Star Strider
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14 165 total contributions since 2012Hic 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
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Solution of natural frequency equation with fzero function
The fzero function is likelly not appropriate here. I would instead use fsolve, and convert the obsolete inline call to an anon...
ungefär 6 timmar ago | 0
a problem with power spectrum calculation (FFT)
The mean of ‘data’ is -16657.4418730469. This is the D-C component, so it appears at 0 Hz, and completely prevents the details ...
ungefär 7 timmar ago | 0
| accepted
Comapring Values in one Matrix to another
Another approach: A = [373 383 393 403 413 420 451 485 499]; B = [373 453 457 461 464]; C = ones(numel(B),1)*A; ...
ungefär 9 timmar ago | 0
How to mark the maximum points in mesh
Add this loop just before the mesh call: for k = 1:size(Response_amp,1) [Ramax(k),Idx(k)] = max(Response_amp(k,:)); ...
ungefär 11 timmar ago | 0
plot curve in matlab
syms qa h = (611375/279 - ((192500000*cos(qa))/93 + ((60000*cos(qa))/31 - 611375/93)^2/9 - 14656250/31)/(2*((153125000000*cos(...
ungefär 11 timmar ago | 0
I need to find the angle from horizontal that tangents to a curve make for multiple points
I am not certain what you want to do, or the result you want. The easiest way to calculate numerical derivatives is to use th...
ungefär 24 timmar ago | 0
Interpolation to find harmonics from fft
Consider increasing the frequency resolution by using a longer fft. That may make it easier to detect the harmonics where you e...
en dag ago | 0
Reading Files and plotting in matlab
I am not certain what the responses to the input calls should be, so I did not run your code, only looked at it. It appears ...
en dag ago | 0
| accepted
system of nonlinear equation
That is not going to woork with fsolve for a number of reasons. It is necessary to convert ‘f’ to a numeric (not symbolic) fu...
en dag ago | 0
Variables under the same name in different .mat files
Use load to load each of the files into a different structure. See Load List of Variables into Structure Array. You can then...
en dag ago | 0
Looking for documentation explaining M.' and other symbols to select data from an array
‘M. means the same as M(:,:)‘ No, not ‘M.’. The extra dot will throw an error. I am not certain what you are asking. S...
en dag ago | 0
Creating a vector of datetimes with increments of 15 minutes
Try this: Timestamp = (datetime('2020-06-30 23:45:00') : -minutes(15) : datetime('2015-01-01 00:00:00')).'; Timestamp.Format ...
2 dagar ago | 0
| accepted
simple question of creating a time vector
Without the exact details of your file (that I suspect is not exactly 60 seconds long), something like this will work: t = lin...
2 dagar ago | 0
different sound file times
If you want all of the sound files to have the same sampling frequency, use the Signal Processing Toolbox resample function. On...
2 dagar ago | 0
There is something wrong in R.
The problem is in the way you call the exp function. This works: R = ((2.*h).*(f.^3))./((c.^2).*(exp(h.*f/(k.*T))-1)); .
2 dagar ago | 1
| accepted
Plot AREA limit in matlab
If you want the area between ‘abb_per’ and 100 filled, use the patch function. Try this: figure patch([n fliplr(n)],[abb_p...
2 dagar ago | 0
| accepted
lowpass() not working
A low passband with a very high sampling frequency is asking a lot of any filter. I am somewhat surprised that lowpass used a F...
3 dagar ago | 0
How to plot 3D surface with vector-input function?
The function you coded: FUN = @(x) = x(1).^2+x(2).^2; will only take the first 2 elements of ‘x’ (whatever it is), and will r...
3 dagar ago | 0
| accepted
piecewise for use in anonymous functions
One option: Rt0 = @(theta,theta1,theta2,B,H,L1) ((0<=theta) & (theta<theta1)).*(B./2+L1)./cos(theta) + ((theta1<=theta) & (the...
3 dagar ago | 1
extract mth and m+1st largest element from a vector
‘Is using sort is the best way?’ Yes.
3 dagar ago | 0
How to write a multi line string?
Since ‘tran_models’ is an array, just use a loop: for k = 1:size(tran_models,1) fprintf(File,'%s\n', tran_models(k,:)); ...
3 dagar ago | 0
| accepted
How can I plot and reach to this figure ?
birthday = datenum(year, month, day); t = 0:ceil(datenum(now)-birthday); Physical = sin(2*pi*t/23); The rest would be calcula...
3 dagar ago | 0
Solving the Kinetic equations by Matlab coding
Try this: % % % k(1) = R_Inf, k(2) = k R1fcn = @(k,t) k(1).*(1-exp(-k(2).*t)); R2fcn = @(k,t) k(1).*(1 - (1-exp(-k(2).*t))...
3 dagar ago | 0
Changing scientific notation to long format
Select an appropriate option (such as long g) with the format function.
3 dagar ago | 0
| accepted
Plot fft and peaks on same plot
You did not provide ‘x’ or any of the parameters (such as ‘Fs’) so it is not possible to run your code, and you could easily hav...
3 dagar ago | 0
| accepted
How to repeat the same graph?
Try this: t = 0:40; y = exp(-0.385*t) + 10; y6 = repmat(y, 1, 6); t6 = 0:numel(y6)-1; figure plot(t6, y6) grid produc...
3 dagar ago | 0
| accepted
How to do segmentation on ECG signal for feature extraction
Use the Signal Processing Toolbox buffer function. Calculating ‘n’ is straightforward: n = 10 * 250 producing: n = ...
3 dagar ago | 1
Toolbox of Genetic Programming
Download and install the Global Optimization Toolbox. Simple genetic algorithm code is relatively easy to write. It does not...
3 dagar ago | 0
how to plot 2 curve with together
First, use element-wise multiplication and division: m=0:0.01:50; f= ((7*m - 7*(m.^2 - (226*m)/7 + 15009/49).^(1/2) + 127)...
3 dagar ago | 1
If statement for input value
I would just use a loop: n = input('how many ingredients do you have'); %%FOOD INPUT for k = 1:n a(k) = input(sprintf('...
4 dagar ago | 1
| accepted
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