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I am not getting a linear plot, how can I get a plot that consist all the data points?
You are asking it to read 30 rows across 4 columns, and it is doing exactly that — T1 = readtable('https://www.mathworks.com/m...

4 years ago | 0

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How to count the number of peaks from a graph with a certain threshold?
The findpeaks function only works on vectors, so assuming that the first column of the Excel file is the independent variable an...

4 years ago | 0

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How to make an axis that goes up and down?
The tick values must be monotonically increasing or decreasing. The tick labels can be whatever you want. x = 0:15; y = -0....

4 years ago | 0

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How to add legends?
Try this — r1=[19.38 65.3 15.32;16.66 62.13 21.21;18.21 58.31 23.49;19.11 59.95 20.94;16.53 67.27 16.19;19.41 63.87 16.72]; ...

4 years ago | 1

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Common part of 2D and 3D plot
I am not certain what result you want. It is straightforward to rotate the 3D plot to give a 2D view from the Z-axis — Uz =...

4 years ago | 1

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plot a surface for g-f=0
That is challenging, however it will work with certain restrictions on the matrix dimensions (i.e. they must both be the same si...

4 years ago | 0

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How can i generate a noise signal of specific frequency range like a noise signal from 100hz to 150hz .
Generate a random signal (perhaps using randn) of an appropriate size, and then filter it (perhaps using bandpass).

4 years ago | 0

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Trouble trying to plot the output of an input signal with an impulse response
Use the fplot function — syms t s; x = (5/7)*exp(-t) - (12/7)*exp(-8*t); % x = x(t) h = cos(2*t) + 4*sin(2*t); % h = h(t) ...

4 years ago | 0

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How to fixed the axis order in hist3 plot?
The problem may be using imagesc. Try set(gca, 'YDir','normal') x = randn(100,1); y = randn(100,1); data = [x y]; figu...

4 years ago | 0

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Convert numerical label Vector to char label
Try this — map = {'as','be','ce'}; % Cell Array a=[1 1 2 1 3 1 3 2]; b = map(a) b = strtrim(sprintf...

4 years ago | 0

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Errorbars on a select dataset
Try this — data2 = sortrows(randn(10,5),2); % Correct For Missing Data Experimental = sortrows(randn(10,5)...

4 years ago | 0

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Indexing cell array column from excel data
I do not have the matrices, however if they are already imported, use MATLAB indexing conventions to address them — g=Experime...

4 years ago | 0

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Anti-aliasing filter design
Yes, generally. The lowpass function designs a FIR filter by default, and will design an efficient elliptic IIR filter if the '...

4 years ago | 0

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How to calculate circular mean every 8 cells?
One option would be to ‘decompose’ the angles into their ‘x’ and ‘y’ components, calculate the means of those, and then use atan...

4 years ago | 0

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HI all, would somebody please help me find out what should i do ? there an error in coError: File: FileScema.m Line: 10 Column: 7 Unexpected MATLAB expression.
Perhaps — A = [1 1 1.06 0.00 0.00 0.00 0.00 0.00 0.00 0.00 2 2 1.05 ...

4 years ago | 0

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How to estimate different FFT plots using Welch's method
See the documentation on the pwelch function. Its inputs are time-domain vectors (or matrices in which each column of the matri...

4 years ago | 0

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Display string line by line
Use fprintf — str = {'cats', 'dogs', 'birds'}; fprintf('%s\n',str{:}) .

4 years ago | 1

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How to plot contour?
Another option would be contour3 — % Make x-y mesh grid x = [-4.2195; -5.7195; -7.2195; -8.7195; -2.7195;...

4 years ago | 0

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Contour comparison with same colorbar limits.
As far as plotting them, in order to see the differences, it would likely be better either to subtract the two surfaces and plot...

4 years ago | 0

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Hi, do anyone know how to remove grid from the pressure contour?
I am not certain what you want to do. Perhaps: surfc(xq,yq,pq, 'EdgeColor','none') is the desiured result? % Make x-y m...

4 years ago | 0

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From EMG data set, how can I extract 3 signals of 20 second lengths starting at 40, 80 and 120 seconds?
A relatively straightforward way to do this would be to use the buffer function to create a matrix of 20-second samples, and the...

4 years ago | 0

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Hi. I need some help about Spectrograms
I would use the pspectrum function for this with the 'spectrogram' option, since the units and results are easier to interpret. ...

4 years ago | 0

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How to detect flat peaks in a signal
Without the data to experiment with, perhaps using the gradient funciton to help detect the irregularities may be helpful. Th...

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How can I read dat file into table/cell?
The first 16 lines will have to be dealt with separately (this textscan call works to produce a (16x1 ) cell array of them) if t...

4 years ago | 0

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How to use wavelet filters for peak finding ECG data
There are several options depending on what the noise is. The best way to determine that is to take the Fourier transform of th...

4 years ago | 1

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How to find the roots of a polynomial?
There are 4 roots, one of which is 0 and the others are 3-degree polynomials in . syms x t y w sympref('AbbreviateOutput',f...

4 years ago | 0

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How do you determine the arguments to the `buttord` function?
I use the fft function to determine the signal spectrum, and then I use that information to select the frequencies for the filte...

4 years ago | 1

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signal processing - remove unwanted portion from the signal
Try this using envelope to outline the signals, then with a threshold value to choose the desired region — T1 = readtable('htt...

4 years ago | 0

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It is not displaying both plots
Plot ‘f’ as a funciton of ‘x’ — plot(x,f) .

4 years ago | 0

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what is an acceptable values for fval in solver?
That depends entirely on the data and the model. The lsqnonlin function does not return an ‘fval’ output, however it does retur...

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