Steven Lord

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MathWorks

4,903 2002 이후 총 참여 횟수

I joined The MathWorks in the Technical Support department during the summer of 2001 and transferred into the Quality Engineering department in March of 2004. I now work qualifying the core MATLAB numerical functions (PLUS, MINUS, LU, FFT, ODE45, etc.)
Professional Interests: mathematics, MATLAB

For assistance with MATLAB question please post to MATLAB Answers or contact Technical Support using the Contact Us link in the upper-right corner of the page instead of contacting me directly.

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Changing version of Python in MATLAB
See the "Set Python Version on Mac and Linux Platforms" section on this documentation page.

20분 전 | 0

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Syms function no longer works in a for loop which stores data
If you try to do something like the following: %{ syms x F = 0; F(2) = x; %} What numeric value should be stored in F(2) a...

27분 전 | 0

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Getting Error message when using backslash operator
You've posted the dydtsys_practice function that implements the right-hand side of your system of ODEs, but to solve the system ...

약 15시간 전 | 0

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How to find the inex of a randomly chosen element of an array
Start off generating the index and use it to extract the element. a = [4 8 15 16 23 42]; I = randi(numel(a)); fprintf("Elemen...

약 15시간 전 | 2

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Timestamp to Decimal day of year
dt = datetime('now', 'TimeZone', 'EST') startOfYear = dateshift(dt, 'start', 'year') fractionOfYear = years(dt - startOfYear) ...

1일 전 | 0

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Imagine a dice tetra-brick (four faces: 1, 2, 3, 4) with the following probabilities [0.5, 0.2, 0.2, 0.1] . Let Y be the Random Variable that simulate the output of rolling the dice.
Use histcounts or histogram. Alternately if this is part of a homework assignment and you're instructed not to use those functi...

2일 전 | 0

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How can I define the variable handles for this code. A is a numerical value not text "Undefined variable handles or class "handles.A"
Generally speaking, usually code that involves a struct array named handles is part of a GUI created using GUIDE. If you're tryi...

2일 전 | 0

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Simple, but stumped. Using 'xline' to create animated "play marker" across waveform plot.
Rather than deleting and recreating the line, change its properties. % Define the data x = 0:360; y = sind(x); % Create th...

2일 전 | 1

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The fix(x) command does not work
Just because a number is displayed as 1 in the default display format does not mean that the stored value is exactly 1. It's clo...

3일 전 | 0

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How to replace all newline characters in a string with a space?
Since this sounds like it may be a homework assignment, I'll only give a hint. There's one function in the "Create, Concatenate,...

3일 전 | 0

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Checking if a value is equal to zero or no ? with the problem of floating-point numbers !
Testing for exact, down-to-the-last-bit equality with == can be problematic. Instead, the general recommendation is to check for...

3일 전 | 0

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Help With Conditonally variant Anonymous function.
Let's say val is 2. So if Z is between 1 and 500 B2 should be -2, if it is between 501 and 1500 B2 should be 2, and if it is bet...

4일 전 | 0

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How do I call a function which I have defined within a class?
When you call a non-Static method of a class, at least one of the inputs to that method must be an instance of that class. With ...

5일 전 | 1

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Different results with same code??
m_s = 2000; %(kg) Sprung mass m_u = 200; %(kg) Un-sprung mass k_s = 200000...

5일 전 | 0

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Creating M histograms from an NxM table on separate plots
A = 2*randn(1e4, 6) + 5*(0:5); T = array2table(A); for k = 1:width(T) subplot(2, 3, k) histogram(T{:, k}) end Note...

6일 전 | 1

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Operands on table, comparison with numbers
say I fix one of the row indices " ind" .If I try say find(A(ind,:)>0.1) I get the error : "Operation '>' not supported for oper...

6일 전 | 0

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How to extract rows based on column values in a matrix?
This wasn't an option when the question was asked originally but depending what you're trying to do with those "3 matrices", usi...

6일 전 | 0

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Matlab 2020b does not find Xcode Mac OS Big Sur
I would try following the instruction in the warning message. Run Xcode (outside of MATLAB) and when it prompts you to accept th...

6일 전 | 0

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Create new column in table based on another column value
Let's start with a sample table. T = table([123; 345; 234], [9; 1; 3], 'VariableNames', ["ID", "Occurrences"]) Fill in the Uni...

6일 전 | 0

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Sorting time in 1 hour time slots.
minutesPerDay = minutes(days(1)); m = minutes(randi(minutesPerDay, 100, 1)); n = datetime('now'); t = n + m; h = histogram(t...

7일 전 | 0

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Generalized Eigenvalue Problem - Hessenberg Matrix
It sounds like you might want to use the syntax of eigs whose first input is Afun, a function handle that returns the result of ...

7일 전 | 0

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Error using inputdlg: dialogs disabled
Line 2 of the inputdlg function included in MATLAB is a comment describing the function. Therefore you have written or downloade...

8일 전 | 0

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Creating a symbolic array
If you want an array of q's: syms q A = repmat(q, [5 5])

8일 전 | 0

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Installing matlab 2019 on windows
Searching using Google for "exec error 22" found this MATLAB Answers post that appears to be relevant.

8일 전 | 0

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I can't create a graph from the adjacency matrix
I suspect you've created a digraph object and stored it in a variable named graph, which will prevent you from calling the graph...

8일 전 | 0

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How to find minimum value ,correspondings to a column ,in an output ?
The second output from the min function will help you retrieve the corresponding element of x.

8일 전 | 0

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tan verses tand error in loop
phi_o(i) = (atand((0.5*g*t(i).^2*((1/3)*(2*sqrt(Vx(i)/Vx_o)+1)))/x(i))); ...

9일 전 | 0

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How to get a function from user without knowing its symbols
The symvar and str2sym functions listed (along with many others) on this documentation page may be of interest to you.

9일 전 | 0

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how do I right x^2 in MATLAB
To raise a square matrix to a power use the ^ operator. To raise each element of an array (the array need not be square or even...

9일 전 | 0

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Why is line visible while its parent axes is unvisible?
Because the line has its own Visible property and that property's value is 'on'. fig = figure; ax = axes(fig, 'Visible', 'on')...

9일 전 | 0