Community Profile # Les Beckham

Last seen: Today Aktiv seit 2013

Many years developing flight control algorithms and software

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

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Beantwortet
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...

2 Tage vor | 1

Beantwortet
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...

20 Tage vor | 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...

20 Tage vor | 0

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Beantwortet
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...

20 Tage vor | 0

Beantwortet
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 ...

22 Tage vor | 1

Beantwortet
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) ...

27 Tage vor | 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...

28 Tage vor | 4

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Beantwortet
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...

etwa ein Monat vor | 0

Beantwortet
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...

etwa ein Monat vor | 1

Beantwortet
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

etwa ein Monat vor | 1

Beantwortet
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...

etwa ein Monat vor | 1

Beantwortet
How to specify relative code paths in S-function builder

etwa 2 Monate vor | 0

Beantwortet
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...

etwa 2 Monate vor | 1

Beantwortet
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...

etwa 2 Monate vor | 0

Beantwortet
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 Monate vor | 0

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Beantwortet
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 Monate vor | 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 Monate vor | 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 Monate vor | 0

Beantwortet
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 Monate vor | 0

Beantwortet
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 Monate vor | 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 Monate vor | 1

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Beantwortet
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 Monate vor | 1

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Beantwortet
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 Monate vor | 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 Monate vor | 3

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Beantwortet
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...

3 Monate vor | 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 Monate vor | 0

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Beantwortet
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 Monate vor | 0

Beantwortet
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 Monate vor | 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 Monate vor | 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 Monate vor | 0