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Steven Lord


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MathWorks

4,188 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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Answered
How to solve an ODE system with time-dependent variables in MATLAB?
From your description, it sounds like you don't have an ordinary differential equation (ODE) but you have a delay differential e...

1 hour ago | 0

Answered
Working with Matlab for a 15! x 30 matrix
To speak to some of the questions Image Analyst asked, how large a contiguous block of memory would storing this matrix require?...

1 hour ago | 0

Answered
matlab space error problem
You can use concatenation as Fangjun Jiang and Brent Kostich suggested. I'd probably use join instead. join(["I", "love", "Geor...

1 hour ago | 0

Answered
FZERO requires at least two input arguments
I have a number of pieces of feedback on this code. It looks like it was written for an older version of MATLAB and was copied i...

6 hours ago | 1

Answered
Ranking Variables by Value
You've made this a bit harder on yourself than it needs to be by defining individual variables for the counts and prices of each...

1 day ago | 1

Answered
Matlab R2016b
My suspicion is that your images folder contains no JPG files. If it doesn't, your for loop does not execute its loop body and t...

1 day ago | 1

Answered
Should mvnrnd Always Advance the State of the Global Stream
There's no requirement that these two lines of code that call the same function with different inputs need follow identical code...

2 days ago | 0

Answered
no function called predict although stats toolbox is downloaded
There are several different functions named predict in Statistics and Machine Learning Toolbox. Each is for a specific type of o...

2 days ago | 0

Answered
classes and the "set" method
Make X a Dependent property in class Dummy and make its get.X method compute the value of X using the current value of the av pr...

2 days ago | 0

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Answered
How do I define an empty table of unknown size?
Elements = 1:5; n = numel(Elements); T = table('Size', [2 n], 'VariableTypes', repmat("string", 1, n))

3 days ago | 0

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Answered
nmrval returning larger matrix than expected.
Does your X matrix contain a column of 1s? If so see the Note in the first item of the Description section on the documentation ...

3 days ago | 0

Answered
Plotting the ODE without an analytical solution
If your initial conditions are supposed to be: "where x(0)=0.2 and x'(0)=0 for t=0:100?" why are you specifying them as x(0) = 0...

3 days ago | 0

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Answered
How to write Matlab code based on the Simpson’s 1/3 rule?
When you ask for help understanding / correcting an error, please include the full and exact text of that error message (all the...

4 days ago | 0

Answered
How to get License number for online MATLAB if MATLAB is not installed?
The first ways I'd try to locate the license number would be to check the installation instructions you should have been sent (i...

4 days ago | 0

Answered
I have Symbolic Math Toolbox but get an error with syms, why?
The function you've written or downloaded named syms.m in your OneDrive is shadowing the syms function that is part of Symbolic ...

4 days ago | 0

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Answered
How to do basic time arithmetic when NaNs are involved
Replace the NaN numeric values in your date cell arrays with 'NaT' and the NaN numeric values in your time cell arrays with 'NaN...

4 days ago | 0

Answered
what should I do
load your data into MATLAB then see the "Indexing with Logical Values" section on this documentation page.

4 days ago | 0

Answered
How to install 2019a Navigation Toolbox?
As shown on the documentation page listing the release notes for release R2019b (the New Products and Major Updates section) Nav...

6 days ago | 2

Answered
How can I make the MarkerIndices automatic?
h = plot(1:10, 1:10, 'o-'); % Eliminate half the markers h.MarkerIndices = 1:2:10; % Change the number of points. No new ...

6 days ago | 0

Answered
how to download,install a toolbox on existing matlab on linux without GUI(command-line),I want to install Audio toolbox on MATLAB 2017a ?
Review this documentation page for how to download products without installing (which can be done on a different machine than th...

6 days ago | 0

Answered
Why doesn't my matlab have deepNetworkQuantizer app?
My guess is that you haven't installed the support packages listed on the first documentation page to which you linked. "Quanti...

6 days ago | 3

| accepted

Answered
Executing a "for" loop, but getting "array indices must be positive integers or logical values" error
What values does your loop variable take on when you use the code as you've written it? y = [2.903E-04, 7.538E-05, 2.525E-05, 2...

6 days ago | 0

Answered
How to solve ODE in which one variable depends on precedents variable states
It sounds like you don't have an ordinary differential equation (ODE) but a delay differential equation (DDE.) If that's the ca...

6 days ago | 0

Answered
Write a function that finds all the Three Pythagoras less than n?
Hint: how many times do these two loops run their loop bodies, and for which values? y = 5; disp('k1') for k1 = 1:1:length(y)...

6 days ago | 0

Answered
When is Matlab going to offer a colored chart
Rik is correct that we generally do not discuss whether or not we're working on a particular piece of functionality without an N...

6 days ago | 1

Answered
how to combine date and time in single column
In what data type is your data stored? If it's stored as char vectors then you can use the functions KSSV mentioned in the comm...

6 days ago | 0

Answered
need to remove some time or make time
Use logical indexing. The relational operators like <= and > work on datetime arrays. tid = datetime(2015,1,1,00,00,00):hours(1...

6 days ago | 0

| accepted

Answered
& operator without if
The & operator is an elementwise operator. Just like the + operator will add corresponding elements of its inputs when given two...

7 days ago | 1

| accepted

Answered
mate version in matlab r2012b
Google didn't find any hits for "MATLAB Analysis Tools Environment" (with the quotes) and found way too many hits (about 27.6 mi...

7 days ago | 0

Answered
Matlab Release Update Notification
If you look in the upper-right corner of the MATLAB Deskop you should see an icon of a bell. When a new Update for the release y...

7 days ago | 0

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