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Steven Lord

MathWorks

Last seen: Today |  Active since 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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Answered
Correct way to test if a value is a function?
If you are debugging (note: don't use this in "production" code, as called out in the Note on its documentation page) you could ...

11 days ago | 0

Answered
Code Matlab for a function that depends in a real parameter
Parameterize the function you pass into the integral function. See the "Parameterized Function" example on the integral document...

14 days ago | 0

Answered
Why the squeeze function squeeze 1x3 array to 1x3, but squeeze 1x1x1x3x1 to 3x1?
If I recall correctly (this was before my time at MathWorks started) squeeze was introduced when we introduced arrays with more ...

14 days ago | 0

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Answered
Is there a function to tell if Matlab is using little-endian or big-endian on current computer?
See the third output from the computer function. [str, maxsize, endianness] = computer

14 days ago | 0

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Answered
Vector where each value is X times larger than the last
Use cumprod. x = [2 3*ones(1, 4)] y = cumprod(x) If you don't know how many elements you want y to have, just what you want t...

14 days ago | 0

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Answered
Constraint set to be a real number
The outputs from the nonlinear constraint function should not be boolean values. They should be continuous values. Try making y...

16 days ago | 1

Answered
i need activation key,pleases help me
If you're trying to use your company or educational institution's license, ask whoever maintains the organization's software lic...

17 days ago | 0

Answered
Parfor random numbers are not quite random
I would expect all the elements of v to be unique because they are randomly generated. However, I observe that many of them coi...

17 days ago | 0

Answered
From perpetual and individual Matlab student license to academic and permanent Matlab license
I recommend you contact Customer Service directly using this link or the Sales department directly using this link for help with...

18 days ago | 0

Answered
How to efficiently pass input arguments to a compiled app?
See this documentation page.

19 days ago | 0

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Answered
What is the difference between these two commands?
s = [3 4] What you wrote won't work. It may seem deterministic in this scenario but in general it's ambiguous. try [m n] ...

19 days ago | 1

Answered
With contour of image how to change x and y axis?
As written you're using the contour(Z) syntax shown in the Syntax section on the contour function documentation page. The Descri...

20 days ago | 0

Answered
Appdesigner Question: Is it possible for a user to reset a default value?
One potential approach is to use custom settings. From that documentation page, "You can create custom settings to store and acc...

21 days ago | 0

Answered
Filtering test cases out of a test suite
I am writing a script that takes in a matlab.unittest.TestSuite object that contains several test cases from tests (call this te...

22 days ago | 0

Answered
Vectorized code slower than loops
Vectorization is one tool in your MATLAB toolbox, but so is the for loop. Each has its own pros and cons. I think Mike Croucher...

26 days ago | 3

Answered
What is the extended symbolic math toolbox?
It was a product that extended Symbolic Math Toolbox functionality. Many years ago (I don't remember the release offhand) the fu...

26 days ago | 1

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Answered
Hello, I'm trying to create a plot for an equation of motion defined as a function.
Please show (or even attach) the full and exact file. My suspicion is that the lines where you define those constants are ahead ...

27 days ago | 0

Answered
finding the value at a specific time from second-order ODE
You could call ode45 with just one output argument and then call deval, or you could call ode45 with the desired time as one ele...

28 days ago | 1

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Answered
Combine Two polyshape Objects Similar to addCell Functionality
p1 = nsidedpoly(4); p2 = nsidedpoly(5); The union function makes a polyshape with 1 region. P = union(p1, p2) Concatenation ...

29 days ago | 0

Answered
how would one use logic commands to run separate function files with single-statement intput?
Use the input function with the 's' option to allow the user to type in a string, or you could use uigetfile to let the user sel...

1 month ago | 1

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Answered
Spacing correction in documentation.
The spacing looks correct to me in the version of the documentation online to which you linked. Could you state which browser yo...

1 month ago | 0

Answered
Matlab Compiler: Is "userpath" always there and accessible?
I would probably try using the tempdir and/or tempname functions.

1 month ago | 0

Answered
Using accumarray or a similar method for tables
This wasn't an option in the release the original poster was using (the two functions required were released in release R2016b, ...

1 month ago | 1

Answered
Convert a Cell array to a timetable
If you have a set of row vectors in a cell array sampleCell = {1:10, 11:20, 21:30}; first to accomplish your stated goal you n...

1 month ago | 0

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Answered
Can the random function accommodate the randi function?
I would not position random as replacing the more specific pseudorandom number generation functions. See the Alternative Functio...

1 month ago | 2

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Answered
Input a variable into a plot title
With the introduction of the string array in release R2016b (and the ability to enclose text data in double quotes to create a s...

1 month ago | 25

| accepted

Answered
I want a Mathworks Polo Shirt
We have now opened the MathWorks Merch Shop. See this blog post for more information.

1 month ago | 1

| accepted

Answered
MATLab promotional items?
We have now opened the MathWorks Merch Shop. See this blog post for more information.

1 month ago | 0

Answered
May I have some Matlab stickers?
We have now opened the MathWorks Merch Shop. See this blog post for more information.

1 month ago | 0

Answered
Wondering if you have any merchandise for sale cause I'd love to look like a part of the MATLAB team 😀
We have now opened the MathWorks Merch Shop. See this blog post for more information.

1 month ago | 2

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