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Steven Lord


MathWorks

3.365 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 do I get my license and activation key
If you purchased MATLAB from the online store, I believe you should have received an email with instructions on how to download ...

etwa 3 Stunden ago | 0

Answered
How to fill a graph exclusing given points?
Let's make a random (well, not so random, more arbitrary) polygon. A = nsidedpoly(5, 'Center', [1 1], 'Radius', 2); If you wan...

etwa 4 Stunden ago | 1

| accepted

Answered
Extreme points finding from set
I suspect some combination of islocalmin, islocalmax, and/or ischange will identify the points you've called out with + markers ...

etwa 22 Stunden ago | 0

Answered
fill a polygon with a hole
Consider creating and plotting a polyshape. You will receive a warning but depending on how you've generated your data you may b...

etwa 23 Stunden ago | 0

Answered
How to unfix the seed with Matlab engine?
Every time you call matlab.engine.start_matlab you're starting a new MATLAB process. See this documentation page for how to "Gen...

etwa 23 Stunden ago | 0

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Answered
How to generate -1, 0 and 1?
If you want to map ranges of values in your original data to the values -1, 0, and 1 you could discretize your data. Use the syn...

etwa 24 Stunden ago | 0

Answered
How to control the randomness of algorithm
See the three topics in the "Control Random Number Generation" section on this documentation page.

ein Tag ago | 0

Answered
round off problem in matlab
Based on that display I suspect one or both of the variables zcdOut or slope_count are stored in an integer class. When you comb...

ein Tag ago | 0

Answered
HOW to download 2019b iso disc image
As per this message if you are a licensed end user you will need to ask your license administrator to download it.

ein Tag ago | 0

Answered
I cannot open the following tutorial in R2018a version. Photovoltaic Thermal (PV/T) Hybrid Solar Panel
This example was introduced in Simscape Electrical in release R2019b, according to the Release Notes. It doesn't exist in earlie...

ein Tag ago | 0

Answered
Banded Matrix Solver in Matlab
Since you've tagged this question with "sparse", try just using the backslash operator. The flowchart on that documentation page...

2 Tage ago | 1

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Answered
accuracy problems in uint64 numbers
It really depends on how you performed your computations. Let's take a somewhat large number, 3^40. xDouble = 3^40; xUint64 = ...

2 Tage ago | 0

Answered
PLOT THE GRAPH OF VECTOR FUNCTIONS
If you have a picture in your mind of how you want the graph to look, open the Plots tab in the Toolstrip and click the triangle...

2 Tage ago | 0

Answered
Convert table and obtain column values
Use ismissing to locate the missing values (you can tell ismissing what it should consider as a missing value) then use the logi...

2 Tage ago | 0

Answered
What is the best way to insure that all of my functions are using the same constant values?
You could define a class with Constant properties. classdef myconstants properties(Constant) g = 9.8; g_...

3 Tage ago | 4

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Answered
can I return more than one argument in the "odefun" when called from ode45
What you've described sounds not like an ordinary differential equation (ODE) but like a delay differential equation (DDE). This...

3 Tage ago | 1

Answered
Find specific date/time from a series of datenums
If you're going to be doing a lot of processing of this data based on the times, consider turning your column of date numbers in...

3 Tage ago | 0

Answered
Undefined function or variable 'ranova'
The only ranova function I see in the documentation is this one. In order to call this function, the first input must be a Repea...

3 Tage ago | 0

| accepted

Answered
Write class methods outside the class file
Rather than defining the class methods in the classdef file to call a separate function, I'd just define them in a separate file...

4 Tage ago | 1

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Answered
Event function with multiple events
When you define your options structure with: option2 = odeset('Events', @comp); the ODE solver will call your Events function ...

4 Tage ago | 0

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Answered
Extract Variable/column with variable name from table
In what form do you want the extracted variables to be stored? A = magic(4); T = array2table(A) % Variable names A1 through A4...

4 Tage ago | 0

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Answered
Roots function is solving eigth order polynomial equation as fifth order.
Specify the 'All' option in your call to coeffs to return all the coefficients, even those that are 0.

6 Tage ago | 0

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Answered
Separate out every fourth element of a Vector
If by " so you have to make it clear that this is not the intention." you mean you don't want to delete every fourth element but...

7 Tage ago | 0

Answered
Create variable from an excel entry
Are you required to store this data in an Excel spreadsheet? I'd prefer storing this in a plain text file. Plot.Shift=20; Plot...

7 Tage ago | 0

Answered
how to catch when a figure was minimized
Make the figure window 'fullscreen'? f = figure('WindowState', 'fullscreen');

8 Tage ago | 0

Answered
Comparing Duration Arrays is time consuming - How to improve my script?
So you want to extract only those subset of rows of your data that fall into a certain time span? If so, and if you choose to st...

8 Tage ago | 0

Answered
Changing data from long form to short form
Participant_ID = [1; 1; 1; 2; 2; 2]; Trial = [1; 2; 3; 1; 2; 3]; RT = [342; 346; 534; 242; 131; 531]; t = table(Participant...

8 Tage ago | 2

Answered
Count how many elements are present inside arrays
V= [1 2 3 4 7 8 9 10 11 12 14 16 17]; P = [1 2 3 4 7 8 9 10 11 12 14 16 17 2 7 9 11 12 3 1 10]; F = [1 2 3 4 7 9 10 11 12 14 ...

8 Tage ago | 0

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