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Star Strider


11,632 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
Quiver plot arrows hidden by surface plot?
I was considering something like this: x = linspace(-pi, pi, 20); h = x(2)-x(1); [X,Y] = ndgrid(x); Z = sin(X) .* cos(Y); ...

13 hours ago | 0

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Answered
Left and right sides have different number of elements
Both ‘R_e’ and ‘k’ are (1 x 10) vectors, so ‘f’ will also be a (1 x 10) vector. Try this: f(counter,:)=pipe(R_e,k); With t...

17 hours ago | 0

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Answered
Linear Regression Code Formula
The polyfit function creates a least-squares fit of the data to a polynomial, given the independent and dependent variable data,...

18 hours ago | 0

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Answered
how to generate a vector of zeros with 2 random successives cell containing ones
I have no idea what you want. Try this: z = zeros(1, 20); % Vector Of 20 Zeros idx = randi(n...

18 hours ago | 0

Answered
Remove or hide the special Y-axis label
Change your axis call to: axis([0 8 0.94 1]) That should do what you want.

22 hours ago | 0

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Answered
Parameter estimation in ODE
You are trying to fit 5 columns of your differential equation to 4 columns of data. That will throw the error you got. Chang...

1 day ago | 0

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Answered
How to remove NaN values from an array
Since you want the lines to be continuous, consider using the fillmissing (link) function to fill in the NaN values with numbers...

1 day ago | 0

Answered
How do I output to the command window where the sum of the bars on the graph equal zero along the x axis
If fyou are referring to ‘PWA’, try this (after your plot call): for k = 1:size(PWA,1) PWA0(k) = interp1(PWA(k,:), x, 0, ...

1 day ago | 0

Answered
Filling missing values of selected columns of a table with previous values
You most likely have to use fillmissing with each variable separately: Data.English = fillmissing(Data.English,'previous'); D...

1 day ago | 0

Answered
Why does the line for my graph not appear?
The reason is that ‘b’ has only the value at the end of the loop, so a scalar. Try this: syms x f = 5./((7+x).^2); a=0; ...

1 day ago | 0

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Answered
I am trying to accomplish this same task using the find() command but I'm not sure how.
Here is a version that uses a logical vector in place of the find function: x = 0:0.1:6; y = -5*x; lv = (2 <= x) & (x <= 4);...

2 days ago | 1

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Answered
getting user input in title and legend
I would use the inputdlg (link) function. You can also use input.

3 days ago | 0

Answered
sgolayfilt function not smoothing
Try it with a 3-degree polynomial rather than a 5-degree polynomial.

3 days ago | 0

Answered
Surface Plot for ODE solution
You need to make a few changes in your code: w = 1; k=1; figure tspan = linspace(0, 5); % ...

3 days ago | 0

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Answered
Solving Integrals with Matlab
There is an error in the anonymous function in ‘A3’, and since MATLAB is case-sensitive, ‘Intfun’ is not the same as ‘intfun’. ...

3 days ago | 0

Answered
Why is my Graph not plotting properly?
Add a counter. At the beginning of your while loop: k1 = 0; theta = 0; % Rotational arm angle % while(theta <= 360) % Bei...

3 days ago | 1

Answered
A Problem with function
Save it on your MATLAB search path of user files as: normalidade.m.

3 days ago | 0

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Answered
Phase Plot - Velocity vs Position
Unless I am not understanding your code, that would appear to be: figure(2) plot(y, v) grid xlabel('Position') yleabel('Ve...

4 days ago | 0

Answered
Fsurf plot wrong when x coefficient is 0
The fsurf function cannot guess what you are thinking. Try this version of your code: syms x y z u v f1(v) = 214.906098118...

4 days ago | 0

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Answered
Frequency scale in fft after zero filling (odd/even number of data)
I am not certain what you are doing. One way to make the frequencies equal would be to use the second argument, ‘n’, in the ff...

4 days ago | 1

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Answered
How do I extrapolate a point from a generated graph.
The easiest way is to use the interp1 (link) function to get the time when the car has travelled 250m.

4 days ago | 0

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Answered
How to use a subplot in a for loop
I am not certain what you want. Try this: syms y x y = acos(x); n = [3 5 7] ttlc = {'y', 'T3(x)', 'T5(x)', 'T7(x)'}; ho...

4 days ago | 0

Answered
How do I get some part of my boxplot labels italic? I can not change the Interpreter to 'tex' somehow? Why? How can I work around?
Use the 'TickLabelInterpreter' property: dados = rand(100,2); boxplot(dados,'labels',{'\bf\it{IDEB}__{2007}','\bf Efficiencie...

4 days ago | 0

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Answered
MATLAB system of ODEs
Please see: System of 2 differential equations (link).

5 days ago | 1

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Answered
i am trying to put my level curves and gradient vectors on same figure but i can't
Your current approach is not going to work. Try this instead: f=@(x,y) 16*y.^2 + 9*x.^2; g = @(z) gradient(z) figure(1) ...

5 days ago | 1

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Answered
How to change color for stacked bar chart
Try this: y = [50 50; 25 75; 30 70]; figure ba = bar(y,'stacked', 'FaceColor','flat'); ba(1).CData = [0.3 0.3 0.7]; ba(2...

5 days ago | 0

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Answered
Does audioread not return a vector?
It depends on your audio file. A stereophonic signal will return an (N x 2) matrix, with the first column being the left channe...

6 days ago | 0

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Answered
amplitude plot not working
Your ‘A’ vector has purely imaginary components. Try this: plot(omega, imag(A))

6 days ago | 0

Answered
How would I add labels to points?
Use the text (link) function. You will likely also need the sprintf function.

6 days ago | 0

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Answered
RMSE of sequences in cell arrays with different length
I am not certain what final result you want. This should get you started: subt = cellfun(@minus, YTest, YPred, 'Uni',0); ...

6 days ago | 0

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