Answered
How to convert fprintf from single row to multiple rows?
There is not enough of the code provided to know what the problem is (and images of code are never appropriate, since actual cod...

4 years ago | 0

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Answered
How to copy a matrix but skipping some row and column?
A = randi(99,24) skiprc = [1, 2,4, 6, 8, 17, 19]; copyrc = setdiff(1:24, skiprc) B = A(copyrc, copyrc) As requested! ...

4 years ago | 0

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Answered
Sum of rows based on time range
Try something like this — T1 = table(datetime('now') + days(sort(randperm(150, 20)))', randi(99,20,1), 'VariableNames',{'Time'...

4 years ago | 0

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Conversion of cumulate day of the year and year into Date/Month/Year
The datetime function is remarkably robust (more so that I previously appreciated)! Try this — D = datetime(1970,1,344) Ch...

4 years ago | 0

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3d plot plotting in 2d and 2d plot plotting in 3d.
The must both plot in 3D, however the ‘z’ value of the 2D plot can be whatever you want (here, 10) — x = 0:0.5:5; y = 0:0.2:2...

4 years ago | 0

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How can I change hisfit curve into 2d gaussian contour plot?
I am not certain what you want. Try this — D = readmatrix('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1...

4 years ago | 0

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Answered
How to detect outliers in the graph
Either use findpeaks on the negative of the ‘y’ vector to get the indices of the valleys, or use islocalmin to get a logical vec...

4 years ago | 0

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Rate of Change - Derivative of experimental data
I usually do something like this — dydx = gradient(y) ./ gradient(x); This assumes the independent variable ‘x’ and the depen...

4 years ago | 0

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How to set proper configuration to obtain peaks of my data
It would help to have some representative data. However, since the data are resonances, and the desired result seems to indic...

4 years ago | 0

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Answered
Ho to find the interception
If you simply want to do it yourself, try something like this — xData = 1:150; yData = 50*exp(-(xData-75).^2 * 0.01) + randn(...

4 years ago | 0

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Answered
Delete rows in a string array, if they just contain zeros
It would help to have the data you are working with. With respect to troubleshooting — First, see what the logical statemen...

4 years ago | 0

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Plotting a 3D millstone with surfaces
I am not certain what you want. Try something like this — [X1,Y1,Z1] = cylinder(0.2,50); [X2,Y2,Z2] = cylinder(1.0,50); Z...

4 years ago | 0

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Answered
Extracting data from Matlab .fig with 2 different y-axes?
Try something like this — x = linspace(0, 10); y1 = sin(2*pi*x/max(x)); y2 = exp(-0.2*x) .* cos(3*pi*x/max(x)); figure ...

4 years ago | 1

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Answered
Remove noise from time series data
The sgolayfilt function might be a better option. Try something like this — FrameLen = 201; DataFilt = sgolayfilt(data1, 3...

4 years ago | 0

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Answered
How could I program a "for loop" in Matlab to calculate the function's minimum value?
G = @(x,b) x.^2-b.*x+1; b=1:1:5; for k = 1:numel(b) xv(k) = fminsearch(@(x)G(x,b(k)), rand); end xv The first der...

4 years ago | 1

Answered
Can somebody help me how can I draw a hemisphere with flat top?
One approach — [X,Y,Z] = sphere(20); figure surf(X, Y, Z) axis('equal') grid on title('Original Sphere') Top = 0.85;...

4 years ago | 0

Answered
I have a matrix 592*2 from this I got a curve, now I need to calculate full width half maximum , how to do it?
There are several ways to do this, the easiest being the findpeaks function — B = readmatrix('B_mtx 2022 06 22.txt'); [pkd,lo...

4 years ago | 1

Answered
How to add a reference line power law of 1?
The power equation is , so choose independent variable , slope , and intercept and go from there — pwr_y = @(x,m,b) x.^m .* e...

4 years ago | 0

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Answered
How to do get my code to display an answer using f print f. I want to display the result using fprint f
Perhaps this — t_sec=[0 30 60 150 240]; Temp_C=[800 457 269 79 46]; time=0:1:250; pa=polyfit(t_sec,Temp_C,4); Pa=polyval(p...

4 years ago | 1

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Answered
Symbolic rewritten in matlab
An analytic solution is likely not possible, due to the nature of the expression. The only option is to solve it numerically ...

4 years ago | 0

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Answered
How to downsample a signal
Any resampling is not necessary. Just use the lowpass function to filter out everything above 8 kHz. (Use 'ImpulseResponse','i...

4 years ago | 1

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Answered
What is the x-axis in fft() command?
The x-axis will be frequency, that being defined as cycles/(time unit of the original independent varialble). If that is in sec...

4 years ago | 1

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Answered
Labelling colourbar using Latex
Try this — x = linspace(-3, 3, 50); [X,Y] = ndgrid(x); Z = exp(-(X.^2+Y.^2)); figure surf(X, Y, Z) grid on hcb = color...

4 years ago | 0

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Answered
Import data into datetime format
It would help to have the file and the MATLAB release you are using. It would be better to use readtable if you have it. Also,...

4 years ago | 0

Answered
How to calculate the FWHM from multiple spectra?
It might be easier if we had one or two typical .csv files to experiment with. The findpeaks WidthReference option is 'halfp...

4 years ago | 1

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Answered
Designing Filter for Accelerometer
The data are not regularly-sampled, so in order to do any meaningful signal processing on them, they need to be resampled to a c...

4 years ago | 0

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Is it possible to find the index of an array based on the Xline?
I’n not exactly certain what you want, however this is relatively straightforward using the find function, and getting the inter...

4 years ago | 0

Answered
Error Index in position 2 exceeds array bounds
I don’t have ‘input_file’ however according to this lilne: data1 = textread(input_file,'%s'); the ‘data1’ variable is a colum...

4 years ago | 0

Answered
Why is my function not graphing in the plot?
Two problems: First, you need to do element-wise division: g = (sqrt(R.^2 * x.^2 * C.^2))./(sqrt(1 + (R.^2 * x.^2 * C.^2))) ...

4 years ago | 1

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Answered
Difficulties having log and linear y axes on same figure
The data are missing so I can’t run the posted code. Try something like this — x = linspace(0,100); y1 = 5.1+5*sin(2*pi*x*...

4 years ago | 2

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