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Steven Lord


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MathWorks

4,423 total contributions since 2002

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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Contributions in
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Answered
matrix component algebra with digraph
R = randi([0 1], 10) D = digraph(R); OD = outdegree(D) R./OD Be careful of the case where one or more of the nodes has outde...

4 hours ago | 0

Answered
objects of one class into another class
Your clwinding class is syntactically valid. Your clloss class, on the other hand, has some conceptual errors. I'm going to mak...

4 days ago | 1

Answered
How to store objects from different classes in one array and call the same function (definitions are different)?
See this documentation page for how to implement your classes so you can create a heterogeneous array. By the way, I recommend ...

4 days ago | 0

Answered
Once I have downloaded R2020a of MATLAB on my windows pc, it won't let me run the application. What could be the issue? (I have uninstalled it and re downloaded it)
If you open the matlab_crash_dump files, there should be a note at the end that tells you how to send that file to MathWorks. If...

4 days ago | 0

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Answered
How can i get an activation key ? the matlab program does not open with out the activation key , please help me to get a solution for this problem? my work based on matlab program
When you bought the software you should have received the instructions and information you'll need to install the software, most...

4 days ago | 0

Answered
How to skip '.' and '..' directory while looping over files in a folder?
You probably don't want to filter just '.' and '..', you probably want to filter all directories. You also shouldn't assume that...

5 days ago | 0

Answered
Error using 'Save' including quotation marks around variables
My guess is filename is a cell array containing a char row vector. x = 1:10; thefile = 'data571924.mat'; save(thefile, 'x') %...

5 days ago | 0

Answered
Not enough input arguments
I suspect you've written or downloaded a sym.m that's taking precedence over the one included in Symbolic Math Toolbox. In my in...

5 days ago | 0

Answered
Best way to present histogram with different realisation number
In the "Plot Multiple Histograms" example on the documentation page for histogram, we show one way to give two histogram objects...

5 days ago | 0

Answered
Polyfit 4th degree unexpected behavior
It looks to me like tp(:, 1) is not sorted. You can check this with issorted. If it's not sorted, MATLAB may draw a line from ar...

5 days ago | 2

Answered
How to set the terminal condition of the Matlab built-in function roots?
You don't. roots builds the companion matrix and computes the eigenvalues of that matrix. I can't see the context before that s...

6 days ago | 0

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Answered
What is the largest number of rows of a matrix that Matlab can handle?
The theoretical limit is the number returned as the second output of the computer function. The practical limit is based on how...

6 days ago | 0

Answered
Creating a built in function?
You cannot add a built-in function to MATLAB like we at MathWorks can. But you can make the MATLAB scripts, functions, and/or cl...

6 days ago | 2

Answered
how to create a table in Matlab ?
In release R2016b (the release with which this answer was marked) table variable names must be valid MATLAB identifiers, which m...

6 days ago | 0

Answered
Appending arrays of different length
Use datetime, hours, and the colon operator : to build your array of dates and times all at once. Note that when doing so you wi...

6 days ago | 0

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Adding a folder when building an standalone application
You cannot have a standalone application run code that was not compiled into the application when it was created. From the docum...

7 days ago | 0

Answered
How can I use some downloaded function?
Where on the MathWorks website did you download the files? If you downloaded them from the File Exchange, I recommend using the ...

7 days ago | 1

Answered
Advice needed with the dateshift function
N = datetime('today') W = dateshift(N, 'dayofweek', 'Wednesday') S = dateshift(N, 'dayofweek', 'Sunday') answer = min(W, S)

7 days ago | 0

Answered
How can I create a Graph with specific coordinates?
When you call plot on your graph you can specify the X, Y, and Z coordinates of the nodes. See the "Custom Graph Node Coordinate...

7 days ago | 0

Answered
findpeak for every column of a matrix
Consider using islocalmax with the dim input argument.

7 days ago | 0

Answered
Why is it the answer from MATLAB is different from the other solving software? Where did I go wrong?
Don't name your variable cond. That already has a meaning in MATLAB. When I used cond1 in the dsolve call rather than cond I re...

7 days ago | 1

Answered
"Function MEMORY is not available on this platform."
As stated in the Limitations section on the documentation page for the memory function, this function is only supported on Micro...

8 days ago | 0

| accepted

Answered
New install: Undefined function 'isstring' for input arguments of type 'char'.
I think you have a fileparts.m that you downloaded or wrote on your path ahead of the one included in MATLAB. When I opened rele...

10 days ago | 0

| accepted

Answered
How can I get only the coefficients that are multiplied by the powers of x? Example: 5x^2 + 9x + 12y + 3z >>> [5, 9]
syms x y z F = 5*x^2+9*x+5*y+3*z [C, T] = coeffs(F, x) C(logical(T ~= 1)) The logical call in the last line may look redunda...

10 days ago | 0

Answered
what is the process of getting campus wide license?
Go to the end of this page. Click the Get Started button and fill in the information requested by the form on that page. Alterna...

10 days ago | 0

Answered
Output truncated. Text exceeds maximum line length of 25,000 characters for Command Window display.
Since I'm guessing you don't really want to read through pages and pages of the result of that command, suppress the display by ...

10 days ago | 0

Answered
too many input arguments in my code!
For your first question, let's split out the innermost function call on that line of code. xr = complex(zeros(fix(waveform.Samp...

11 days ago | 0

Answered
Convert cell array datetime format to double array in HH:MM:SS format
Do you want the numbers as a double array (and if so, what does that double array represent? Seconds since a specific time? Seco...

11 days ago | 0

Answered
R2020a Activation Client for Windows
See this Answers post. If following the steps in that post doesn't resolve the problem, please contact Technical Support using t...

11 days ago | 0

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