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# Les Beckham

Last seen: 1 day ago Active since 2013

Many years developing flight control algorithms and software

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

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Color in plot from Table
Just a couple of issues. You need column vectors to insert into the table, and you can only have a scalar string or char vector...

16 hours ago | 0

Convert C code to Matlab code for reading binary file
Your Matlab struct doesn't match the definition in the C code. For example, the third element is a char array of 100x1000 in th...

2 days ago | 0

Saving a structure array, not fields of it
s1 = struct('a', 1, 'b', 2') save('s1.mat', 's1') % don't use the '-struct' option clearvars whos load('s1.mat') whos Anot...

7 days ago | 0

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Find column number for every row in matrix
A = [ -1 4 1 1 -1 -1 -5 4 -1 ]; [row, col] = find(A > 0) [~,idx,~] = unique(row, 'first...

8 days ago | 0

Plot colored angle between two lines on the YZ plane
This doesn't look exactly like what you want, but should get you started. meta = [14.97, 29.84, 5.61]; meta_plan1 = [15, -10, ...

9 days ago | 1

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I have a problem with butter filter and I can’t fix it
The error was because you were trying to set the cutoff frequency at the Nyquist frequency (half the sample rate). The error me...

9 days ago | 0

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Simple loop with equation problem
Time(1) = [0]; Quantity(1) = 0.2; % Corrected initial condition Xt1 = 0.2; a = 0.5; t = 9; for i=1:t Xt1 = a * Xt1 * ...

10 days ago | 0

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How to use isoutlier based in a part of the data?
It seems like what you are wanting to do is to chop off the "increase at the end". Here is one way to do that by searching back...

16 days ago | 1

reading serial COM port on the fly (weighting scale -> WinPC)
The serial object overload of fopen doesn't have any output arguments, so change that line of code to the following. fopen(p) ...

16 days ago | 0

Plotting different color points based on array values
x = linspace(0, 10); y = sin(x); % test data yhi = y; ylo = y; threshold = 0.5; idxlo = y <= threshold; idxhi = y > thresh...

17 days ago | 1

How to bring a patch to the bottom of a figure?
The code you originally posted already had the lines on top. Just plot the lines after the patch. hold on c = fill([0 4 5 2 1...

17 days ago | 2

Not enough input arguments
Perhaps you have added the control system toolbox since last time this worked? That toolbox contains a function named pid that ...

20 days ago | 0

How do I get the text command to display my character string in one line on a plot?
r = pi; % arbitrary value for testing {'r =' r} % Matlab will put each element of a cell array on a different line in text, tit...

21 days ago | 0

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Using rmoutliers without a for loop
From the documentation of rmoutliers: B = rmoutliers(A) detects and removes outliers from the data in A. If A is a matrix, the...

21 days ago | 0

Significant digits in a matlab figure
plot(rand(1,20)) grid on xtickformat('%.3f')

22 days ago | 0

Convert datetime to numeric - preserve date format
Edited to work with datetime array vs a single datetime. d = datetime(['2023-02-27 14:00'; '2023-02-27 15:00']) % test data - r...

24 days ago | 0

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Intersection of two tables
A = table(); A.user = ["user1";"user2";"user3";"user4"]; A.value = [10;20;30;40] B = table(); B.user = ["user3";"user4";"u...

27 days ago | 0

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How do I plot 5e^(0.5t)sin(2*pi*t)
t1 = 0:10; e = exp((0.5)*t1); num6 = (5).*e.*sin((2)*pi*t1); plot(t1, num6, 'c') grid on You are plotting your exponential ...

27 days ago | 1

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I want to disable a subsystem at time 30 secs where the simulation execution time is 50 secs.How this can be done
I would recommend reading this page in the documentation. You can drive the enable input with the output of a less than block c...

28 days ago | 0

How I would determine if a string contains multiple substrings?
myString = "This has some words in it."; if contains(myString, "This") && contains(myString, "some") disp Yes else d...

28 days ago | 0

How to plot a trajectory with varying colour?
Take a look at this Answer which shows a trick for doing this using surface. https://www.mathworks.com/matlabcentral/answers/50...

28 days ago | 0

why do i get the error using alpha too many output arguments, can anyoen help please.
You get this error because you haven't defined alpha before Matlab tries to execute this line of code CE = DE*cos(alpha); Sinc...

29 days ago | 0

How to solve this matrix equation
Since there are more equations than unknowns, there is no unique solution. A least-squares solution can be found using the \ op...

1 month ago | 0

1 month ago | 0

Move x-axis labels below the axis after relocation
I think we are going to need to see more of your code to figure out what is happening. It seems to work for me (I tried it in m...

1 month ago | 0

truncated plot displayed adding the size
figure('DefaultAxesFontSize',16) semilogy([45,45],[10^-5,1],'--r') hold on semilogy([80,80],[10^-5,1],'--r') xlabel ('x','Fo...

1 month ago | 0

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How to call bash script in App Designer?
Read the documentation for this command: system

1 month ago | 0

Using 'while' loop to check if a file has been added to path
I would actually expect that your while loop wouldn't execute at all, since var.m is a standard Matlab command for calculating v...

1 month ago | 0