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Star Strider


Last seen: Today
15 345 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
Obtaining line equation having multiple points
The polyfit (and polyval) functions may be what you want. There are other options, however these are likely the easiest to us...

ungefär 16 timmar ago | 0

Answered
how to fix the error ''Conversion to function_handle from double is not possible.'' for the below 3Eq euler matlab code
First, name the variables slightly differently from the function names, second define the initial conditions to conform with tho...

ungefär 19 timmar ago | 1

Answered
how to color in between curves the two graphs?
It’s not possible to run images of code, especially images of incomplete code. Try this example: x1 = linspace(-0.1, -10, 3...

ungefär 20 timmar ago | 0

Answered
Show numbers with Grouped Bars
Try this: x = [98 96; 142 52; 42 42]; hBar = bar(x); for k1 = 1:size(x,2) ctr(k1,:) = bsxfun(@plus, 1:numel(hBar(k1).XD...

en dag ago | 0

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Answered
How to fit this curve?
The best model is the mathematical expression of the process that created those data. A power law fit appears to provide a re...

en dag ago | 1

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Answered
Import text files with extensions other than .txt
Use detectImportOptions to tell readtable to read the file as a text file. One recent example from an earlier Answer: opts ...

en dag ago | 1

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Answered
± use in MATLAB
One option: CL = [(0.331+0.008) + (0.15+0.002)*ALPHA (0.331-0.008) + (0.15-0.002)*ALPHA]; Experiment to get differen...

en dag ago | 0

Answered
when i plot my figure doesnt show line
Use a colon to create the vectors instead of a semicolon, and be sure the vectors are equal length: x = 1:5; y = 5:9; plot...

en dag ago | 0

Answered
How to create a Symbolic vector
Try this:: n = inputdlg('Enter the length of the vector (integer): '); n = str2double(n); syms x x = sym('x',[1 n]) pro...

2 dagar ago | 0

Answered
1D interpolation by y = ax+b
To set the start point at the origin (0,0), calculate the slope as: slope = x(:) \ y(:); for example: x = 0:0.1:10; y = ra...

2 dagar ago | 0

Answered
A little question of [] and for loop
The full code should actually be: A = []; for i=1:50 A=[A i]; end It works by concatenating the value of ‘i’ to existi...

2 dagar ago | 1

Answered
Plot surface from non-anonymus function
See if this does what you want — function z = test(w) x = w{1}; y = w{2}; z = 2*x.^2 + 2*y.^2 +10*(1.1*y.^2 +...

2 dagar ago | 0

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Answered
Find distance between one point and a subset of other points.
See if the pdist function will do what you want. (If so, squareform may also be useful.)

3 dagar ago | 0

Answered
detrending timeseries by removing the linear function fitted by samples?
Considering that the objective is to remove a linear trend, perhaps the easiest way would be: t = 11:22; p = polyfit(x(t),tac...

3 dagar ago | 0

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Answered
Find peak and plot graph from peak
I am not certain what you want to do. If you want to get the peaks and their indices, request those outputs: [pks,locs] = f...

3 dagar ago | 0

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Answered
How can I define a gradient function that can update k values after each iteration to optimize parameters in ODEs?
One option is the approach in Parameter Estimation for a System of Differential Equations. You will need to modify the ‘kinetic...

3 dagar ago | 0

Answered
How to draw bar graph of different colors ?
Try this: y = [280 260 240]; figure c = bar(y); set(gca, 'XTickLabel',{'CS0','CS10','CS20'}) xlabel('Wt% of cenospheres'...

3 dagar ago | 1

| accepted

Answered
Problem to get the right format of a Surf Plot
It looks as though ‘X’ is not sorted. Without the data a guess would be this possible solution: BB = sortrows (BB,1); See th...

3 dagar ago | 0

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Answered
How to linearly fit a semilog graph
Try this: D1 = readmatrix('Data.xlsx'); x = D1(:,1); y = D1(:,2); [ymax,idx] = max(y); idxrng = idx:numel(y); objfcn ...

3 dagar ago | 0

Answered
I don't understand why the elements are not the same on both sides
The reason is that ‘t’ needs a subscript: x(n+1) = x(n) + h * ((8*(x(n))/(t(n)+1))-(t+1)*(x(n)^2)); ...

3 dagar ago | 0

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Answered
Adding a new column to a table
One approach: T1 = table(randi([330 470],10,1), 'VariableNames',{'QTcorrected'}); % Create Data QTc = @(x) 1*...

4 dagar ago | 0

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Answered
How to Segment EMG data into time intervals
One option is the Signal Processing Toolbox buffer function. It uses samples as one of its arguments, however that is straigh...

4 dagar ago | 0

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Answered
Coupled rate ODEs with ode45
The concentrations change appropriately, however they don’t change much and the concentrations are vanishingly small. That’s th...

5 dagar ago | 0

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Answered
Figure line won't connect/display all data points
Isolated points only plot if specified as markers. Try this: D1 = load('midpoint.mat'); midpoint = D1.midpoint_overlap_seq...

5 dagar ago | 0

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Answered
How to solve this equation?
Probably the easiest approach: syms h z2 Eqn = h^0.66+0.0805*h == 0.045; [h,prms,cndx] = solve(Eqn,h, 'ReturnConditions',1)...

5 dagar ago | 0

Answered
ode45: use span of length 2
The tspan argument can be anything you want it to be (within limits). To have ode45 to evaluate and output at only those valu...

5 dagar ago | 0

Answered
confusing error message: 'Not enough input arguments'?
With a function in that format, it is necessary to pass a function handle to lsqnonlin (or any other function that takes a funct...

5 dagar ago | 0

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Answered
How to plot only the real solutions of an implicit function ?
Nothing is being generated: R = 0.35; L = 0.25; H = 0.4; f1 = @(x,y) sqrt(L^2-(R*(cosd(x)-sind(x).*sind(y))-H).^2); figu...

6 dagar ago | 1

Answered
Plot and calculate Damping ratio
The findpeaks or islocalmax functions can return the information to do the calculations.

6 dagar ago | 1

Answered
Trouble taking the differential of a function
‘What am I missing here?’ Most likely, using the Symbolic Math Toolbox. Try this: syms E I L w_0 x func(x) = (((w_0*L)...

6 dagar ago | 0

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