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Star Strider


Last seen: Today
14,404 total contributions 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.

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Answered
Parameter Estimation for a System of Differential Equations
Using this version of ‘kinetics’ (that also estimates the initial conditions for ‘DifEq’), function C=kinetics(k,t) c0=k(5:8)...

1 hour ago | 0

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Convert Data from array
I am not certain what your data are, or what you want to do. One option for reducing the size of the array and still getting ...

3 hours ago | 0

Answered
Can't get simple for loop to run
You may be encountering ‘floating-point approximation errror’. See Floating-Point Numbers for a description of them and how the...

3 hours ago | 0

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How to find out lag between two signals ?
One option is the finddelay function. There are related functions linked to in and at the end of that documentation page.

4 hours ago | 0

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Matlab Function from code
See the documentation on Function Basics.

4 hours ago | 0

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Index in position 2 is invalid. Array indices must be positive integers or logical values.
My guess is that the problem is using ‘Y(iter)’ and ‘K(ik)’ as indices in that assignment. They may not be integers greater tha...

14 hours ago | 1

Answered
Accessing values in a Cell Array using Index Values stored in another array
That requires a bit of cell array gymnastics: NewVector = [1.5 1.5 2.1 2.2 2.2 2.2 2.2 0.9 0.8 2.4 2.3 2.8 2.4 2.9 3.1]; New...

14 hours ago | 0

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How to reshape an array horizontally
Using the reshape function: text1 = ['words'; 'words'; 'words'] text2 = reshape(text1', 1, []) producing: text1 = 3×5...

14 hours ago | 2

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Answered
Unable to perform assignment because the left and right sides have a different number of elements.
Subscript the vectors in the loop that calculates the new values: for i=1:nIterations-1 S(i+1)= S(i)-dt.*(h.*S(i)+rho.*I(...

19 hours ago | 2

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Answered
How to plot a values inside a while loop .
The easiest way is to store the intermediate results, then plot them at the end: while t<176400 H=3600; fprintf('\t\...

19 hours ago | 0

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taking samples from a vector
Try these: D = load('psi.mat'); psi = D.psi; % (10962 x 1) Every5 = psi(1:5:end); ...

20 hours ago | 0

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Answered
String to Datenum Format using opts and Setvaropts
Try reading those in as strings, then doing the conversion later: t = repmat('20200721T145002Z', 5, 1); ...

20 hours ago | 0

Answered
specifying the horizontal linetype '_' produces an error.
Function arguments in MATLAB are positional, so it is necessary to provide values for the interventing arguments to use later ar...

21 hours ago | 0

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Shade the region above the graph
Try this: % Maximum speed rho = 0.002378; % at sea level Vmax = 987.48; K = 0.0397887; rho30 = 0.00089; rhos = 0.374; % ...

22 hours ago | 0

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How do I filter out unwanted frequencies from an audio file?
It would appear that the ‘mirror image’ refers to the complex double-sided Fourier transform. In addition to fft, you will li...

23 hours ago | 0

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Answered
More than one frequencies
Multiply the two tones (modulate the 440 Hz with the 400 Hz) to get the ‘beat’ effect you want: sound(s, Fs) ...

1 day ago | 0

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Answered
Butterworth filter without the 's' option
For analog filter designs (the ‘s’ option), use the freqs function. For discrete filter designs (without the ‘s’ option), use f...

1 day ago | 0

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How to graph a function with a parameter that changes with time.
It is straightforward to define and calculate the result of ‘y’ while varying both ‘t’ and ‘x’ at the same time, using matrix ar...

2 days ago | 0

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Answered
How to scale an axis on a plot in powers of 10?
Set xlim to the limits you want. Example — x = logspace(5, 6, 25); % Create Data y = rand(size(x)...

2 days ago | 0

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Answered
ODE solvers - passing parameters
It is actually a bit more involved than simply passing parameters when you are using the function with any of the ODE solvers (o...

2 days ago | 0

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How can I to convert a cell to a double without losing the leading zeros?
Thank you for quoting my code from Extracting numbers from mixed string ! It is not possible to retain leading zeros in a num...

2 days ago | 0

Answered
Extracting numbers from mixed string
Another approach: str = 'preci_CZ_02000_20200101_0000.txt'; out = regexp(str, '(?:\d{4})\>','match'); producing: out = ...

3 days ago | 0

Answered
How can I plot two datasets together if they have different x axis values?
The ‘data.mat’ file contains data for only one day as datenum values, that apparently are all for 01-Jan-2020. One approach: ...

3 days ago | 0

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Answered
Highlight Specific Portion of Graph
I am not ccertain what you want to highlight, since that region is vanishingly small. Try this: %Emissive Power wl=10e-2:0...

3 days ago | 0

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Answered
I want to sketch the parametric euqations lies on the cone, but the cone is so small and the lines are sparser than it should be.
Scale the size of the cone up by multiplying its variables with some appropriate constant (that I call a ‘Magnification Factor’ ...

3 days ago | 0

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Answered
Getting a function I downloaded online to run
First, use dir on the folder to be certain it actually appears there. Second, see what: which('intpartition.m') returns. ...

3 days ago | 0

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How to apply bandpass filter to a single data type?
Yes. You can use single. See the documentation section for x . This specifically refers to the Signal Processing Toolbox b...

3 days ago | 0

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Answered
glmfit not working: US's chances of recession
Use glmval to evaluate the result of the fit: T1 = readtable('USREC.xls'); ind = T1.ind; us2y10 = T1.us2y10; rec = T1.rec; ...

4 days ago | 0

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Answered
How can I get peaks values and distance between them indicated in the figure?
The findpeaks function could possible do what you want.

4 days ago | 0

Answered
Why won't this plot?
The problem are the y-axis limits in the axis call. Comment-out the axis call (as I do here) and you will immediately see the...

4 days ago | 0

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