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Trying to Filer Baseline Signal Noise - Getting Additional Peaks at High Frequencies
The problem may be your filter design. If you have R2018a or later and the Signal Processing Toolbox, use the highpass functi...

1 year ago | 0

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Constructing a string with several index requirements
I’m not certain what you need, however this is one option — r2 = [0 30 60 90 120 150 180 210]; command=['S...

1 year ago | 0

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Scatter Plot following a colormap regulation
The DisplayName name-value pair will use that information for the legend entry for each plotted pont. If you want the station n...

1 year ago | 0

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Plot files with legend names indicated from a value from each file
All the files have the same format, so this is straightforward — mats = dir('*.mat'); numprof = numel(mats); couleur = jet...

1 year ago | 0

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Integration symbiolic form in matlab gives error
If you have R2012a or later, use the integral2 function instead — Part_1=@(r,theta) 1+(2.*(1+r.*cos(theta))).^2; W_i=@(r,thet...

1 year ago | 0

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Assistance Needed with FIR Comb Peak and Notch Filter Design in MATLAB
The peak filter was a bit challenging, however I got it to work reasonably well. The comb filter may not exactly meet your de...

1 year ago | 1

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curve fitting using lsqcurvefit on kinetic data for parameter estimation
The model itself is a bit misleading. A better option might be: That produces an equivalent fit with paramete...

1 year ago | 0

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Detect main part of a signal
I usually use the envelope function, usually using the 'peak' option, and then test for the first instance of those (ususlly the...

1 year ago | 0

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FFT result dependent on number of interpolation points
The interpft function is intended to interpolate the Fourier transform, and it does a reasonably good approximation. I checked ...

1 year ago | 0

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Answered
Convert string into datetime
It would help to have the file. Try this — Date_Time_rural = ["2023-10-31 00:00:00"; "2023-11-01 00:00:00"; "2023-11-02 00...

1 year ago | 0

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Fourier Series Representation of Periodic Functions
I would write the piecewise call differently — syms t omega a_k = piecewise(0 <= t < 0.4, 1, 0.4 <= t < 0.5, -1) figure ...

1 year ago | 0

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I am taking two excel files with similar x value data and want to plot the y values of one of the plots with different colors based on if the second file reads 0 or 1.
This is something of a challenge. In order to be able to use both records, it is necessary to intterpolatee the shorter record ...

1 year ago | 0

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Why does the phase response get cutoff beyond a frequency?
The most likely reason is that the filter numerator coefficients are close to the limit of floating-point approximation error. ...

1 year ago | 1

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finding relation between two variables, being discharge and water level in a river
Your question is a bit ambiguous. If you have data of some sort and you want to fit that model to it in order to deteermine ...

1 year ago | 0

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Slope of some groups of data separated by NaNs
I am not certain what you want for ‘values’. This prints the equation of the regression line for each line — load('data_min...

1 year ago | 0

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Site Response Analysis - FFT
Just looking at your code (without having the data), one problem could be that your amplification function is defined only over ...

1 year ago | 0

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convert time domain data to frequency domain
There are 6839 missing (non-sequential) rows in this file, so to use fft you will first have to interpolate them so they are seq...

1 year ago | 0

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plomb ifft sequence??? please help me!!!!
The plomb function returns the power spectral density of the input time-domaiin signal. In order to do in inversee Fourier tran...

1 year ago | 0

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How to extract areas of contourf-plots below a given level
It is a bit difficult to follow your code. In my additions, these lines: idx = find(contourData(1,:) == contourLevel); cle...

1 year ago | 1

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Hi, I want to how can we convert the contour geometry to stl file?
Try something like this — % clc; clear; close all; % Generating simple SDF [x, y] = meshgrid(linspace(-2, 2, 100), linspac...

1 year ago | 1

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Answered
Skipping Optional Positional Arguments
I usually use varargin rather than arguments, however your calling syntax may not be appropriate To illustrate — out = foo(1,...

1 year ago | 0

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Creating a sinewave with logarithmic frequency
Using the logspace function could work. Try this ’— % Generate log-frequency sweep then plot it and its spectrogram NPTS...

1 year ago | 0

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Answered
How to plot a 2D pcolor with contours only at specific levels?
Using the vector works here, and your code runs without error in R2024b — load('data.mat') whos('-file','data') pcolor(lon...

1 year ago | 0

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Answered
Default bode axis to Hz in R2024b
I did not see any changes to that in the Release Notes, however that does not mean that they were not changed. The only relevan...

1 year ago | 1

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Downsampling array data from counts per minute to counts per hour
That depends on what you want to do. I would use a timetable and the retime function — Time = datetime(2004,10,23,17,00,00)...

1 year ago | 0

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Answered
Interpolate missing hourly and daily data
Usee the retime function with a timetable — filename = "Missing_data.xlsx"; T1 = readtable(filename); T1.Properties.Variable...

1 year ago | 0

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How to fit an XRD pattern to ambient solid and liquid patterns to extract qualitatively solid and liquid fractions?
It depends what the pattern is, and whether it is 2D or 3D. MATLAB has several fitting (parameter estimation and optimisation...

1 year ago | 0

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how do I fprintf a power?
Using ‘char(178)’ is an option — gof.rsquare = 0.975; fprintf("R"+char(0178)+"; %.4f%s%.4f\n", gof.rsquare) .

1 year ago | 0

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Answered
MATLAb Solve function not solving
Your code works in R2024b — clear all close all syms I1 I2 V0 s=2; eqns=[5*I1+4*I2+1/(s*0.1)*I1+2*s*I1==1, 4*I2-3*V0==...

1 year ago | 1

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ode45 integration issues for some choices of physical parameters,
‘I'm not aware of any division by zero being performed;’ The denominator does not have to be equal to zero, it just has to be...

1 year ago | 0

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