Community Profile

# Star Strider

##### Last seen: Today
15.152 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.

View details...

Contributions in
View by

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...

circa un'ora ago | 0

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...

circa un'ora ago | 0

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...

circa 3 ore ago | 0

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...

circa 5 ore ago | 1

| accepted

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.

circa 7 ore ago | 0

multiple graph plotting error
See: multiple graphs plotting error

circa 9 ore ago | 0

| accepted

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...

circa 10 ore ago | 0

| accepted

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:...

1 giorno ago | 0

| accepted

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

1 giorno ago | 0

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

1 giorno ago | 0

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...

1 giorno ago | 0

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

1 giorno ago | 0

| accepted

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...

1 giorno ago | 0

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...

1 giorno ago | 0

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...

1 giorno ago | 0

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 ...

2 giorni ago | 1

| accepted

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...

2 giorni ago | 0

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

2 giorni ago | 0

| accepted

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

2 giorni ago | 0

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

2 giorni ago | 0

| accepted

'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...

3 giorni ago | 1

| accepted

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 ...

3 giorni ago | 0

Plotting multiple Magnitudes in one plot
Put the figure call before the loop, and remove the subplot call: figure hold on for i= 1:1:23 [u,o] = butter(1,[2*100/...

3 giorni ago | 0

| accepted

Low pass filter VS high pass filter
Calculate the Fourier transform of the filter from the signals. t = ...; %...

3 giorni ago | 0

| accepted

How to plot 2D graph
If I understand correctly what you want to do, this should work: for t=1:20 for x=1:20 Sum=0; for n=1:1...

4 giorni ago | 1

| accepted

All fixed points of function
If by ‘fixed points’ you intend ‘roots’, try this: f = @(x) cos(x) - 0.07 * x.^2; tv = linspace(-10, 10); fv = f(tv); zvi...

4 giorni ago | 0

Interp2/Scatterinterp unstructured Data don't work!
Use the griddata function instead. Try this: Xm = load('X.mat'); X = Xm.Mecanical_Speed; Ym = load('Y.mat'); Y = Ym.Torq...

4 giorni ago | 0

| accepted

How to write name inside polygon?
Use the text function. Try this: pgon = polyshape([1 3 5 7],[2 6 4 1]); [xc,yc] = centroid(pgon); figure plot(pgon) a...

4 giorni ago | 1

| accepted

How do I fix this code? It says "Conversion to function_handle is not possible" on the line f(×) = (x^4) - (10*x^3) + 5
First, fix the typographical errors. Remember that MATLAB is case-sensitive. Second, see the documentation section on Anonymo...

4 giorni ago | 0