Steven Lord

MathWorks

Last seen: 1 día ago | Active 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
ifelse and switch don't match
Based on your prose description, it sounds like your underlying task is to populate the matrix Re21 based on the contents of the...

1 día ago | 0

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Answered
Converting cell of numbers to double
If the cells in that cell array in the upper-right cell of your outer cell array can be concatenated to form a matrix you could ...

1 día ago | 0

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Answered
Is exp() a Documented Function in the Symbolic Math Toolbox?
There is no separate documentation page for the exp method for sym objects, this is true. Not all methods of classes have docume...

2 días ago | 1

Answered
Is SeriesNetwork a class defined in the Deeplearning Toolbox?
Is it so Yes, SeriesNetwork is part of Deep Learning Toolbox. You can see this from "breadcrumbs" in the left frame on its docu...

2 días ago | 0

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Answered
How to create a matrix with special block diagonal structure
n = 8; c = cell(1, n); for k = 1:n c{k} = tril(ones(k)); end B = blkdiag(c{:}); spy(B)

4 días ago | 1

Answered
variable number of if condition
Use discretize to determine into which bin each of your data sets belongs. Then you could use groupsummary, grouptransform, a si...

4 días ago | 0

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Answered
Change the value of a variable generated by app designer
Rather than creating 30 variables or 30 properties in the app, I would create a vector that can contain 30 edit box handles and ...

4 días ago | 1

Answered
What is the recommended way to pass long list of parameters between main workspace and function?
If all your variables are related and so should remain together, I would pack them into a struct array. s = struct('a1',1,'a2',...

5 días ago | 2

Answered
How to disable Matlab 2022a breaking rows in command window?
This is a bug in release R2022a when MATLAB is started with the -nodesktop startup option. I've alerted the appropriate developm...

5 días ago | 1

Answered
Toolboxes installation in MATLAB beta for Native Apple Silicon
As stated on the page to which you linked: "The open beta includes MATLAB only. Simulink and toolboxes are not available."

6 días ago | 0

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Answered
Algorithm conversion to Matlab Code
See this post on Cleve Moler's blog.

7 días ago | 0

Answered
cumulative sum table over group
Take a look at the grouptransform function.

9 días ago | 1

Answered
Operator '*' is not supported for operands of type 'function_handle'.
b=0.4;c=11;d=6;e=130;f=10;m=1; % ... f = @(t,x) [a*x(2)+(0.2+0.2.*abs(x(4))).*x(3);b*((x(4).^2)-13).*x(3)-c*x(2);-d*x(1)-e*x(2...

9 días ago | 0

Answered
Automatic numbering and cross-referencing of sections in Live Script
Cross references: the Hyperlink entry in the first table on this documentation page indicates you can link to another location i...

9 días ago | 0

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Answered
How to delete a Matrix in a 3D Matrix?
Let's make a sample 3-D array with some NaN values. A = randi(10, 3, 3, 4); A(randperm(numel(A), 3)) = NaN % Make 3 random val...

10 días ago | 0

Answered
picking a random number in a range
Do you want a random integer value or just any old number between 1 and 69? The next time you draw a random number, are you goi...

10 días ago | 0

Answered
Can anyone help me with this in matlab
if you could help me with the link between the days and the temperature per example Okay, so you need help assembling the vecto...

11 días ago | 0

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Answered
Why does lu function yield different lower triangle matrix if I return [L,U] rather than [L, U, P]?
From the documentation page for the lu function: "[L,U] = lu(A) returns an upper triangular matrix U and a matrix L, such that ...

11 días ago | 0

Answered
Readtable is not reading my delimiter and datetime columns correctly
You might want to use the interactive Import Tool to read in your data. This will let you select how the data is delimited / sep...

11 días ago | 0

Answered
Performing calculations for specific values in a table defined by certain values from another column (Date)
Since you have time-based data I'd store it in a timetable array instead of a table array. If you do, you can use retime to aggr...

11 días ago | 1

Answered
How can i display a vector on Matlab that does the follwing
I suspect this may be part of a homework assignment so I'm not going to give you the answer. But I believe the section on "Vecto...

11 días ago | 0

Answered
readtable() custom variable names
If you're using release R2020a or later I would use the renamevars function.

11 días ago | 0

Answered
Function inside the function
r=@(s,z) sqrt((s+s0).^2+(z+z0).^2); I'm assuming you've defined s0 and z0 before you run this line to define r. Ds=@(r,s)(c0x+...

11 días ago | 1

Answered
Extend a cell array of dates (from days only, to hours and days) in a compact way
I'd probably take advantage of implicit expansion for datetime and duration arrays, introduced for those types in release R2020b...

11 días ago | 0

Answered
Is there an official page that gives the MATLAB and associated/compatible Simulink version numbers ?
Since you're asking about compatibility, version numbers are not the right tool to use. The supported workflow is to use the ver...

11 días ago | 0

Answered
Can I define a specific method to run upon loading obj from mat file?
From the documentation section talking about how to customize object saving and loading, overload the loadobj method.

12 días ago | 0

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How to calculate inverse of 3d array matrices with size 3*3*18 ?
If you're using release R2022a or later you could use the pageinv function. But if you're planning to invert these matrices in o...

12 días ago | 1

Answered
Dear Sir,There are only limited options or tools in trial version of librarires of R2022a trial version
I suspect that most if not all of the blocks you're trying to use are part of Simscape Electrical. Check the output of the ver f...

12 días ago | 0

Answered
How to save figures using mkdir if paths are variables?
Functions in MATLAB that accept text data can be called in one of two ways: command form or function form. Let me show you each ...

12 días ago | 1

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Answered
Using stem plot for two plots
This looks like a reasonable plot to me. T=4e-3; n=21; x=linspace(0,T/2,2001); x1=linspace(T/2,T,2001); y=sin(pi*x/T); y1=(...

12 días ago | 0