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Star Strider


10,364 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
How do I rotate contour plot?
It would help to know how you calculated your data, and what you’re plotting. Rotating the plot _might_ be as simple as reversi...

1 day ago | 0

Answered
Plotting peaks and troughs of a large oscillating simulation data
One option, if you are using *|findpeaks|*, is to negate it and then plot the negative of the peaks. *_Example_ —* t ...

2 days ago | 1

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Answered
how to open csv and plot contour data
You can probably just use the <https://www.mathworks.com/help/matlab/ref/contour.html *|contour|*> (link) function. *_Examp...

3 days ago | 0

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Answered
How can I solve this Problem?
Use the <https://www.mathworks.com/help/symbolic/isalways.html *|isAlways|*> (link) function.

3 days ago | 0

Answered
Averaging data with slightly different time values
I would use the <https://www.mathworks.com/help/signal/ref/resample.html *|resample|*> (link) function. You can specify a new, ...

3 days ago | 0

Answered
Merge fft data sets
I would take the _ensemble average_, either of the time-domain signals before you take the *|fft|*, or of the individual Fourier...

3 days ago | 0

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Answered
plot doesn`t work (probably unrelated to the code )
For *|‘pulseRC1’|*, you either need to define *|‘a’|*, or give it a range and use the <https://www.mathworks.com/help/symbolic/f...

3 days ago | 0

Answered
Error using sym/cat>checkDimensions (line 70) CAT arguments dimensions not consistent.
I did not troubleshoot *_all_* the errors that might be in your code, only the ones in the *|‘eqs’|* vector. Spaces are importa...

4 days ago | 1

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Answered
"simplify" doesn't work properly
Choosing the correct function is important. Without knowing your _actual_ expression (so I do not know if this is appropriate f...

4 days ago | 1

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Answered
Error using str2sym (line 83) Unable to convert string to symbolic expression: L 1 (C 103): BADCH: Invalid character(s).
You are using the Unicode ‘En Dash’ (decimal *|8211|*, hex *|2013|*) instead of a normal hyphen (decimal *|45|*, hex *|002D|*) f...

4 days ago | 1

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Answered
Undefined function or variable 'retime'
The only thing I can think of is to try running these from a script or the Command Window: restoredefaultpath rehash t...

4 days ago | 0

Answered
how to calculate rms of fluctuation velocity
You can use the <https://www.mathworks.com/help/signal/ref/rms.html *|rms|*> (link) function in the Signal Processing Toolbox. ...

5 days ago | 0

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Answered
How to remove/skip text at beginning of a file while reading it using textscan?
If the text line is a separate line at the beginning of the file (as it appears to be), use the <https://www.mathworks.com/help/...

5 days ago | 1

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Answered
As I want tolve differential eduation in matlab 2018 but its not solving and making matlab busy.
You may have encountered the ‘syms freeze’. Try the steps described in: <https://www.mathworks.com/matlabcentral/answers/41...

5 days ago | 0

Answered
3D stem plot colored by Z-value
This requires a bit more code than I would like, partially because it needs to scale the colors appropriately to match the *|sca...

7 days ago | 2

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Answered
I 2-D plot of y with specific x
I am _guessing_ here as to what you want. Try this: psnr_val=[22 24 29 32 33]; exp_t =[0.01 0.1 1 10 100]; ...

7 days ago | 0

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Answered
visioner code changing string
Letters in MATLAB (and most other languages) are represented by numeric values. Since this is homework, we only give hints, so ...

8 days ago | 0

Answered
Find index of an array that corresponds to a given value
I can only _guess_ as to what the exact problem may be without seeing your data. It could be that what you _believe_ to be the ...

8 days ago | 0

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Answered
Solving simultaneous equations without martix method
You would most likely have to use the Symbolic Math Toolbox: syms x y Eq1 = x + y == 10; Eq2 = x + 2*y == 15; [x...

8 days ago | 0

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Answered
nlinfit function, not enough input arguments
Assuming that *|‘y’|* exists somewhere in your workspace, and since for *|MATLAB|* Statistics and Machine Learning Toolbox and O...

8 days ago | 0

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Answered
Textscan has an error with some file names and not others?
Check the second output *|‘errmsg’|* in your <https://www.mathworks.com/help/matlab/ref/fopen.html *|fopen|*> (link) call. It w...

8 days ago | 0

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Answered
What model would fit a set of values that increase then decrease over time?
Solving for the second compartment in a two-compartment model comes close. Model: [C1] =k1=> [C2] =k3=> [ ] <=k2=...

9 days ago | 1

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Answered
How can I plot the different values in a matrix as different entities in a single plot?
This plots the row- and column-subscripts, each with the appropriate marker and color. *_The Code_ —* M = [1 3 4 4 1 ...

9 days ago | 0

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Answered
How do you find a sinusoidal curve on given data without using curve fit tool box?
See <http://www.mathworks.com/matlabcentral/answers/121579-curve-fitting-to-a-sinusoidal-function *Curve fitting to a sinusoidal...

10 days ago | 0

Answered
Is there any function can compute the value of sgn?
The closest you can lkikely get is the <https://www.mathworks.com/help/fuzzy/sigmf.html *|sigmf|*> (link) function in the Fuzzy ...

11 days ago | 1

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Answered
plot confidence interval of a signal
In order to calculate the *|95%|* confidence intervals of your signal, you first will need to calculate the *|mean| and *|std|* ...

11 days ago | 1

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Answered
Hi!! What is wrong in my code?
First, MATLAB parses matrices differently than you would expect it to, so your original *|‘eqns’|* system is (as MATLAB reads it...

12 days ago | 0

Answered
Display array values side by side
Force *|‘real’|* and *|‘imag’|* to become column vectors first: fprintf(fileID,'%8d\t %8d\n',[real(:), imag(:)]') or ve...

12 days ago | 1

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Answered
I need help for coding or writing Active Appearance Model (AAM) for chest radiography images?
In the column to the right under *‘Entire Website’* are *|3|* links to File Exchange contributions for Active Appearance Models....

12 days ago | 0

Answered
Linear regression model with fitlm
You may have to do a separate *|anova|* call to get it: Anova = anova(correlation); AnovaP = Anova.pValue(2); That w...

12 days ago | 0

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