Steven Lord

MathWorks

Last seen: Today | Active since 2002

Followers: 3 Following: 0

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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Prevent mlint warning for onCleanup like return value
So I wrote a cleanup function which accepts parameters, so you can write cleandir = onCleanup_lazy( @(x) cd( x ), pwd ); B...

1 day ago | 0

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Solve differential equation for a sequence of k values
The ballode example included in MATLAB does something like this, though instead of dividing the interval that the ball is in mot...

2 days ago | 0

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How to apply NonNegativity constraint in ODE solver when defining ode as a structure
The relevant property of the ode object to specify that some of the variables must be non-negative is NonNegativeVariables. Afte...

2 days ago | 0

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Unable to recognise function from called script
Local functions in a script are only directly callable from within that script file. You could call them indirectly by calling t...

2 days ago | 0

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Faster alternate to all() function
Are you sure the longest time is spent in all? Reducing the size of the varname variable and the number of iterations a bit (so ...

3 days ago | 1

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Error using horzcat Requested 36x28689400 (7.7GB) array exceeds
That suggests to me that your system of ODEs is stiff and so ode45 requires a lot of time steps. Try a stiffer solver like ode23...

3 days ago | 1

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hi i started the matlab onramp course and im stuck on this further practice question i wld appreciate if anyone cld help me or even give an hint
As Image Analyst stated, it's an informational message not a question. Its intent is to let you know that the indices you use to...

3 days ago | 0

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License installation key for 2022A
If you're trying to use your company or educational institution's license, ask whoever maintains the organization's software lic...

4 days ago | 0

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MATLAB 2024a readtable error
Please attempt to reproduce this failure on your machine. If you can, immediately (before running any other command that could t...

4 days ago | 1

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Is there a command to copy output of fprintf (sent to the matlab terminal) to windows clipboard?
Use sprintf instead of fprintf and pass the output from sprintf into the clipboard function as the second input. x1 = sprintf('...

4 days ago | 1

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Can anyone help me for knowing the options of genetic algorithm?
Since you've said you're a beginner with MATLAB (and presumably Global Optimization Toolbox), I recommend starting off with the ...

5 days ago | 0

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=polyfit function give error in matlab app designer app
Can you show us exactly how x and y are defined in your App Designer code? If you're retrieving them from a property of an edit ...

5 days ago | 0

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Is there more than one way to make a class abstract?
As stated on this documentation page, there are several ways to make a class abstract. "A class is abstract when it declares: ...

5 days ago | 0

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function chaining when one function has multiple outputs
Suppose you had a function that could be called with either 1 output or more outputs, and a function that can accept 1 input or ...

6 days ago | 2

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Solving Duffing Equation with the new framework for ODEs
FYI rather than interpolating the solution yourself with this code: % Interpolate the solution to get more points for plotting ...

8 days ago | 0

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get the whole sentence truncated
Set its Tooltip property.

10 days ago | 1

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Finding mode of each row in an array of Strings
If these strings represent data from one of several values in a category, consider storing the data as a categorical array. str...

11 days ago | 1

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trying to follow the convert-to-spiking example. load("DigitsDataTrain") does not work. I can't find a DOWNLOAD for this .mat file either. John
Open the example in MATLAB or in MATLAB Online. This will cause the current directory to change to the directory containing the ...

12 days ago | 0

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Problem with direct calculation on table with std and "omitnan"
This looks like a bug to me. It seems that std for table arrays assumes that if you're passing the missingflag input that you've...

12 days ago | 0

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Help Needed: Fixing Indexing Error in MATLAB Random Name Generator Code
Others have suggested using curly braces to extract the contents of a cell from the cell arrays firstNames and lastNames. Anothe...

12 days ago | 0

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Create and plot an oriented graph of a circuit from a netlist
Note that your list of sourceNodes and targetNodes only includes three unique entries: 0 (which I assume is ground), N001, and N...

12 days ago | 0

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Convert string of nested field names to variable without eval?
Use getfield. S.Data.Configuration.FieldofInterest = 42; fnlist = 'S.Data.Configuration.FieldofInterest'; Split the string re...

16 days ago | 1

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2024a seems to have a graphics bug
That suggests to me that you have defined or downloaded a function that shadows one of the built-in functions used inside hgrc.m...

16 days ago | 0

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Prevent error: "Unable to communicate with required MathWorks services (error 5001)"
What did Technical Support say when you contacted them as recommended in step 4 on the page to which you linked?

16 days ago | 0

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How can I implement this function in matlab?
To integrate a function numerically, see the integral function in MATLAB. To integrate a function symbolically, see the int fun...

17 days ago | 2

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Why isn't the numerical value assigned by matlab verified using == function.
This behavior is a consequence of floating point arithmetic. See this Answers post and the "Avoiding Common Problems with Floati...

17 days ago | 0

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Work Around for Convolution1DLayer
Are you certain that you're using release R2024a? It appears from the Release Notes that support for generating code from this l...

18 days ago | 0

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How to use FSOLVE with multiple variables?
That doesn't look like an error message that would come from MATLAB or Optimization Toolbox. In addition, your code is not synta...

18 days ago | 0

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Calling a function with no arguments
Outputs but no inputs To call a function with outputs but no inputs, you can omit the parentheses or just include the parenthes...

19 days ago | 2

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multiplying a function handle by a constant
You cannot directly multiply a function handle by a number. But you can multiple the value you receive by evaluating a function ...

20 days ago | 1