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Steven Lord

MathWorks

Last seen: Today 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
How can I get randperm function to calculate assigned percentage and values?
Let's look at a slightly smaller problem. A = zeros(10); numElements = numel(A) numDesired = ceil(0.25*numElements) elements...

environ 3 heures ago | 1

Answered
Can't import matlab.engine for python on M1 MAX chips after I successfully installed the matlab engine.
The page for the MATLAB R2022a Native Apple Silicon Platform Open Beta states, in part, that "MATLAB Engine API for Python is no...

environ 3 heures ago | 0

Answered
How to create answers to a calculation in an array in a forloop ?
Use discretize to generate the index vector then pass those index / group indices into groupsummary as the grouping variable and...

environ 14 heures ago | 0

Answered
How are propagation points connected?
The plot function connects the points you specify with straight lines. As the number of points you plot increase the curve looks...

environ 18 heures ago | 0

Answered
Warning: Imaginary parts of complex X and/or Y arguments ignored.
You probably want to recheck your units, do some dimensional analysis. Note that at the top of the Y axis that 1 unit on the Y a...

1 jour ago | 1

Answered
Creating a variable that denotes a range of values
x = 4*rand(10, 1); edges = (0:0.05:4); y = discretize(x, edges, 'categorical'); results = table(x, y) Or if you want more co...

2 jours ago | 0

| accepted

Answered
why I get the error "function 'lsqcurvefit' not supported for code generation" when using Matlab Coder?
Not all functions in Optimization Toolbox support being converted to C or C++ code using MATLAB Coder. In the most recent releas...

3 jours ago | 1

Answered
One hop nearest neighbor in a graph
Find the neighbors of the node in the undirected graph then compute the distances between the specified node and its neighbors. ...

3 jours ago | 1

Answered
Attempt to grow array along ambiguous dimension. How to fix?
This error occurs when you try to assign to an element beyond the last of a matrix but it's not clear what size the resulting la...

3 jours ago | 1

Answered
how to average a vector of arrays in Matlab
Concatenate them in the third dimension then call mean with the dimension input. M = magic(4) E = eye(4) N = ones(4) C = {M,...

3 jours ago | 0

Answered
Change Node & Edges position on Plot
See the "Adjust Properties of GraphPlot Object" example on this documentation page for a demonstration of how to set custom node...

3 jours ago | 0

Answered
Date and times logic
Let's say you had some sample dates with time components. rng default d = datetime(2022, randi(12, 10, 1), randi(31, 10, 1), r...

5 jours ago | 0

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Answered
Sum block not giving proper output
Even if both the inputs of sum block are having same value as 2 From the result you described apparently the signals are not bo...

5 jours ago | 0

Answered
Plot x^2+y^2=4
Another way to do this is to use the fcontour function. f = @(x, y) x.^2+y.^2; fcontour(f, 'LevelList', 4) axis equal If you...

6 jours ago | 0

Answered
How to make 3 arrays (Test , Test2, Test3) that are of different lengths into one matrix?
Pad. For simplicity I'm assuming the variables you want to concatenate are vectors, but the general idea is the same if you want...

6 jours ago | 1

Answered
How can i use a "list of variablennames" to calculate something?
I have a list that contains all the variables. The approach you described smells a bit bad. Can you dynamically create or refe...

6 jours ago | 1

Answered
Applying within range function
The withinrange function requires its first input to be a timetable, not a datetime array. You probably want isbetween instead.

6 jours ago | 0

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Answered
Calling MATLAB scripts from a MATLAB standalone executable
No. From the documentation "MATLAB Runtime only works on MATLAB code that was encrypted when the deployable archive was built. ...

6 jours ago | 0

Answered
Matlab App Designer displays an array of numbers when the variable in question is a double
Instead of using an EditField (whose Value property is the text the user entered in the field according to the documentation) yo...

6 jours ago | 0

| accepted

Answered
Speeding up fread for random position in big file
Since your data is Big Data (too large to fit in memory all at once) you may want to investigate creating a datastore for your f...

7 jours ago | 0

Answered
Unit test code coverage
Add matlab.unittest.plugins.CodeCoveragePlugin to your test runner as shown on this documentation page.

7 jours ago | 0

Answered
How to use File exchange
Instead of manually downloading the File Exchange submission try using the Add-On Explorer to have MATLAB automatically download...

7 jours ago | 0

Answered
matlab installer key is not working what to do ?
Please create a service request and work with the Technical Support team to determine why the installer is not performing as exp...

7 jours ago | 0

Answered
Checking if columns of matrix are equal to some array
Transpose the matrix and use ismember with the 'rows' option. rng default x = randi([0 1], 10, 3) candidate = [1 0 1] isItPr...

9 jours ago | 2

Answered
out of memory error
The maximum number of rows you can have in a matrix in MATLAB is the second output of the computer function, and you're unlikely...

9 jours ago | 0

Answered
Import data into datetime format
Consider opening the file in the Import Tool. Using this tool you can interactively adjust how MATLAB imports each column of you...

9 jours ago | 0

Answered
How to generate a multi-dimensional array from a vector ?
Let's make the 5-by-5-by-5 multiplication table. x = (1:5).'; maxdim = 3; % Initialize the result to the vector itself res...

9 jours ago | 2

| accepted

Answered
Why the result in curve fitting tool shows a different graph in plot?
The values that are displayed are not the same as the values that are stored in the object. The displayed values only show four ...

10 jours ago | 1

| accepted

Answered
What is the difference between backward slash vs forward slash in MATLAB?
A=[4,12;6,8]; b=[6,12;14,8]; From the documentation for mrdivide, /, if x = A/b then x*b should be close to A. x1 = A/b chec...

10 jours ago | 2

Answered
retime different variable for different methods
Looking at the documentation page for the retime function, the description of the method input argument states that it must be "...

10 jours ago | 0

| accepted

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