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Star Strider


Last seen: Today
13,135 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
anonymous function and plotting
You are essentially where you want to be. It helps to assign the output of your function to a different variable. (I use ‘v’ h...

2 hours ago | 0

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Answered
How to change ASCII values?
You are not using tthe result of the upper call. See if: u = upper(k) y = double(u) is more appropriate.

1 day ago | 0

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How to vary a value inside an integral which is not getting integrated itself?
The integral2 and integral3 functions do not allow the 'ArrayValued' name-value pair, so it is necessary to ‘nest’ integral call...

1 day ago | 0

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how to get best 10 fitness values
If you have R2017b or later, mink would be easiest. Otherwise, use sort and take the first 10. (This assumes that ‘fitness’ is...

1 day ago | 0

Answered
stem fuction shows error everytime
You have a script file that you named ‘stem’. This is called ‘overhsadowing’ a MATLAB function. The solution is to find the ...

1 day ago | 0

Answered
Plotting two functions on 3D surface for the same interval
Try this: x = 0:10; Z1=x.^2; Z2=x.^3; figure surf(Z1.'*Z2) Another possibility: figure surf([Z1; Z2]) It is not cer...

2 days ago | 0

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Answered
Extract values common to 5 columns
Since it is not homework, see if this does what you want: A = randi(9,20,5); % Create Mat...

2 days ago | 0

Answered
How to use a vector to index another vector?
Testing the code (without the function definition or function call): t = (0:0.1:15); in = sin(t*2*pi); w = 5; out = in*0;...

2 days ago | 0

Answered
how can i work with two variables with genetic algorithm
It would be helpful to know what your fitness function is doing. If there are independent variables, you can combine them as:...

2 days ago | 0

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I want to generate a time vector
start = datetime('6:30 AM', 'InputFormat','h:mm a'); finish = datetime('3:00 PM', 'InputFormat','h:mm a'); interval = minutes(...

2 days ago | 0

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Answered
Is there a way to set the xticklabel text alignment
The example in Specify x-Axis Tick Values and Labels appear to be centre-aligned.

3 days ago | 0

Answered
If elseif else statement inside a loop
Perhaps: for k = 1:5 YourGrade= input('Enter your number grade:') if YourGrade >= 90; disp('Your grade is a...

3 days ago | 0

Answered
NaN issue when calculating for a mean value
The NaN result is due to one or more elements of the vector you are taking the mean of being (0/0) or (Inf/Inf), since they eval...

3 days ago | 0

Answered
Least squares regression of a quadratic without bx term.
Try this: DM = [x(:).^2 ones(size(x(:)))]; % Design Matrix B = DM \ y(:); ...

3 days ago | 0

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Answered
FFT analysis of multiple signals with the same response length
The fft function operates column-wise (unless the argument is a vector or you tell it otherwise), so this is all that is necessa...

3 days ago | 0

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Answered
solving differential equation and assigning value to symfun
Try this: t_val = vpasolve(ySol==1,t) % Symbolic Solution

3 days ago | 0

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Answered
Solving for a variable in equation
Use a root-finding function (I chose fzero here), then take the known variable values, create an anonymous function from the exp...

4 days ago | 0

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Answered
How to find data values that falls on line connecting loglog plot in matlab
To get a smooth interpolation, it is necessary to do two transformations on it. First, interpolate log(y), and then take the ex...

4 days ago | 0

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Answered
Magnitude, row and column in a Matrix
Try this: A = [87.97 87.97 17.97 95.22 87.96 91.26 75.50 75.50 75.50 78.13 64.89 78.90]; ...

4 days ago | 0

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Answered
How to solve non linear system of ODE
If you are fitting the differential equations to data, see Monod kinetics and curve fitting and Parameter Estimation for a Syste...

4 days ago | 0

Answered
How do I obtain the derivatives after interp2 with the 'spline' option?
To get a numerical derivative, use the gradient function. With a matrix input, request two outputs. See Contour Plot of Vect...

4 days ago | 0

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Answered
How to plot a two variable function?
Apparently ‘x’ is a vector. That means that ‘z’ produces only two values. You could plot it as: figure plot(z, 'p') howe...

4 days ago | 0

Answered
Easiest way to skip a few lines and then read data from this text file ( x and y) to draw a plot.
The easiest way I can think of is to use the dlmread function: filename = '6in_nomass_5.txt'; Data = dlmread(filename, '\t', ...

4 days ago | 0

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Answered
X,Y data of irregular grid, scatter plot with Z data
It is not obvious to me what you want. You already appear to have tried reshape, although I have no idea what the arguments ...

4 days ago | 0

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Answered
How do I synchronize stress-strain data?
If you want both of them to have the same sampling frequency, use the resample function on one of them. That will make the proc...

4 days ago | 0

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How to find the best parameters to fit damped oscillations curves
See: How to filter noise from time-frequency data and find natural frequency of a cantilever? Specifically: D = load('Lo...

4 days ago | 1

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Answered
fminsearch for fitting a function to experimental data
There are several errors in the posted code, as Walter noted, mostly involving implicit multiplication, that MATLAB does not rec...

4 days ago | 0

Answered
Interpolate Data and find the matching x-Value
Try this: data=[1 2, 2 3, 3 3, 4 5, 7 9]; xval = @(yval) fsolve(@(x) interp1(data(:,1...

4 days ago | 0

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Answered
Why ('t=(2x+1)/(2x-2)','x') is unsolvable?
Correct syntax: syms t x solve(t==(2*x+1)/(2*x-2),x) producing: ans = (2*t + 1)/(2*t - 2)

5 days ago | 0

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Answered
Wrong FFT for an audio file
The plot is correct. You are not considering the exponential multiplication at the right end of the frequency axis. This mak...

5 days ago | 0

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