Steven Lord - MATLAB Central
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Steven Lord

MathWorks

Last seen: Today |  Actif depuis 2002

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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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Réponse apportée
sub2ind() errors out with NaN inputs - handled differently since R2024a
This was a bug fix introduced in release R2024a.

1 jour il y a | 2

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Table.Properties.VariableNames will add ... to long Variable Names
Is that an artifact of how the cell array is displayed in the Workspace (which I suspect is the case) or how the data is stored ...

6 jours il y a | 1

| A accepté

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MATLAB 2023b Keeps Crashing on My Windows Desktop But Works on Laptop
Can you check if you're using one of the processors listed in this Answers post?

7 jours il y a | 1

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Wind rose with no degrees for direction
Let's make some random direction data. directions = ["N", "NE", "E", "SE", "S", "SW", "W", "NW"]; n = numel(directions); angl...

8 jours il y a | 0

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The memory use of a sparse matrix depends on its history
The amount of memory required by a sparse matrix is not just a function of the number of rows and columns but also the number of...

8 jours il y a | 2

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How to find the execute but don't display output syntax of a loop?
FYI, this wasn't available when the question was originally asked but as of release R2024b you can tell MATLAB to stop whenever ...

9 jours il y a | 0

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Matlab 2024b won't open on Windows 11
Scanning through the Bug Reports for MATLAB release R2024b, I found two that might cause MATLAB to not be able to open. See Bug ...

16 jours il y a | 0

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operator '==' not supported for operands of type 'cell'
Another possibility for the original question would be to create a pivot table or to use groupcounts or other grouping functions...

16 jours il y a | 0

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MATLAB Incorrect number or types of inputs or outputs for function solve.
Let's choose a small value for n (since the input command cannot run on MATLAB Answers) and see what you're trying to pass into ...

21 jours il y a | 0

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Numerical integration of N by 1 matrics
See the trapz and cumtrapz functions.

23 jours il y a | 0

| A accepté

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I am trying to recreate a plot from a literature review. It is a scatter graph but the axis are labels more than specific numbers
I'm not certain what the significance of the unlabeled horizontal lines are, but you can create a scatter plot with categorical ...

23 jours il y a | 0

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Is it better to use tic/toc or a timer function for tracking time?
If you want to retrieve the current time, use: dt = datetime('now') To retrieve it as text data: s = string(dt) Depending on...

24 jours il y a | 0

| A accepté

Réponse apportée
isnan to conver nan to zero in a table
Let's make a sample table with some NaN values and a non-numeric variable. A = magic(4); A(randperm(numel(A), 3)) = NaN; T = ...

24 jours il y a | 1

| A accepté

Réponse apportée
Why are my licenses not linking to my account
I assume you are one of your company's license administrators? If so please contact Customer Service directly using this link an...

29 jours il y a | 0

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How to convert python scipt to matlab using any matlan converter or else
I would see if the "Call Python from MATLAB" section linked from this documentation page provides the functionality you need.

29 jours il y a | 1

Réponse apportée
Find closest value in array
As of release R2021b, you don't need to use abs on the input to the min function. Use the 'ComparisonMethod' option to tell MATL...

30 jours il y a | 1

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remove non-unique columns even if the sign has changed
Make a copy of newca1, let's call it M. Multiply each column of M whose first element is negative by -1. This way if you think o...

30 jours il y a | 0

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Error using Matlab's publish function to create a pdf
I tried searching our internal bug database but I didn't find anything that looked exactly like this issue. I've reached out to ...

environ un mois il y a | 0

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Request for Cancellation of Full Toolbox Tutorial and Reversion to Original Trial State
Please contact Customer Service directly using this link with this request.

environ un mois il y a | 1

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Clicking on hyperlink for an "example" on MATLAB command line help changes my current directory
Do you want to read the example and potentially run some or all of it? I think that's a pretty common workflow for the examples....

environ un mois il y a | 0

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How does code sharing work in MATLAB?
Some of the functionality listed in the Software Development Tools category in the MATLAB documentation was not available in 202...

environ un mois il y a | 1

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cant get object's method to return multiple outputs
From the error message I suspect the class overloads indexing, either by overloading subsref or using one or more of the indexin...

environ un mois il y a | 0

| A accepté

Réponse apportée
defining upper and lower limits of a matrix
If you were using release R2024a or later (or if upgrading is an option) you could use the clip function. M = magic(5) M2 = cl...

environ un mois il y a | 1

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sprintf
This wasn't an option when the question was originally asked, but in more recent releases I recommend storing the names as a str...

environ un mois il y a | 0

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keep exact position of subplot axes
To clarify, when you say "position" do you mean the location of the subplot axes in the figure window, the limits of the axes (s...

environ un mois il y a | 0

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Trouble parsing ISO8601 date strings into datetime
Looking at the description of the Format property on the documentation page for the datetime function I think you want ZZZZZ or ...

environ un mois il y a | 2

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Are namespaces packages?
It is a new thing. namespaces The + directory hierarchy that used to be called packages are now called namespaces, so using an...

environ un mois il y a | 1

| A accepté

Réponse apportée
How to find the RMSE?
If you're using release R2022b or later, use the rmse function on your data.

environ un mois il y a | 0

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Converting product into individual entries
If you have the individual terms and their replication factors already, see the repelem function. If you don't you may need to u...

environ 2 mois il y a | 0

| A accepté

Réponse apportée
How do I create a game update in a while loop
numPasses = 0; expectedDuration = seconds(1/30); while numPasses < 5 dt = datetime('now'); n = 0; while datetime('now')-dt ...

environ 2 mois il y a | 0

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