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I want to access multiple parameters that I have defined in a function
Since the ODE integration funcitons only use the first output of the ODE functiton, one option is to add them as outputs, then w...

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Locate peaks of an fft without using 'findpeaks'
In R2023a you should have the islocalmax function, that does essentially the same as findpeaks, although with slightly different...

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Why such a fuss with ndgrid and meshgrid issues?
I’m not certain what the problem is. I generally prefer scatteredInterpolant to griddata. The choce of meshgrid or ndgrid ...

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lsqcurvefit not working properly
It is difficult for me to understand what you are doing in this version of your code. You have a curve that is in part an exp...

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Overwriting the maximum function evaluation
The options structure to lsqcurvefit must be the argument to it, since (except for name-value pair arguments), arguments to MAT...

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How to use fft to analyse the refelction specturm?
It would help to have ‘xx.xlsx’, however lacking it, I will synthesize something like it — Fs = 0.1; L = 1000; t = linspace(...

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fdesign.lowpass; error messages of one of examples
@Jongsoo Kim — Your posted code works in R2024a, as demonsttrated here. You did not post the version you are using, and there c...

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Dividing daily rainfall data in to monthly data
Use a timetable and the retime function, if you have them — Rainfall = rand(ceil((1996-1961)*365.25),1)*10; ...

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Where is the polyIntersect.m function in R2024 and how do I load it ?
I can’t find it in the online documentation. There are several Mapping Toolbox functions, specifically polyxpoly, as well as ot...

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To draw campbell diagram
If you have the Signal Processing Toolbox R2015b or later, see if the rpmfreqmap function will do what you want. From its doc...

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stacked plot with 2 time series of different length and spacing
There is a way to use stackedplot with them, however it requires that they be interpolated to the same x-axis vector — files =...

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Curve fitting with loop
I would do something like this, puttting the entire code in a loop and saving the fitted parameters (and possibly the plots as w...

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legend symbol disappears when plotting a polyshape
I don’t have any specific suggestions. It works with one output, however not more than one. That the legend function has mor...

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Can we sort the variables of a table as per the values in a particular row.
I’m not certain how you were sorting them. This seems to work — T1 = readtable('Data.xlsx') T1(end-10:end,:) VN = T1.Prop...

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Using iFFt to convert acceleration PSD ((m/s²)²/Hz) to random acceleration time series (m/s²)
You cannot invert a power spectral density result, or any result using overlap-add to calculate the spectrum. The reason is si...

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How to plot a slice of the focal point in the radial direction.
This is probably straightforward, and only requires getting the data in the second plot image at the 0 value in either direction...

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Numerical Input in Pop-up box
Try something like this — trial_info = inputdlg(["What inch did you start from?","What inch did you end at?","What trial numbe...

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Question about combining surf and plot3
TThe first ‘surface plot’ is just a patch plot at that goes from 0 to 500 in each (x,y) direction, at a z-value of 0.002, as c...

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Plot 3D data from excel file
Use the scatteredInterpolant function to create the surface. Using the provided data — T1 = readtable('Copy of data.xlsx') ...

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Savitzky-Golay filtering on emg signal
Calcualte the Fourier transform of the data (fft) to determine tthe frequency content of the signal, and then use a frequency-se...

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how to specify numbers in an array with varying steps
For ‘N2’ and others, just use the individual aray indices in a vector — N = rand(1,14) N2 = N([2:4 10:11]) N2 = N([2,3,4,10,...

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Processing and identifying noises in EEG signal
The data file doesn’t exist. At least it’s not available to me. It’s bettter to attach it here, anyway. If it has an excluded...

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Making an X ray image out of x, y, z coordinates ERROR
Ir may be necessary to add the name-value pair: 'EndOfLine','\r\n' to the textscan call, since otherwise textscan fails to re...

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ylabel changes position with ax.YAxisLocation = 'origin'
The axis labels are text objects with the same properties. (Although not all the properties, such as 'VerticalAlignment' are l...

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How to do a cross-multiplication by group in a table
I am not certain what you want to do, however the fillmissing function can replace the NaN values in ‘d’ with the scalar 400. ...

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How to upsample an ECG signal and its associated data?
Use the resample function to upsample it, since this function is specifically designed for signal processing, and contains an an...

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I am having trouble reading a txt file
You may need to specify the name-value pair: 'EndOfLine','\r\n' That has usually been the solution when I have encountered si...

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How can I "connect" the colorbar to my values of a scatter plot?
I am not certain what you want to do, or what you intend by ‘connect’. One option — a = rand(1000,1); % C = 1-[a a a]; C ...

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Assistance Needed to Determine Noise in ECG Dataset
It does not appear to be excessively noisy. There is some baseline variation, however this is not present in every lead and is ...

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Import timestamps with alternating date formats
It does not actually appear to be alternating, although the trailing zeros on some may indicate that the time is not exactly tho...

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