Star Strider

Last seen: Today | Active 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. Time Zone: UTC-7 (Standard); UTC-6 (Daylight Savings/Summer)

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How would I use fsolve for 3 unknowns and 3 equations?
Provide values for ‘Qt’ and ‘Qm’ and then solve it — clear;clc;format long; lm1=0; %m lm2=-0.2; %m Am=95; %m^2 At=3; %m^...

alrededor de 13 horas ago | 0

Answered
Wilcoxon 'signrank' test zval is not calculating
The ‘zval’ is only returned when the 'method' is 'approximate'. There is no statistical difference between the vectors: [p,...

alrededor de 15 horas ago | 0

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How do I put the patch in the correct position?
It appears that the ‘x’ and ‘y’ axes are reversed with respect to the data and the percentile patches. Keep the percentile patc...

alrededor de 18 horas ago | 0

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Identify Zerocrossing Indices near to the peak of the other signal matlab
The file is too large to download here, and the online Run feature still has problems with .mat files. That aside, finding th...

alrededor de 23 horas ago | 0

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Answered
Internal Matlab function not found (isnan)
Try — rehash toolboxcache .

1 día ago | 1

Answered
Convert from transfer function to time domain
Probably the easiest way is to just simulate it. R0=0.000605797; Qr=147964.8608; R1=0.000856205; C1=0.049823238; % X=[SOC...

1 día ago | 1

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Answered
combining 2 ECG signal into 1
Unless the row vectors ‘xn’ and ‘xaf’ have the same number of elements, the vertical concatenation to produce ‘xc’ is going to f...

1 día ago | 0

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Choosing the Axis for Interp2?
Use plot3 instread of plot, since the plot is in three dimensions — X=-1:0.1:1; Y=-1:0.1:1; Z=membrane(1,10,10); figure(1...

2 días ago | 0

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how to make a cross section of lines and connect cross sections?
I do not have your data, however consider something like this — It would appear that the ‘y’ value is fixed in any specific lo...

3 días ago | 0

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Proper Labeling of X & Y values Contour Plot
Use the tick label properties to change the tick labels. Any new tick values have to be in the ranges of the current tick value...

3 días ago | 0

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how to make a boundary using percentile?
This uses the prctile function — x = rand(1,1000)*10+125; y = randn(1,1000)*50+250; xpctl = prctile(x,[2.5 97.5]) ypctl ...

3 días ago | 0

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Is there a function to make a long list of a single value?
Try this — Fives = 5*ones(400,1) .

4 días ago | 1

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Understanding this FFT Graph
‘My question is; what would the label be for the Y-axis and secondly, is the X axis just frequency in the time domain?’ The Y...

4 días ago | 0

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FFT Analysis of Sine Sweep
Your posted code is likely as good as it is possible to get. I added a pspectrum call at the end — T=5; %size of window fs...

5 días ago | 0

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Time response of modes to an impulse
If I understand correctly what you want, it is possible to return the state trajectories with lsim as described in Extract Simul...

5 días ago | 0

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Reading complicated CSV file
Try something like this — C1 = readcell('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1007390/random.csv'); ...

6 días ago | 1

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Answered
How to solve a nonlinear system with 6 equations but with only 4 variables?
Use the mldivide, \ operator to do a least-squares determineation of the system. See the documentation for details. .

6 días ago | 0

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Problem with cycle within a cycle output
If I understand correctly what you want to do, in every ‘j’ iteration, ‘h’ needs to be reinitialised, so: h = 1; whil...

6 días ago | 0

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Precise Prediction Model Development
What are you predicting? How does ‘y’ fit in with this? Is it a separate vector? With those concerns met, building the ...

6 días ago | 0

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Answered
How to filter noise in EMG signal - Tibialis anterior muscles
First, before calculating the fft, subtract the mean of the signal to eliminate the D-C (0 Hz) spike so the other peaks are more...

6 días ago | 0

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How to match the rising starting point of the graph
This is my best effort. I could not get the other functions I tried (ischange, findchangepts, islocalmin, etc.) to work, so I w...

7 días ago | 2

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Answered
I exported data from excel into a table, how do I sum the values of each column from that table excluding NaN's
Two options — T = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1005700/Inventory.xlsx') S1 = nan...

8 días ago | 0

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How to overcome the problem with the function diff used to approximate matrix derivative.
Use the gradient function instead of diff.

8 días ago | 0

Answered
How to interpolate a column array based on another non-linearly spaced column array?
As a general rule, it is best to interpolate a longer vector to a shorter vector in order to avoid creating data that interpolat...

8 días ago | 0

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Incorrect use of '=' operator for an IF statement
I usually do something like this in setting an index range — L = numel(Componentry_New) for k = 1:Whatever Level_Either_...

8 días ago | 0

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Trying to learn how to add a threshold trigger and peak markers.
Try something like this — x = linspace(0,10,500); red_line = sin(2*pi*x)*1.5; trigger = find(diff(sign(red_line - 0.95)));...

8 días ago | 0

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Answered
What does this Digital filter actually do? and what is it called?
It is a 2D FIR filter: I am not certain it has any other name. To see what it does, plot its results — H = [1 1 1 1 1;1 2...

9 días ago | 0

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Answered
How to add date and time in a plot by command in matlab 2012?
I no longer have access to R2012a, so I cannot test this with it. The code you posted works correctly in R2022a, however R201...

9 días ago | 0

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Answered
Three columns (x,y,z) in table, Loop through table for each X plot Y vs Z
Try this — CA = {'A' 1 3 'A' 2 4 'A' 3 10 'B' 1 4 'B' 2 4 'B' 4 6 'C' 0 1 'C' 1 4 ...

9 días ago | 0

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Answered
How to implement a for loop on figure plotting?
Try something like this f = 1:500; Q = randn(115,500); idx = 1:100; % Choose Specific Columns fi...

9 días ago | 0

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