Community Profile # 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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My code is keep plotting the wrong data
Perhaps — TEST = randn(150,9); M = TEST(:,[8 9 2]); x = M(:,1); y = M(:,2); z = M(:,3); L = size(M,1); xv = linspace(mi...

33 minutos ago | 1

Fitting a straight line to a specific region of the graph
I suspect the problem is in using‘T’ as a subscript, since subscript values must be integers greater than 0 or logical values. ...

alrededor de 1 hora ago | 0

Fft graphs exhibit symmetry on the x axis, but not around 0
It appears that you are plotting part of a two-sided Fourier transform. I generally use this approach to plot a one-sided Fou...

alrededor de 18 horas ago | 0

Finding all possible zeros for a function with 2 independent variables.
The contour and fimplicit funcitons are likely best for this. For contour, create a matrix for ‘v’ and ‘n’ using either ndgri...

alrededor de 19 horas ago | 0

i have a vector and i want to convert it in to single cell aray.
I am not certain what result you want. Two options — A = [12 33 44 55 66] B = num2cell(A) B = {A} .

alrededor de 23 horas ago | 0

How can I solve the following error?
Somewhere you have a variable named ‘sum’ and this is throwing the error. The solution is to re-name the variable to somethin...

alrededor de 23 horas ago | 0

Is it possible to create a surface plot from scattered points?

1 día ago | 0

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‘For reference, the code below currently gives that the vertGridSpacing is 59.94 pixels, while the true vertGridSpacing should b...

1 día ago | 0

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how do i read just the header in a csv file and write them into a file

2 días ago | 0

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extract data from one day from a timetable
Try something like this — LD = load('ask_matlab.mat'); TT1 = LD.ans; RT = TT1.Properties.RowTimes; VN = TT1.Properties.Vari...

2 días ago | 0

Unrecognized function or variable 't'.
Just befor the ‘u’ assignment, insert these assignments: tmax = 10; % Maximum Time t...

2 días ago | 0

How to select a certain range in the middle of my data?

2 días ago | 1

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How to take data from multiple variables and store them in one variable?
I am not certain what you want, however one option would be a cell array — v1 = rand(3) v2 = 'This is Variable #2' v3 = exp(...

2 días ago | 0

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to build a table with XYZ values
In order to save them to a file, use the (:) operator or the reshape function to create column vectors from the matrices. Conca...

3 días ago | 0

Interpolating points in a 3D space with one line
Try something like this — rpm = rand(5,1); dosage = rand(5,1)*0.1; mass_of_leaves = rand(5,1); B = [dosage mass_of_leaves...

3 días ago | 0

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How do I plot a curve in MATLAB and see its characteristics response like overshoot, settling time, etc using Voltage vs time graph from excel.
Use readtable or readmatrix to import the data, then use the System Identification Toolbox functions, specifically iddata, ssest...

3 días ago | 0

How to apply moving harmonic average on an array?
If you want to calculate it as described in the harmmean More About section, perhaps something like this would work — movhm = ...

4 días ago | 1

Im trying to plot two functions over a range
There are several missing operators (that I assume should be multiplication operators), and all the applidable operators should ...

4 días ago | 1

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Find the width of a peak

4 días ago | 1

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Plot an equation (sigma operator)
Try soemthing like this — n=3; kv=0:floor(n/2); xv=-2:0.1:2; H = zeros(size(xv)); Hv = zeros(size(xv)); for k2 = 1:numel...

5 días ago | 0

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Solve the system of three equations and three unknowns
Solve the system symbolically, then plug in the various values for , , and to get values for , , and — syms A B C D E x y z ...

6 días ago | 0

Wrong Legend Sign Marker
I am not able to run the code so I cannot test this, however one approach could be: legend([a1(1), a3(1) a4(1)], 'Fiducial Mar...

6 días ago | 1

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Readtable() Skipps last rows of csv
If you are using the unique function before writing the output file, it could be deleting several entries. Also, the correct ap...

6 días ago | 0

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Why 'NaT' (class: datetime) does not work with find function?
Use the isnat function to test for it. .

6 días ago | 0

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My code won't run, error message :Unrecognized function or variable 'ss'. Error in Q4_109 (line 19) Sys=ss(A,B,C,D);
If you are getting an error that MATLAB cannot find the ss function, then you need to license and install the Control System Too...

7 días ago | 1

Very basic question about fir1 command
Probably something like this — t=0:1/500:0.3; n=cos(2*pi*10*t) + sin(2*pi*50*t); Fs = 500; Fn = Fs/2; b = fir1(32, 25/Fn);...

7 días ago | 0

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The Voigt profile appears to be slightly challenging to code. The File Exchange has a number of entries for Voigt.

7 días ago | 0

Plot legend in a bar graph
hFig = figure(1); Month = {'April'; 'May'; 'June'; 'July'; 'August'; 'September'; 'October'; 'November'; 'December';'January'...

7 días ago | 1

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