Steven Lord

Last seen: Today

MathWorks

5,401 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 would I perform logical comparisons with times given in the form of a string vector?
% time = datenum(temptime); Instead of converting the dates and times to serial date numbers, I recommend converting them to a ...

1 day ago | 0

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actxcontrol and actxserver: Future support plans?
1. Is there an announced time-frame for removing the actxcontrol( ) command? If you're looking for something more concrete than...

2 days ago | 1

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Error being printed "Error using sym>convertChar (line 1557) Character vectors and strings in the first argument can only specify a variable or number. To evaluate character vectors and strings representing symbolic expressions, use 'str2sym'."
You could use str2sym as the error message suggested, but instead I would use one of the approaches shown on this documentation ...

2 days ago | 0

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Split Table data based on Day Names
Do you want to have seven individual variables or do you want to operate on the set of rows in your table data where each row in...

2 days ago | 0

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How can I fix the problem of deep network designer in MATLAB?
Which release of Deep Learning Toolbox are you using? If you're using a release prior to R2019a I suspect though I'm not certain...

2 days ago | 0

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Passing structs/objects to functions
Just because MATLAB passes a large array into a function doesn't mean it needs to make a copy of that array if you don't modify ...

2 days ago | 0

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Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.
for 1=1:n, The number 1 is not a valid variable name in MATLAB and so cannot be used as the loop variable in a for loop.

2 days ago | 0

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How to open Matlab with specific scripts in my editor?
Consider setting up different Projects for your different projects.

3 days ago | 0

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How to replace specific values to all values of a bin ?
Specify the values input argument in your discretize call. x = 6*rand(10, 1); d = discretize(x, 0:2:6, [1.6, 3.8, 5.7]); resu...

3 days ago | 3

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Nested structs and objects - do or don't?
Off the top of my head I'd probably use a three tier approach, something along the lines of the following untested code: classd...

3 days ago | 0

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resampling to avoid limit - nchoosek
Assuming VID1 has 429 elements and Hcombos has 36 rows, that means you're trying to generate one of this many combinations: N =...

4 days ago | 0

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how to define a variable with dates
Adapt the example on this documentation page. It won't require a lot of modification.

4 days ago | 0

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Feature Matching in MATLAB
Break each of those steps into sub-steps. Repeat step 1 until you've broken each step into sub-steps that you are able to imple...

5 days ago | 0

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Answered
Hi, I want to write a code that locates the nth value of matrix x= [2,4,6,8,10,12,14,16,18,20] where n is [1:10]. How could I write that?
That's basic linear indexing. See the "Indexing with a Single Index" section on this documentation page for more information. x...

5 days ago | 0

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Inconsistency of angle function in finding angle of vectors
Typing the command angle(1+i) yields an angle of 45 degrees, No it doesn't. It returns the equivalent angle in radians, however...

6 days ago | 0

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Comparative Operator result is wrong
Two numbers that are displayed the same may not represent the same stored value. See this Answers post for more information abou...

6 days ago | 0

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How to clear a TestCase class from memory?
You may find this new feature introduced in release R2021a useful.

9 days ago | 1

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How to get mean of all variables in a table?
The varfun function requires one of its inputs to be a table or timetable array (or a tall table or timetable.) which -all varf...

9 days ago | 1

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Graphplot nodes How to ensure generating only existing nodes.
S=[1 30]; T=[2, 1]; D1 = digraph(S, T) % use S and T as node numbers, 30 nodes plot(D1) D2 = digraph(string(S), string(T))...

9 days ago | 0

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Answered
Error using inlineeval (line 14)
Do not use inline. We first marked it "not recommended" somewhere between 15 and 20 years ago if I recall correctly. Just opera...

10 days ago | 1

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"Array indicies must be positive integers" error
The first element / row / column / etc. of an array in MATLAB is element / row / column / etc. 1. There is no element / row / c...

10 days ago | 0

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Why I can't use keywords "AutoFitWidth" for writematrix() in MATLAB R2020a?
That functionality was added in release R2020b.

10 days ago | 0

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How can I fix this error?
Where in your code do you define a variable named i? If the answer is some form of "nowhere" or "I don't" then MATLAB will call ...

11 days ago | 0

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Modifying variables in properties(TestParameter) of the unittest class
You can define a class-related function at the end of the file, after the end that matches the classdef keyword, that returns th...

11 days ago | 0

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Object oriented programming - Constructor behavior
Because class constructors are special. MATLAB knows exactly which method in a class is the class constructor (it has to have th...

11 days ago | 0

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Answered
Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.
function plottransect(1) As stated on this documentation page "If your function accepts any inputs, enclose their names in pare...

11 days ago | 0

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random number generator rng performs differently on compiled binaries (in Linux)
In your application, does the user call your function with the seed value that you pass into rng? x1 = myfun(42) x2 = myfun(99...

11 days ago | 0

Answered
Need assistance in fitting tool
"2pi" is not a valid way to write 2 in MATLAB. y = 2*pi

11 days ago | 0

Answered
Betweenness Centrality for a vertices in an adjacency matrix
Since this question was asked we have added the graph and digraph objects to MATLAB. Use one of those functions to create an obj...

12 days ago | 0

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How to quote variables whose names are in order in a for loop?
See if some of the tools in MATLAB for working with data that is too large to fit in memory on one machine all at once will sati...

12 days ago | 0