

2 years ago | 1

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Answered
Why I knock into a error when I want to get data from my double?
In ‘PCI1’ you are referencing ‘R’ however you are not passing it to ‘PCI1’ as an argument. Perhaps this — R = [[1 0.9954 0...

2 years ago | 1

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Answered
Unexpected flat surface with surf command
I do not completely understand the problem, however: [X, Y] = meshgrid(sort(x), sort(Dp_values)); could solve the problem. ...

2 years ago | 0

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4 equation 2 solution
Since ‘Phi’ and ‘L3’ are not defined, I created them (and ‘Alpha’) as parameters to be estimated hiere. I am not certain wh...

2 years ago | 0

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