Les Beckham

Last seen: Today | Actif depuis 2013

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Many years developing flight control algorithms and software

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

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Saving a struct to a text file exactly how it appears in command window
Here is one approach. path='F:\settings.txt'; settings = struct; %Create structure called settings % settings.exposure_...

8 jours il y a | 1

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Click in the beginning and end of pure tone
Try adding ramps at the beginning and end to avoid the discontinuities of starting and stopping the tone. spl_rms = 60; spl_p0...

17 jours il y a | 0

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My MATLAB code is showing blank plots instead of encrypted and decrypted images. Why? [Help]
You need to convert encryptedImage and decryptedImage back to uint8. This line is converting to double because SBox is double. ...

22 jours il y a | 0

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normalization data to 0-255
format long g A = [linspace(1, 10, 10); flip(linspace(3, 100, 10)); rand(1,10)].'; T = array2table(A, 'VariableNames', {'ID', ...

29 jours il y a | 0

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Plot line with custom color
This looks a bit jaggedy and dark here, but looks good in my desktop Matlab. If you had read the documentation for plot, you co...

29 jours il y a | 0

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i keep getting this error: Error: Function definitions in a script must appear at the end of the file. Move all statements after the function definition to before the ...
You must have some code in your script after the last end that you didn't post. Make sure that the function definition is the v...

29 jours il y a | 0

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Creating a rectangular patch using random numbers
The chances of four random points in 3d being coplanar are virtually zero. The chances of them forming a parallelogram are infi...

environ un mois il y a | 1

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Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parenthe
You are missing the multiplication operator in several places. For example: IndexImg((Orientation >= pi/8 & Orientation < pi/4...

environ un mois il y a | 0

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Is there a MatLab online training course that teaches you how to create and use functions?
There is a module in the Matlab Fundamentals online training that concentrates on functions: https://matlabacademy.mathworks.co...

environ un mois il y a | 0

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finding a numeric pattern in a vector
Note that I added an additional test at the end of vec to make sure this handles a multi-digit number in the middle position of ...

environ un mois il y a | 0

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How to extract specific dates from a datetime table?
whos('-file', 'DATE1.mat') whos('-file', 'DATE2.mat') load('DATE1.mat') load('DATE2.mat') whos head(datet) head(B) found_...

environ un mois il y a | 1

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How do I use xline() to plot values calculated in a for loop?
Your x is going to be symbolic based on the code you posted (you can verify this by using the whos in the Command Window or by l...

environ un mois il y a | 0

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What is the previous syntax for this function?
The strcat function has been around for a long time. strcat("Hello", "World")

environ un mois il y a | 0

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output of two function results
You need to provide two output variables when you call the function. Note that the names you use when you call the function don...

environ un mois il y a | 1

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Why are values not rotated?
P = [1 2]*10^7; % made up data to test with S = [1 2; 2 3]; T = [0 70; 0 100]; plot(S(1,:),T(1,:), S(2,:), T(2,:...

environ 2 mois il y a | 0

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Calculate the temperature distr
First of all, format your code (type Ctrl-A then Ctrl-I) in the Matlab editor. Second, add more comments. For example, is m ...

environ 2 mois il y a | 0

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Factorial using a for loop
Your code works fine (though I would add semicolons to the end of all lines except the for and end to avoid spewing a bunch of s...

environ 2 mois il y a | 2

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read several csv files with space in the name format
i = 1; filename2 = strcat('opt.w.matrix.reg. ',int2str(i),'.csv') As you have seen, strcat strips leading and trailing spaces....

environ 2 mois il y a | 0

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remove decimals from title when using sprintf
Q=2021; %year x = 0:10; y = x.^2; plot(x,y) grid on title(sprintf('text %d',Q)) % <<< replace %f with %d

environ 2 mois il y a | 0

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Error using .^ not enough input arguments
Perhaps you meant this instead % L = integral( sqrt(1+{power(dy/dx),2}),x1,x2); % ^ ^ remove...

environ 2 mois il y a | 0

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Most readable syntax to fill table in a for cycle
There probably isn't a significantly cleaner way to do this. See below for a way to suppress the warnings. format short e x =...

environ 2 mois il y a | 0

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How do i do x1<=x<=x2 in matlab?
You have to split up the compound condition into two conditions: (x1 <= x) && (x <= x2) If these terms are scalars, that will ...

environ 2 mois il y a | 0

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Formatting read data from text files
text_data = fileread('Question.txt'); disp(text_data)

environ 2 mois il y a | 1

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How can I save an animated plot as a GIF?
Check the answer to this question: https://www.mathworks.com/matlabcentral/answers/94495-how-can-i-create-animated-gif-images-i...

2 mois il y a | 0

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animated sine wave continously
This should get you started. Adjust as desired. Note that the animation won't show here, but I tested it my local copy of Matl...

2 mois il y a | 0

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saving workspace variables individually?
a = 1; b = 2; c = 3; vars = who for v = 1:numel(vars) save(sprintf('%s.mat', vars{v}), vars{v}) end dir

2 mois il y a | 0

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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...

2 mois il y a | 0

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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 mois il y a | 0

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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...

3 mois il y a | 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...

3 mois il y a | 0

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Les Beckham

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