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Star Strider


Last seen: Today Active since 2012

Hic sunt dracones! PROFESSIONAL: Physician (M.D.): Diplomate of the American Board of Internal Medicine; M.Sc. Biomedical Engineering: Instrumentation, Signal Processing, Control, System Identification, Parameter Estimation NON-PROFESSIONAL: Amateur Extra Class Amateur Radio Operator; Private Pilot, Airplane Single Engine Land, Instrument Rating Airplane; Gamer NOTE: I do not respond to emails or personal messages, unless they are about my File Exchange contributions. Time Zone: UTC-7 (Standard); UTC-6 (Daylight Savings/Summer)

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Answered
How to parameterize function.
Try something like this — syms t x y z P{1} = x^2 +2*y +3*z; P{2} = x*y -2*z^2; P = subs(P,{x,y,z},{t,t,t}) See the docu...

14 hours ago | 0

Answered
How to match cell arrays according to their sample ID?
Try something like this — %% Create sample data A= {'Sample ID', 'Value'; 1, 1050; 2,1133; 3,1001; 4,1200}; B= {'Sample ID',...

15 hours ago | 1

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Answered
Resampling matrices in a loop using interp2
I am not certain what hte problem is, since the error messagd is not part of the provided information. I suspect the problem ...

15 hours ago | 0

Answered
overwrite figure(2) on figure(1)
I am not certain what you are asking. Consider using the hold function to plot two figures on the same axes — syms x f = si...

1 day ago | 0

Answered
Plot graph using dots and colormap to show the frequency
It is ceretainly possible to scale any of the axes logarithmically, providing that none of the plotted values or axes values are...

1 day ago | 0

Answered
retime Linear or next
Try something like this — Time = datetime('now')+hours(0:2).'; Temperature = 10*randn(size(Time)); T2 = table(Time,Temperatu...

1 day ago | 0

Answered
I have a raw eeg data and i want to plot the alpha wave(8-12Hz) of this data in the same window . How can i do? please help me
Design a bandpass filter (using bandpass or other appropriate function), filter the signal, and plot it — Fs = 1000; L = 1E+...

1 day ago | 1

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Answered
Why do I get "Array indices must be positive integers or logical values" error when using "angle" function?
You have a variable named ‘angle’ somewhere in your workspace. If you run: which angle -all the results should be similar to...

1 day ago | 0

Answered
Finding similar elements in a single matrix
One approach using accumarray — x = [2 0 0 3 3 0 4 4 0 5 5 5 6 6 6]; [Aunique,~,idx] = unique(x(:))...

2 days ago | 0

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Answered
How to Stop FOR loop when "answer" is reached, and display answer?
See the documentation on the break function.

2 days ago | 0

Answered
Excel column informtion input
I would use readtable to read the file, then addvars to add one or more variables in the desired position, then writetable to wr...

2 days ago | 0

Answered
Genetic Algorithm not returning best found solution
I do not entirely understand what your ‘obj_fun’ fitness function optimises, however expecting ga to optimise 37 parameters in 2...

2 days ago | 0

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Answered
how to read .txt file having the following format.
Use the readcell function — C1 = readcell('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1214888/example.txt'...

3 days ago | 0

Answered
how to save anovan figure as a .fig?
It is likely not possible to save the image, however anovan creates a table with the same information if you request it, and it ...

3 days ago | 0

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Answered
how to plot 3D figure like this?
Try something like this — Fs = 250; L = 100; f = 1.26; t = linspace(0, L-1, L)/Fs; s = sin([0 (1:2:20)].'*2*pi*t*f)./[1 (1...

4 days ago | 0

Answered
Representing samples on analog signal according to the sample period (MATLAB)
The easiest way to create the time vector is: t = linspace(0, L-1, L)/Fe; Example — LD = load('handel.mat'); y = LD.y; F...

4 days ago | 0

Answered
Plot Day of Year with Time
Try something like this — T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1213723/Data_2.csv') ...

4 days ago | 0

Answered
defining state matrix as anonymous function
Referring to your other post: ode45 is running an infinite loop (it isn’t actually, since switching from ode45 to ode15s solves ...

4 days ago | 0

Answered
How to make a line of fixed length?
It is relatively straightforward to write an anonymous function for this — createLine = @(startpt, slope, len) [startpt(1) sta...

5 days ago | 0

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Answered
How to find and fit the objective function for a damped oscillation?
Using fminsearch — T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1211598/F300.xlsx') x = T1....

5 days ago | 1

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Answered
Getting "Arrays have incompatible sizes for this operation." on this exercise
The ‘z’ assignment fails because the arrays used to calculate it are empty, likely because the first 50 elements of ‘n’ are less...

6 days ago | 0

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Answered
Unrecognized function or variable 'wgs2utm'
Search the File Exchange for wgs2utm.

6 days ago | 0

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Answered
Can I find likelihood function of an objective function?
If you have the Statistics and Machine Learning Toolbox, see if the mle function (and associated functions) will do what you wan...

6 days ago | 0

Answered
How to make contour plot of two matrices in MATLAB?
‘Data files both are matrices with 1 row and 55 columns, which represent 55 points.’ They are vectors by definition, and it i...

6 days ago | 1

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Answered
Broad confidence bound range when fitting in Matlab
The important thing to note here is that the confidence intervals for ‘n’, ‘L’ and ‘A’ include zero (have opposite signs) and ...

6 days ago | 1

Answered
add transparency to a contourf
You have to use the handle to the contourf plot to set the transparency — [X,Y,Z] = peaks(50); figure contourf(X, Y, Z) ...

7 days ago | 0

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Answered
How to find the frequency of a morse code (sinusoidal signal) mixed with an audio music signal from a .wav file?
Start with the pspectrum function to analyse the signal, using the 'spectrogram' option, or just use fft, although if the Morse ...

7 days ago | 0

Answered
how to make an audio
I would use a Gaussian for the envelope function, similar to: envfcn = @(ct,sf,t) exp(-(t-ct).^2*sf); where ‘t’ is the time v...

7 days ago | 0

Answered
Need to print the output to newline while creating a table
In the loop, subscript the different assignments, for example: Var1(j,:) = type(j); Var2(j,:) = dx(j); and so for the rest. ...

7 days ago | 1

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Answered
Converting Y-axis values to the base of 10
This can be done easily using ytickformat (introduced in R2016b) — x = linspace(0, 2.5); y = 6*exp(-1.5*x) - 6; figure pl...

7 days ago | 0

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