# Les Beckham

Many years developing flight control algorithms and software

**Programming Languages:**

C++, C, C#, MATLAB, Assembly

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**Content Feed**

How to I parse an array of time stamp strings read into a table form a CSV file?

Don't operate on the timestamps as strings, use the datetime and duration types and the associated functions. times = linspace(...

2 dagen ago | 0

List of increasing integers

Are you sure that is what you want? It doesn't seem very useful. dim = [2 2 4 2 2 2 2 2 2 2 2 2] int = 1:sum(dim) int(end)

10 dagen ago | 0

How can I isolate a set of data points on a graph using conditionals?

The data doesn't need to be "linear" to use indexing to select the data that you want. For example: x = 1:10; y = rand(1, 10)...

16 dagen ago | 0

how to automate this manual code containing if else conditons?

Here is one approach. I eliminated the extraneous parameter ini for this example. I'm not sure I understand the role of the Ti...

17 dagen ago | 1

How to modify the slopes of the sawtooth wave?

It doesn't really make sense to me to talk about angles when referring to a time history of a signal. If you were to plot the s...

19 dagen ago | 1

Interphase - How to bring back default view?

If you are talking about the editor being split into multiple subwindows as shown below, go to the View tab in the tool strip an...

19 dagen ago | 0

| accepted

Convert Julian Date + Time in GMT to calendar day + Time in EST

It's not pretty, but it works. yr = '2024'; %<<< renamed to avoid shadowing the year function JDDD = 'J025'; % Julian date GM...

19 dagen ago | 1

how can i compute Aij?

It appears to work. I ran it for only 2 values of k as it was timing out here in Answers when running with 20 values of k. Wha...

20 dagen ago | 0

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Extract single-digit and double-digit numbers at the same time from a cell array with "regexp"

a={'1','3','6-10','11-20'}; b=regexp(a,'[0-9]+','match'); %<<< add the + to match multiple numeric characters b{:}

20 dagen ago | 1

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How to match mean and standard deviation of 2 datasets for data that cannot be less than 0

Your model data doesn't look at all like the observed data, so I'm not surprised that trying to force their statistics to match ...

25 dagen ago | 0

confirm valid file identifier before flcose?

If you call fopen on the file identifier when the file is closed it will return empty (instead of returning the filename). So, ...

ongeveer een maand ago | 0

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Why is the error in the attached code?

After adding end to all of the functions so that this would even run, you get an dimension error (see below). You are trying as...

ongeveer een maand ago | 0

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Need for help for performance improvement or refactoring methods on this code

Wow! That code gets weird really fast. First, you haven't posted code that will actually run. You've shown three functions ...

2 maanden ago | 0

How can I break a long column vector (281820X1) into 140 short column vectors (2013X1)?

Use reshape data = (1:281820)'; cols = 140; rows = numel(data) / cols; data_reshaped = reshape(data, [rows cols]); whos ...

3 maanden ago | 0

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How to include a negative number in initial conditions for Eulers method code?

It is always better to post example code as text rather than a screenshot. Nevertheless... Since the first element of x is -1 ...

3 maanden ago | 0

Plotting .mat file

That mat file doesn't contain anything interesting to plot. load metro.mat whos AudioInfo

3 maanden ago | 0

Load .txt file into matrix form

That looks like a good candidate for readmatrix. mtx = readmatrix('X_deg_10.txt'); size(mtx)

3 maanden ago | 0

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what's the index exceed error?

On the second pass through the for k = 1:20 loop, you are trying to access the second row of sig, but it only has one row.

3 maanden ago | 0

How can I import this data with a for loop?

You were very close. x = [3 5 7 9 11 12 14 15 16 17]; for i = 1:numel(x) fn = sprintf('PendulumTestData/TD%d/IK/HR_1.mot'...

3 maanden ago | 1

Adding zeros to a column vector to match a larger column vector

new_x= [x; zeros(length(y)-length(x), 1)]; % ^ ^ switch the arguments to zeros % use ...

3 maanden ago | 0

Plots: aligning categorical y-axis labels

% create dummy data y = [1,2,3]; x = [5,10,20]; err = 0.5*ones(size(y)); % draw plot figure(1) yyaxis right errorbar(x,...

3 maanden ago | 1

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Resolution of plot code errors

Why are you trying to do this with symbolic variables? It works using simple numeric variables. x = linspace(-5, 5, 500); y =...

3 maanden ago | 0

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Issue with delete(obj)

Here are some modifications that should get you closer to what you wan't. Note the comments I've added in the code to point out...

3 maanden ago | 0

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for loop does not iterate

Array indices in Matlab must be positive integers (or logical). You are trying to us xroots, a vector of complex numbers as the...

3 maanden ago | 0

How to save the result of each loop separately

Perhaps this (using a cell array)? y = [3 4]; for i = 1:length(y) x{i} = zeros(y(i), 2) end

3 maanden ago | 1

How would I plot this and then achieve minimum and maximum.

x = 0:0.1:15; % y=(x)^3/3-11(x)^2/2+24x << you were missing multiplication operators * % and the powers need to be .^ (element...

3 maanden ago | 0

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Hexadecimal Data Convert to signed int32

The hex2dec function assumes unsigned integer unless you tell it otherwise. You can either typecast the unsigned result to sign...

3 maanden ago | 2

wildcard in filename for readtable does not work

You must call readtable with a valid filename for an existing file. It will not accept wildcards. You could use uigetfile to o...

3 maanden ago | 0

Indexing with min and numel

vector1 = 1:5 vector2 = 2:7 N = max(numel(vector1), numel(vector2)) [n,I] = min([numel(vector1),numel(vector2)]) I'm not sur...

4 maanden ago | 1

Code gets stuck loading when I try to run it.

In your SEGMENT 1 code you have this line where you are updating time (even though the comment says "Height Update"). I don't s...

4 maanden ago | 0

| accepted