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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
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 ...

5 hours ago | 0

Answered
save() seems to be saving objects that should be destroyed, causing errors when the resulting .mat file is loaded
txs = txsite("AntennaHeight",1.5, ... "Latitude", 38.9899587, "Longitude", -76.9353889, ... "Transmitt...

1 day ago | 0

Answered
Optional Arguments in Function as Struct Input
Use the namedargs2cell function.

3 days ago | 0

| accepted

Answered
How do I include a command line in my app when using MATLAB Compiler?
No, you cannot include the Command Window in your deployed application. Since you mention App Designer and "change directories",...

3 days ago | 0

| accepted

Answered
how can i open .lod extension and .iqd extension file in matlab?
That depends. What do those files represent? Looking at a file extension database a file with the extension .lod could be from: ...

3 days ago | 0

Answered
Loading user-defined classes from .mat files absent the classdef
At one time, if I had a .mat file with a user-defined class variable, but lacked the classdef file, loading the .mat file would ...

9 days ago | 0

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Answered
where can I find the code?
Go to the webpage or documentation page for the example that calls that function. Use the button to open that example inside MAT...

12 days ago | 0

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 ...

28 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...

1 month 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 ...

1 month 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

1 month 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...

1 month 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...

1 month 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...

1 month 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...

1 month 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...

1 month ago | 0

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

1 month ago | 0

| accepted

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] ...

1 month 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...

1 month 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...

1 month 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...

1 month 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...

1 month 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...

1 month 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 ...

1 month 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...

2 months 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 ...

2 months 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...

2 months 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...

2 months ago | 0

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

2 months 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, ...

2 months ago | 1

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