Les Beckham

Last seen: Today | Con actividad desde 2013

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Many years developing flight control algorithms and software

Programming Languages:
C++, C, C#, MATLAB, Assembly

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Respondida
day and month inverted in the time scaling
If you created your "time x array" by reading strings from a text file, for example, you need to specify the 'InputFormat' argum...

3 días hace | 1

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Optimize live plotting with a large data set
You definitely don't want to call plot repeatedly inside your loop. Here is a suggested approach where I created the plot outsi...

21 días hace | 0

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Problem 568. Number of 1s in a binary string
The find() function returns the index of all non-zero elements in the input. ASCII characters (like '0' and '1') are all non-ze...

21 días hace | 0

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I have a problem with my code
You have the following important line in your code commented out (the definition of the solve_friction_factor() function). Unco...

21 días hace | 0

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Matrix to Scalar Problem
t=0:3:60;%seconds Pos0=1;%position <<< Pos0 can't be zero since you divide by Wd*Pos0 when calculating alfa Vel0=0;%velocity ...

23 días hace | 1

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How to increase the tolerance for comparing time points when synchronizing timetables?
Based on this section of the documentation: Synchronize Timetables to Arbitrary Time Vector N = 9; dt = .3; mkTime = @(t0) ...

28 días hace | 0

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How to create plot from the data in .txt file ?
This should get you started. Note that the warnings are expected and can be ignored. T = readtable('Spatial Density.txt', 'Emp...

29 días hace | 4

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How do you cluster lines in 3D space?
I would suggest something like this since the main difference in your "groups" seems to be the approximate slopes of the three g...

alrededor de 1 mes hace | 0

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Converting the outpur of a fit (e.g. sfit) into a string format, then pasting the text to a Text Area in app desginer
Another option (which does essentially the same thing) is this: load census; f = fit(cdate,pop,'poly2'); s = formattedDispl...

alrededor de 1 mes hace | 1

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Why is NaN inserted in wrong position?
b = [1 3 0;-2 -1 5]; b(b(:,3)==5,3) = NaN % add ,3 to select only the third column for assignment

alrededor de 1 mes hace | 1

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How I get the frequencies in Hz of a specific signal?
I think this is close to what you are looking for. % % This code will generate a saltatory stimulus of 10 Hz up to 800 Hrz (the...

alrededor de 1 mes hace | 1

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How to specify relative code paths in S-function builder
Have you tried the suggestion in this answer? https://www.mathworks.com/matlabcentral/answers/1568023-how-to-specify-relative-...

alrededor de 2 meses hace | 0

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How to calculate the average of a cell array?
T = {[10, 1, 30], [15, 2, 10], [20, 3, 20]} A = vertcat(T{:}) % make an array from the elements of the cell array by stacking t...

alrededor de 2 meses hace | 1

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errore too many output
You are trying to do this [norm_sp,f_vector]=fft(acc_z,fs(n)); If you look at the documentation for fft you will see that ther...

alrededor de 2 meses hace | 0

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Read in a general binary file (for example, but not exclusively a jpeg file), make a modification and write a new file out verbatim--no altered bytes.
fileread reads the file as text. You need to open the file and read it as binary bytes (uint8) and then process it that way. R...

2 meses hace | 0

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Respondida
Having issues with plotting a single level contour line on a matrix that has edges
From your simple example, it can be seen that there actually are two places where the interpolated surface passes through the le...

2 meses hace | 1

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How to add rows containing zeros to a matrix
Here is another way. A = rand(2,6) A(4,6) = 0

2 meses hace | 0

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Plotcube function not working
There is a plotcube function on the file exchange: https://www.mathworks.com/matlabcentral/fileexchange/15161-plotcube?s_tid=sr...

2 meses hace | 0

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Keep the latest desired value before changing to undesired value
There might be a way to do this using just basic Simulink blocks, but I don't have Simulink right now to test with. So, I'm goi...

2 meses hace | 0

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Iterative Process to find a variable in which two equations are equal and opposite
I would use fminsearch for this. See below. Note that I am using abs(A - B) for the Error term. % minimize error between two ...

3 meses hace | 0

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Show only a part of the yaxis
Here is a kind of messy workaround. Note that this doesn't work if you have the grid on. h = plot(linspace(-2, 2, 1000), atan(...

3 meses hace | 1

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Smooth curve in certain regions to get desired output
Maybe you can adapt this approach to get what you want. This uses two different moving average filters for the start and end of ...

3 meses hace | 1

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How to model secant and cosecant in Simulink
If I remember correctly, there is only one "Trigonometric Function" block in Simulink. Just double click the block and change t...

3 meses hace | 0

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Why is the number of periods of a cosine wave in the plot changing with the number of samples ?
This is called aliasing. I recommend reading the linked Wikipedia article. The sample rate (in this case the number of time sam...

3 meses hace | 3

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Plot with x-axis limits going from [180:360] then [0:180] contiguously
It seems extremely odd that your data would "wrap" at 250 degrees. Nevertheless... elevation = [26:80 0:25]; azimuth = linspa...

4 meses hace | 0

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another crazy plot layout with zoomed portions and arrows
Hopefully you can adapt this approach to your needs. x = linspace(0, 10, 1000); y = exp(-x); plot(x, y) grid on ax = axes('...

4 meses hace | 0

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Respondida
A little help with translating a piece of Fortran code to Matlab
The easiest way to read a file line by line in Matlab is with the readlines function. Example: str = readlines('test.txt')

4 meses hace | 0

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subplot with 1 large and 2 small figures
Yes it is. Here is an example. See the documentation for tiledlayout. tiledlayout(2, 2) nexttile([1 2]) % first plot spans tw...

4 meses hace | 2

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select, only once, the names present in a struct
S.Number = compose('%04d', 0:16)'; % create test data since you only included a picture of your data desc = {'Scout'; 'Scout'; ...

4 meses hace | 0

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Missing data retrieve from a periodic pattern.
load('TempRecord.mat'); plot(T.Time, T.Temp) grid on There is definitely not enough information here to fill in those large g...

4 meses hace | 0

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Les Beckham

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