# 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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Combing Date and Time Variables into ONE DateTime Vector
So you have a datetime array and a duration array? n = 10; dt = datetime(2024, 6, randi(30, n, 1)) du = duration(randi(24, n,...

5 jours il y a | 0

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make vectors same length using min function
x = [2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016]; y = [0, 0.05, 0.1, 0.15, 0.2]; a = [2008, 2009,...

5 jours il y a | 0

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Error: Children may only be set to a permutation of itself
In programmatic code, ideally you should use a specific axes handle rather than trusting that gca returns the axes you think it ...

5 jours il y a | 1

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Join Subgraphs into a new Graph
G1 = graph(randi(10, 20, 1), randi(10, 20, 1)); G2 = graph(randi(10, 20, 1), randi(10, 20, 1)); Here I have two random graphs,...

5 jours il y a | 1

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Find value of large number
Use Symbolic Math Toolbox. Define your constants symbolically. % Define the constants B_2 = sym(0.18525); H = sym('3000175332...

5 jours il y a | 0

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Working with modified code -2024A
If your system of ODEs is taking a long time, it may be stiff. Try using one of the stiffer solvers. Alternately you could try ...

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How to Create Slicing Number of 2D plots in matlab
Looking at this documentation page, I think what you want is slice.

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Calculate mean of all variables that have a mean
Instead of calling varfun twice as the answer posted by @Arun does, call it once with the InputVariables name-value argument. Th...

8 jours il y a | 1

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Assigning a line plot object to a global property doesn't retain it after the object is deleted
All of the handles to the line object (which is a handle object) are references to the same thing on the screen. If you delete()...

8 jours il y a | 2

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No se como crear un 4x1 polyshape with 3 properties
What is the data type and size of the cborders variable used on line 19 of your untitled2.m file? You could add this command imm...

9 jours il y a | 0

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How to extract latitude and longitudes from a table given the timestamp range?
Use a timerange object as the row index into your timetable. Time = datetime({'12/18/2015 08:00:00';'12/18/2015 10:00:0';'12/18...

9 jours il y a | 0

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How can I get script's location when running one section of a script?
Rather than depending on what is the current directory when running the code (which is subject to change when you're running the...

9 jours il y a | 1

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Time format is changed to decimal when calling the time data from excel.
In matlab, when i read a time data (hh:mm:ss AM/PM) from excel, How are you reading the data from the Microsoft Excel spreadshe...

9 jours il y a | 0

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Does Matlab automatically vectorize for loops?
In general we don't discuss what the JIT does internally as we don't want users to try to code against that always-moving target...

10 jours il y a | 2

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Can't run script in namespace directory
You can run a script in a namespace. You need to use the name of the namespace as part of the command, just like you would when ...

10 jours il y a | 0

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3d arrays Matrix multiplication with a vector
This wasn't an option when the question was asked originally, but since release R2020b you can use pagemtimes. Let's make a smal...

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Converting Unix Timestamp to Date Time
Use the 'ConvertFrom' option in your datetime call. This tells datetime how to interpret the value you pass into it. I think you...

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Incosistency Precision Value (decimal double) When using strcmpi/contains
If you're trying to determine if one number is contained inside another array of numbers, converting them to strings then using ...

11 jours il y a | 1

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Passing output from a ButtonDownFcn callback function
Callback functions for Handle Graphics objects don't return output arguments. [Where would it return those output arguments to? ...

11 jours il y a | 0

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scope marker to line
The Scope block in a Simulink model will plot the data that is passed into it. If you want the block's plot to show the signal l...

11 jours il y a | 1

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How to count the number of scatter points of each color
Rather than creating one scatter plot for each individual point, I'd use that loop to create a vector of data that indicates in ...

12 jours il y a | 1

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is matlab automatically updating xlim and ylim?
If you want to prevent MATLAB from automatically updating the axes limits when you add new data to the axes, set the XLimMode, Y...

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intarpulation on a sin wall
Just based on the code you showed, the main suggestion I have is not to recreate the scatteredInterpolant object every time. Jus...

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Unexpected prompt characters on command line output
Rather than piping the contents of the file to MATLAB, do you see this same behavior if you use the -batch startup option listed...

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MATLAB doesn't have a 14-bit integer type. The closest larger type is the signed 16-bit integer type int16. From the fread docum...

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is there way to convert this python code to matlab code? how can i convert python code to matlab? this is the code that I want to convert:
Do you need to convert the code or do you just need to run the code? If the latter, see this section of the documentation.

17 jours il y a | 0

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Average Calculation and Array in For Loop
When i is equal to 1, attempting to index into m with i-1 (otherwise known as 0) as an index would error if the short-circuit &&...

17 jours il y a | 0

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Still waiting for my order to be processed

18 jours il y a | 1

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Flipping Sign provide wrong information and Answers
How exactly does this reordering "change the meaning of the equation"? The derivative of with respect to is . In this case, x ...

18 jours il y a | 2

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Find Number of Elements in an Array
Yet another way to do this: A = ['KM'; 'KL'; 'MN'; 'KM'; 'MM'; 'KL']; [counts, values] = histcounts(categorical(cellstr(A)))

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