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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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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); ...

alrededor de 16 horas ago | 0

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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...

alrededor de 19 horas ago | 0

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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,...

alrededor de 20 horas ago | 0

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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...

alrededor de 21 horas ago | 0

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.

1 día ago | 0

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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 día ago | 0

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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 día ago | 0

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 día ago | 0

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 día ago | 0

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; ...

2 días ago | 0

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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 días ago | 1

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

3 días ago | 0

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

3 días ago | 0

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 días ago | 0

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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 días ago | 0

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 días ago | 1

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

3 días ago | 0

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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 días ago | 0

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 días ago | 0

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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 días ago | 1

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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 días ago | 0

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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 días ago | 0

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?

4 días ago | 0

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MATLAB system of ODEs

5 días ago | 1

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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 días ago | 1

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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 días ago | 0

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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 días ago | 0

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

6 días ago | 0

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

6 días ago | 0

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