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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What is Mathworks Service Host?
See this Answers post.

3 hours ago | 0

Answered
dsolve function is not working
You've written your own dsolve.m file that's taking precedence over the dsolve function that is part of Symbolic Math Toolbox. I...

9 hours ago | 0

Answered
Requesting theoretical support for interdigital capacitor function
Do the reference books/papers in the References section of the documentation page for the interdigitalCapacitor function not inc...

10 hours ago | 0

Answered
Random sequency generation at specific numbers
Replicate the vector so it has more elements than you want. Then use the two input form of randperm to select the desired number...

1 day ago | 0

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Answered
xtick label font change affect ytick label font
Changing the FontSize property of an axes does affect the font size of both the X and Y rulers. If you get the ruler you want to...

2 days ago | 0

Answered
I want to gererate pseudorandom integers using randi function, however I want have empty cells between the integers.
Numeric arrays in MATLAB can't have "holes". Perhaps if you describe in more detail how you're hoping to use this type of array...

2 days ago | 0

Answered
Mackey Glass equation and ddesd
So in these equations you're using the Equation 2 form where is 2, is 1, n is 9.65, is 2, and is 1? If the density of the c...

2 days ago | 0

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Answered
Matlab License File Precedence
That is what the MATLAB License Search Path section on this documentation page states.

2 days ago | 0

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Answered
How to doc() a command which is overloaded by multiple toolboxes
The evaluate function in both those products (and a few others) is a method of different types of objects. which -all evaluate ...

2 days ago | 0

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Answered
I can not open spm12 with MATLAB
SPM12 is not a MathWorks product and so I don't have any experience with it, but based just on the error message and the URL of ...

3 days ago | 1

Answered
Run Section funcionality isn't working
In order to run MATLAB code in a code file, the name of that file must satisfy the requirements given by the isvarname function....

3 days ago | 1

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Answered
S-Function support for future releases
The Release Notes for Simulink Coder in release R2022b includes an entry that seems to be relevant to this question. The suggest...

3 days ago | 0

Answered
remove numbers of an matrix from another matrix
Call setdiff with the 'rows' input.

3 days ago | 0

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How can one debug mex code called by fminsearch?
What happened after you handled the SIGSEGV and SIGBUS signals as described in the last section, "Debug MEX with JVM", on this d...

3 days ago | 0

Answered
my optimization toolbox does not open
If you're referring to optimtool, it was removed in release R2021a. For a graphical interface to the Optimization Toolbox functi...

4 days ago | 1

Answered
how change order color legend?
If you're using release R2023b or later, there's a new legend property introduced in R2023b that may be of interest to you. Chan...

5 days ago | 0

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Moving skewness/kurtosis/rms/autocorrelation for time series. Fast Implementation.
Currently MATLAB does not have any functions for computing the moving skewness, kurtosis, rms, or autocorrelation. For a list of...

6 days ago | 0

Answered
How to take a value between two values
If you hover over the underlined <= operators in the code in the MATLAB Editor, you will see a Code Analyzer message explaining ...

7 days ago | 0

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When is the official release for MATLAB for Silicon Macs?
It is currently: datetime('now', TimeZone="local", Format = "dd-MMM-yyyy hh:mm:ss a z") and the Release Notes indicate that re...

8 days ago | 0

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lambr0 and zeta0 outputting 1x1 answer when I want them to output 1x7 answer, any suggestions?
In addition to using element-wise power (the .^ operator) and element-wise multiplication (the .* operator) you need to use the ...

9 days ago | 0

Answered
Matlab Service request and bug inaccessible
I don't see any outages listed on the Application Status page. When I tried connecting via Microsoft Edge I was able to access t...

9 days ago | 0

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Answered
standard deviation takes for ever
Can you confirm you're using the std function included in MATLAB? What does this command show? which -all std

9 days ago | 0

Answered
Convert the contents of C:\WINDOWSSYSTEM32\cmc into a text file and open in Matlab
I'm guessing your actual question is not about decompiling one of the executables included with Microsoft Windows into its sourc...

10 days ago | 1

Answered
transform exponential number to decimal
Use a different format specifier. The second column of your data doesn't contain integer values, so using %d for that column is ...

10 days ago | 1

Answered
how to get the correct plot of function sin(N+1)*pi*x^2/sin(pi*x)^2 with different N
To eliminate the effect of the floating point approximation to , try using sinpi instead of sin. % Define the value of N forma...

11 days ago | 1

Answered
Live script 'edit field' control option not available
The ability to add an edit field Live Editor Control was added in release R2019a. You will need to upgrade to that release or la...

13 days ago | 0

Answered
how to visualize histogram with Datatime on Axis
You can call histogram with datetime data as the data to be binned. Let's make some random data for the first half of today to u...

14 days ago | 0

Answered
How to load an object of class 'sym' in a .mat file
Do you have Symbolic Math Toolbox installed? If you don't, you won't be able to load sym objects created with the sym or syms fu...

15 days ago | 0

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If statements vs conditions
Esim4=Esim4.*(Esim4>=0); % make sure the difference is never below zero I likely would just call the max function on Esim4 ins...

15 days ago | 0

Answered
How to obtain curve fitting tool startpoints using code? Replicate Curve Fitter Toolbox
Under certain circumstances (when the Method is NonlinearLeastSquares and you're using certain library models) MATLAB uses heuri...

16 days ago | 0