Community Profile

Steven Lord


The MathWorks

12658 total contributions since 2001

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 the MATLAB Newsgroup 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 can I add serial date and time for each 12 min ?
Take a look at <https://www.mathworks.com/help/matlab/matlab_prog/generate-sequence-of-dates-and-time.html this documentation pa...

19 hours ago | 0

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Answered
Polarplot plotting a single point not a line
In your first case, you've given it one value for rho and one for theta. [I'm assuming the "theater" on the third line is a typo...

21 hours ago | 1

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Answered
Define a handle function into another one
On this line: ParEaa = @(Oma) pi.^(-1).*J./(Oma.*(Oma + De)); you need to evaluate the function handle J and use the val...

1 day ago | 1

Answered
String manipulation (change of a string in a loop)
Don't think of it as changing a variable name. Think of it as changing which element of the vector you modify. base = [1 2 ...

2 days ago | 0

Answered
Error 'Not enough input arguments'
You need to pass a value into the function, since the function is defined to accept an input argument u.

2 days ago | 0

Answered
How can I insert the *contents* of a string variable directly into my code?
Use the |system| function instead of the |!| operator. comment = 'Hello world!'; % leaving off the semicolon on the next...

2 days ago | 1

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Answered
Error using inline/subsref (line 14) Too many inputs to inline function.
The way you've described the problem, it sounds like whatever is invoking the |inline| object will pass 2 inputs into df, but wh...

2 days ago | 1

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Answered
Matlab 2013a is unable to find the JDBC driver using the database explorer App. I followed the instructions here. https://de.mathworks.com/help/database/ug/postgresql-jdbc-windows.html#bt8koan-2
That documentation page is for the most recent release, currently release R2016b. I don't know how much Database Toolbox has cha...

2 days ago | 0

Responded


Re: Uncomment shortcut on Matlab
You asked this question earlier, and James Tursa and I responded in that thread. http://www.mathworks.com/matlabcentral/newsrea...

3 days ago | 104 views

Answered
How do I add column vector to a matrix ? Documentation examples does not work.
<http://blogs.mathworks.com/loren/2016/10/24/matlab-arithmetic-expands-in-r2016b/ Implicit expansion> was added as a feature in ...

3 days ago | 0

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Responded


Re: Uncomment shortcut on Matlab
Those are the shortcuts in the Windows Default Set but I don't remember if they are the same in the Mac Default Set. But even th...

3 days ago | 199 views

Answered
what is the system requirement for matlab R2010
None of release R2010a, R2010b, R2010b Service Pack 1, or R2010b Service Pack 2 list Windows Server 2012 in their Windows system...

3 days ago | 0

Answered
why I got error in MATLAB 2012a " Undefined function or variable 'p'. The first assignment to a local variable determines its class."when i run my code?
The variable p isn't defined the first time you try to use it in your function, on the line "p = p+1;". What exactly do you thin...

4 days ago | 0

Responded


Re: I need to know how to find where a function ends.
snip* The error message you cited means that there is a set of inputs that never executes a line that defines one or more of th...

4 days ago | 182 views

Answered
How to plot a series on a graph from a specific time
Generate some sample data. x = 1:10; y1 = x.^2; y2 = abs(50-y1); Plot the first line and turn |hold| on to allow c...

4 days ago | 0

Answered
Where are the functions saveCompactModel / loadCompactModel?
According to the notes at the bottom of their online documentation pages, these two functions were introduced in release R2016b....

4 days ago | 0

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Answered
What should be adjusted to make the script run?
Variable names cannot contain spaces. "k_member _ 1" (where the quotes are simply to denote the start and end of the name, but a...

4 days ago | 2

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Answered
silent installation 2016b - do not have a File Installation Key (yet) (license changed)
Please contact your license administrator (probably someone in your IT department) and/or MathWorks Technical Support (using the...

4 days ago | 0

Answered
While using class method to create an object: "Base object for class 'Test_class' constructor is invalid".
You cannot define a class using the older class syntax (where you call the |class| function inside the class's constructor _func...

4 days ago | 1

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Answered
save the output of system command using matlab
Use concatenation or |sprintf| to assemble a command for use with the |system| function that needs to include information from a...

4 days ago | 0

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Answered
can you assist in designing a proactive supply chain for the beverage industry?
Take a look at <https://www.mathworks.com/services/consulting/proven-solutions/operations-logistics-supply-chain-management.html...

4 days ago | 0

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Answered
Code checking messages are displayed as grey boxes without text
Take a look at <https://www.mathworks.com/support/bugreports/1229653 Bug Report 1229653>.

5 days ago | 1

Answered
Graph::bipartite?
That function only works inside the MuPAD Notebook interface, not inside a MATLAB function or at the MATLAB Command Prompt [*]. ...

5 days ago | 0

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Answered
License association to account trouble
As the message suggests, "Please contact your license administrator for assistance." If you're not sure who your license admi...

5 days ago | 0

Answered
Why I can't run the corrcoef for matrix
You can't compute the correlation coefficient of a |table| since a |table| could contain non-numeric data. Instead, you can comp...

6 days ago | 0

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Answered
cputime not working as expected
From <https://www.mathworks.com/help/matlab/matlab_prog/measure-performance-of-your-program.html this documentation page>: "The ...

6 days ago | 0

Answered
For some strange reason MATLAB spits out two answers to the following code , pay2 =, and p =. It is ony supposed to produce 1 answer
You have several lines inside the |elseif| sections of your code that do not end in semicolons. Add the semicolons at the end of...

6 days ago | 1

Answered
How Matlab computes trigonometric functions?
You may be interested in <https://www.mathworks.com/company/newsletters/articles/the-tetragamma-function-and-numerical-craftsman...

7 days ago | 1

Answered
I am running tracker code in matlabR2013b, it is working properly. But when i try the same code in MatlabR2015b it is giving following error..not able to debug it..any help..thanks in advance...
In releases prior to release R2014b <https://www.mathworks.com/help/matlab/graphics-changes-in-r2014b.html graphics handles were...

7 days ago | 0

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Responded


Re: help on function
Based on the name of the outputs and inputs, I assume you intend to use this function for a call to one of the ODE solvers. In o...

12 days ago | 229 views

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