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Star Strider


Last seen: Today
15.160 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
help with row vector
See the documentation on linspace.

43 minutos ago | 0

Answered
smoothed scatter plot matlab like excel
I have no idea what you want. Try this: X = [6;10;13;23]; Y = [3.78E-04;1.06E-03;1.78E-03;2.10E-03]; Xi = linspace(min(X)...

alrededor de 5 horas ago | 0

Answered
How to extract -3 dB diameter from Matrix?
I am not quite certain what you are doing, especially since contour usually requires 1 matrix or 3 arguments (the first 2 can be...

alrededor de 7 horas ago | 0

Answered
whats wrong with my code??
Yoiu need to do element-wise operationsn (using the dot operator): v=((m.*g)-(m.*a))./k See Array vs. Matrix Operations for d...

alrededor de 7 horas ago | 0

Answered
how to display on increment 0.5 for time
Change this: for t=0:0.001:10 to: for t=0:0.5:10 That is the only line that defines ‘t’ that I can see, so that one change...

alrededor de 13 horas ago | 0

| accepted

Answered
solving system of equations
This runs without error (after several changes): V = 2435 ; k = 1.076 ; Kn = 0.27 ; k=1.076; Y=0.39; kd=0.04; bs=0.15;...

alrededor de 13 horas ago | 0

Answered
How to solve Ordinary Differential Equations with Sin(wt) ?
I replaced ‘i’ with ‘c’ to avoid problems with imaginary operators: syms c(t) w t i0 Eqn = 10*sin(w*t) == 0.001*diff(c) + 100...

alrededor de 23 horas ago | 0

Answered
how to solve 5 equations with 5 unknowns.
Use the Symbolic Math Toolbox: syms T x r k K_c Eq1 = T==300+200*x Eq2 = -r==0.1*k*(1-x-(x/K_c)) Eq3 = 2500==x/(-r) Eq4 =...

1 día ago | 0

| accepted

Answered
Adding two strings same row size
To use the join function, your data must first be present as table objects. Fortunately, that is not necessary. Just use arr...

1 día ago | 0

Answered
Problem with time code - function definition not permitted in this context
I have no idea what the rest of your script looks like, since it was not posted. See the documentation on Create Functions in...

1 día ago | 0

Answered
Contour Plot of Rosie Function
Transpose ‘f’, since ‘x1’ and ‘x2’ appear to be the same (otherwise it would also be necessary to reverse their orders in the ar...

1 día ago | 0

Answered
Plotting a fourier transform graph
Try this: syms t w f(t)=t*rectangularPulse(t/2); F(w)=fourier(f,t,w); figure fplot(real(F), [-50 50]) hold on fplo...

1 día ago | 1

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Answered
How to add Labels to Files saving as .txt
Create the columns as a table, then add the column names as variable names. Use writetable to save it as a file.

1 día ago | 0

Answered
multiple graph plotting error
See: multiple graphs plotting error

1 día ago | 0

| accepted

Answered
multiple graphs plotting error
The ‘t’ vector for the first series of curves is: t=0:0.1:100; and for the second: t=0:0.1:2000; That likely explains th...

1 día ago | 0

| accepted

Answered
Combining Two Plots into One Won't Work!
Not trivial, however also not difficult. F{1} = openfig('f1.fig'); F{2} = openfig('f2.fig'); figure hold on for k1 = 1:...

2 días ago | 0

| accepted

Answered
Excluding folders from a dir Structure
Try this: valid_filenames = cellfun(@isfile,{d.name}); % Eliminate ‘.’, ‘..’ dnew = d(valid_filena...

2 días ago | 0

Answered
Intersection point between two graphs
See if the approach in Help finding intersecting points will do what you want.

2 días ago | 0

Answered
Code for calculating heart rate in Matlab
Using what data? For an EKG, use findpeaks to find the R-deflections, then make appropriate use of the ‘locs’ output to calcu...

2 días ago | 0

Answered
Reformatting columns and rows of a table
Perhaps stack? Otherwise unstack? (Not clear on the result you want.)

2 días ago | 0

| accepted

Answered
LowPass filter order in Signal processing
The signalAnalyzer App is likely not going to be able to do what you want, since it analyzes the signal without designing any f...

2 días ago | 0

Answered
How can be obtain Power Spectral Density using FFT for foetal heart rate signal?
If you have the Signal Processing Toolbox, see the documentation section on Power Spectral Density Estimates Using FFT . Note...

2 días ago | 0

Answered
How to perform a zoom FFT on certain portion of a signal
First, see if the pspectrum funciton using the 'spectrogram' option will do what you want. It will segment the Fourier transfor...

2 días ago | 0

Answered
Help finding intersecting points
Try this: W = 73000; %Airplane weight in lbs Alt = 30000; %altitude given at 30000 feet S = 950; %Area of the wing given in ...

3 días ago | 1

| accepted

Answered
how to remove/reduce power line noise from a short signal?
‘... the sampling rate I have is 19200 Hz but the data is cut in epochs of 480 samples(non continous) and as such makes the freq...

3 días ago | 0

Answered
Locating global max in 3D plot
Try this: [maxval,Idx] = max(Pmusic(:)); [PmusicmaxRow,PmusicmaxCol] = ind2sub(size(Pmusic), Idx); I obviously cannot test t...

3 días ago | 0

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Answered
Optimization of system ODE
See the documentation section on Optimizing a Simulation or Ordinary Differential Equation

4 días ago | 0

Answered
Filter Z Transform Implementation
The easiest way is to let the Control System Toolbox do the initial analysis: z = tf('z'); ...

4 días ago | 0

| accepted

Answered
'fix' function misbehaving
Temporarily set the format to long, and then also do: dZ = Z - 955 and check the result. This is most likely the result of r...

4 días ago | 1

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Answered
Finding the position of specific value in a vector without knowing the exact number
The find documentation section Last Several Nonzero Elements will let you return the indices of only some of the elements. You ...

4 días ago | 0

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