Star Strider

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14,378 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

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Answered
glmfit not working: US's chances of recession
Use glmval to evaluate the result of the fit: T1 = readtable('USREC.xls'); ind = T1.ind; us2y10 = T1.us2y10; rec = T1.rec; ...

2 hours ago | 0

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How can I get peaks values and distance between them indicated in the figure?
The findpeaks function could possible do what you want.

7 hours ago | 0

Answered
Why won't this plot?
The problem are the y-axis limits in the axis call. Comment-out the axis call (as I do here) and you will immediately see the...

7 hours ago | 0

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Answered
Convert data plot from Cartesian to spherical coordinates
See if the cart2sph function will do what you want.

8 hours ago | 0

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Even binned histogram to uneven bins?
If you are using the histogram function, you can specify the bind widths using the edges option. See Specify Bin Edges of Histo...

8 hours ago | 0

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How do I troubleshoot if a plot line doesn't show up on a figure
It plots a horizontal dotted line at 55 from 0 to 7. If it works independently, then there are several possibilities, some of...

11 hours ago | 0

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How to make while loop faster ?
First, the number of iterations is going to be: n_iter = 1/D_1 evaluating to: n_iter = 6.666666666666667e+12 That is...

11 hours ago | 0

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Genetic Algorithm: undefined function or method for input arguments of type' double '.
The fitness function needs to accept arguments, and (in general) needs to return a scalar result. That will likely require that...

12 hours ago | 0

Answered
How to make a plot from for loop where the results are a 3x1 matrix?
Try this slight variation on your code: s=300; r=25; k=30; kukat=[s;r;k]; A=[0.23 0 233;0.74 0.52 0;0 0.35 0.46]; a=15; ...

13 hours ago | 0

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Answered
Finding different length pulses
Note that ‘clean them up’ is ever so slightly ambiguous. Assuming that the objective is to remove some of what might be consi...

13 hours ago | 0

Answered
Building Low-pass filter with Sinc function
I am not exactly certain what the problem is from a theoretical prespective (I will leave it to you to explore that), however th...

15 hours ago | 0

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Answered
Why didn't I get an error for my matrices?
You are seeing ‘Automatic Implicit Expansion’ introduced in R2016b (much to the consternation of many of us). Previously, the o...

16 hours ago | 0

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How do you plot the phase and amplitude of a complex function?
to calculate the amplitude, use the abs function. For the phase, use the angle function.

1 day ago | 1

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How to plot spectral density given a column of data?
My guess is that there is a significant d-c (constant) offfset. This is the mean of ‘x’, and will show up as the amplitude at ...

1 day ago | 1

Answered
Issues with entering into MATLAB
This sems to be homework. Vectorise the expoinentiation: y= (2*x.^1.01)+ sin(3*pi/2 *x)-10*cos(x)-3; ↑ ← HERE Th...

1 day ago | 0

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Answered
How to solve ODEs with time dependent parameters by ode45 method
I do not see any interp1 calls in the code you posted. To use a function in a calculation, the function needs to be evaluated...

1 day ago | 0

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Answered
How to read a list of strings in a txt file?
Unless I am missing something, ‘KKK’ is never incremented inside the while loop, so it will in fact be infinite. If you are a...

1 day ago | 0

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Answered
How can i work with a matrix that present floating points
If you want the (x,y) data for that contour, you need to ask contour to give it to you: c1000 = contour(x,y,bat_N,[-1000],'Sho...

1 day ago | 0

Answered
How to find a Y value of a given X?
This is easiest if you create ‘v’ as an anonymous function: t = 0:0.00001:0.01; v = @(t) 50*exp(-1600*t) - 50*exp(-400*t); ...

1 day ago | 0

Answered
MATLAB R2020a not running
See if the solution in: Why will MATLAB not start up properly on my Windows based system? will work. (It worked when I had a si...

1 day ago | 0

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How to make a square wave with a pulse
This is a slight variation on the method I showed you when you presented a similar problem yesterday in How to create a square w...

1 day ago | 0

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Undefined function or variable 'solv'.
Where did you save it? You must save it to a directory or your MATLAB user path, and MATLAB has to know that directory exists...

2 days ago | 0

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How to add a column to a table
Try this: Stream = mat2cell(randi(9,6,4), 6, ones(1,4)); % Create Stream WL = Stream{:,2}; H = Stream...

2 days ago | 0

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DateTime conversion from Table Column
The datetime function has a 'ConvertFrom' option. For one example, see: Convert Excel Date Number to Datetime There are other ...

2 days ago | 0

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Answered
how to modify the axis labels in the attached plot?
I could not get the axis tick labels to show with imshow, so I went with image instead (and a bit of manual editing to import th...

2 days ago | 1

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How can I save my results of a loop in one table
The adtest function returns scalars for the outputs, so something like this could work: [h(v_b, v_T),p(v_b, v_T)] = adtest(dat...

2 days ago | 1

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Answered
vpa() examples not working in R2020a
Try: sympref('default'); .

3 days ago | 1

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Answered
How to create a square wave pulse
Without the Signal Processing Toolbox: t = linspace(0, 10E-3); % Time Vector (0 - 10ms) f = 3...

3 days ago | 0

Answered
How to specify parameters for matlab's notch filter function
The Q-factor is the resonant frequency divided by the bandwidth, so smaller bandwidths result in higher Q-factors. The Q-factor...

3 days ago | 0

Answered
How to compare an integer to the elements of a vector?
Another approach: val = min(C(u<C)); idx = find(C == val); .

3 days ago | 0