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Les Beckham


Last seen: Today Active since 2013

Many years developing flight control algorithms and software

Programming Languages:
C

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Answered
Formatting a vector to not include the first value
It seems like you could benefit from taking this introduction to using Matlab: Matlab onramp This is an example of very basic ...

4 giorni ago | 0

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Answered
Using plot handle to replot a graph
Read the documentation for the copyobj function. Here is an example: x = 0:0.1:10; y = [sin(x);cos(x);tan(x)]; for i = 1:3; ...

5 giorni ago | 1

| accepted

Answered
how do I swap both axes in the current plot
syms y U = y^2/2 - (3*y)/4; yrange = [0,1]; fp = fplot(U,yrange); plot(fp.YData,fp.XData) grid on

13 giorni ago | 1

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Answered
Code to determine a log of the mean for a column of numbers?
A = magic(4) logmean_col1 = log(mean(A(:,1))) max_col2 = max(A(:,2)) mean_col3 = mean(A(:,3)) mean_col4 = mean(A(:,4))

13 giorni ago | 1

Answered
Find unique number sets
A = [1 4; 2 3; 3 2; 1 4]; B = unique(sort(A, 2), 'rows')

14 giorni ago | 0

Answered
Why is Q=30 after the loop is ran?
B=1; Q=0; if B==1 && Q~=B Q=20; if B<0 || Q==20 % you just set Q equal to 20 on the line above so this condition is ...

14 giorni ago | 0

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Answered
How to plot the bode plot extracted from LTspice in Matlab?
I used the import tool to import the data as fixed width data (right click on the file in the Current Folder and select Import D...

14 giorni ago | 0

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Answered
If there is a coding "sqrt(sum(data(:,1:end).^2,2))" , so what is the function number 2 after comma?
That tells the sum() function to sum along the rows. See the documentation for sum here

14 giorni ago | 1

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Answered
Extracting data from a matlab figure and saving it as a .mat file
open('6000_1.fig') hl = findobj(gca, 'Type', 'line'); % find the lines x = get(hl, 'Xdata'); % extract the data y = get(hl, '...

15 giorni ago | 1

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Answered
Filling gaps in a vector using a secondary data set
rain1 = [nan nan 1:10 nan nan] % example data rain2 = [20:34] idx = isnan(rain1); % find where rain1 has nans rain1(idx) = ra...

15 giorni ago | 0

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Answered
Guessing the values of a function by using initial values
You don't have to "guess" the values of the function, you can just calculate them. Example x = [-20:.1:20]; y = x; [X,Y] = m...

15 giorni ago | 0

Answered
Replacing Values in Matrix that are not equal to 1 while excluding 'NaN'
test1 = [ NaN 2 9 2 -.23 NaN 3 2 -1 -1 NaN 6 -.4 -1 -.57 NaN] test2 ...

16 giorni ago | 0

Answered
Concatenating Edit Field value with an existing string in App Designer
First, if you are getting an error, that is usually what will help you (and us) figure out what is wrong so, please, post the co...

16 giorni ago | 0

Answered
How to tick the parameter in the plot of a parametric function?
Try this (or something similar): % Your original code t = linspace(0, 1, 1000); x = t.^2; y = t.^3; figure plot(x, y, '-'...

20 giorni ago | 1

Answered
Two easy questions (But I am confused)
Using smaller examples so we can see the results: S = magic(10) % sample matrix d = diag(S) % extract the diagonal elements %...

21 giorni ago | 0

Answered
How to plot a 3-D "hotspot" figure
I would suggest looking at this example for the scatter3 function: scatter3 with varying marker colors You could use your f(x, ...

22 giorni ago | 1

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Answered
How do I demagnify a help page?
Ctrl-Scroll Down will reduce the magnification

23 giorni ago | 0

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Answered
How can I programmatically open the results of a command in a new window without setting it to a variable?
I can only think of a way to do this in two steps rather than one. result = 2 + 2; openvar('result'); This should work in des...

24 giorni ago | 1

Answered
Efficient Way to find index of max column for each row
Are you wanting to find the column number of the maximum value in each row? If so, this is how you can do that: A = magic(5) %...

circa un mese ago | 0

Answered
Too many output arguments (five on output)
You are defining this function as a function that takes 5 input arguments and returns one output argument. function y_cubic=cub...

circa un mese ago | 0

Answered
Strange result in subtraction operation
The "obvious" result is 1.2e-14 not 1.12e-14 (the different last two digits in your original numbers at the 14 decimal place giv...

circa un mese ago | 0

Answered
Removing quotation marks in a string using for loop
The quotation marks are not actually part of the string. It is just displayed that way. Plus, since you are using strings inst...

circa un mese ago | 0

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Answered
What is this center line when I create m file from mlx file?
I believe that what you are seeing (if you are viewing these in the Matlab editor) is the "Right-hand text limit" line. You can...

circa 2 mesi ago | 0

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Answered
How to Extract 2048 values containing the maximum value?
Note that this plots the group that contains the maximum datapoint in all of the data. It does not "plot the largest 2048 value...

circa 2 mesi ago | 1

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Answered
How to find the zero vaue of a plot?
X=[0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20]; Y=[-0.88 -0.7489 -0.6178 -0.4867 -0.3556 -0.2245 -0.0934 0.0378 0.168...

circa 2 mesi ago | 1

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Answered
Display time before the prompt arrows
See this utility on the File Exchange: https://www.mathworks.com/matlabcentral/fileexchange/26471-setprompt-set-the-command-win...

circa 2 mesi ago | 1

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Answered
How to do the example below in MatLab? I am dealing with same sort of problem in matlab
Something like this should do what you want (using made up example data): % simulating read of csv file1 (replace by data1 = re...

2 mesi ago | 1

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Answered
Where is the error in my code?
You need to specify an increment size if you expect r to be a vector. Currently it is a scalar equal to zero. Q will not be a ...

2 mesi ago | 0

Answered
help on graph (w/o common matrix plotting built-in functions)
In that case, maybe something like this will get you close. A = randi(2,10,365)-1; x = 1:size(A,2); y = size(A,1):-1:1; for ...

3 mesi ago | 0

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Answered
help on graph (w/o common matrix plotting built-in functions)
A = randi(2,10,365)-1 str = repmat(' ', size(A)); str(A==1) = '-'; disp(str)

3 mesi ago | 1

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