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Steven Lord

MathWorks

Last seen: Today Attivo dal 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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Risposto
How do I convert "DateStrings" that are formatted differently to "datetime" in MATLAB R2022a?
Convert all the date strings using the format appropriate for the first date string. dateStrings = ["2024-03-04 14:27:12.1"; "2...

circa 13 ore fa | 0

Risposto
In Matlab AppDesigner -> Generation of a Report with a Word Template: Problem with Input Arguments for function 'Document'
The mlreportgen.dom.Document Class is in the mlreportgen.dom namespace. What did you import? import mrlreportgen.dom.*; You ha...

circa 19 ore fa | 0

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why is not equal
Rather than converting from degrees to radians and then computing the sine of the angle in radians, why not just use the sind fu...

1 giorno fa | 0

Risposto
How can I Integrate on an array with respect to another array
To integrate data sets use the trapz or cumtrapz functions. If you had functions to integrate use the integral family of functi...

1 giorno fa | 0

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Risposto
if-statements for reassigning values
Let's look at the exact text of the error you received. N=randi([-100,100]); if N=[-20,20] N=N*2 else if N>20 N...

6 giorni fa | 2

Risposto
Have the nnd4db command been removed for 2023b
I believe that command was part of an old demo that was removed from Deep Learning Toolbox in release R2023b. Looking back at t...

6 giorni fa | 0

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Risposto
ANY and ALL with NaN array
Not a bug. On that documentation page, the description of the A input argument states in part "The any function ignores elements...

6 giorni fa | 0

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Risposto
How to create separate data for daylight hours and nighttime hours in MATLAB?
Since the timestep of the model output is in UTC, I have to add 5.30 with the model hours to get the IST (Indian standard time)....

7 giorni fa | 0

Risposto
Dynamic function call using eval
For this case, use the cast function. x = 42; for n = 3:6 bitlength = 2^n; fprintf("Casting %d to int%d.\n", x, bitl...

7 giorni fa | 0

Risposto
Interpolating NaN values in a matrix
interp1 isn't the right tool for this job. I recommend using fillmissing (with the dim input argument if you want to interpolate...

7 giorni fa | 1

Risposto
How to plot quiver vectors of same length and plot streamlines?
For part 1, you probably want to normalize your U and V data (if you assemble them into a matrix, the vecnorm function may be of...

8 giorni fa | 0

Risposto
Field ii ultrasound simulation: Unable to run C compiled binary files (mexw64 extension)
Which operating system are you using? As you can see from the table below: struct2table(mexext('all')) mexw64 is the extension...

9 giorni fa | 0

Risposto
Issue with integrating a function.
There are several problems with this code segment. Off the top of my head I see three serious problems. First, nowhere in the c...

9 giorni fa | 0

Risposto
i need license number i sign in with my account university
If you're trying to use a campus-wide license provided by your university, make sure you have a MathWorks Account using your uni...

9 giorni fa | 0

Risposto
How to verify a function with an input and output throws a warning?
The problem is indeed on this line and in your system_under_test function. Commenting it out so I can run other code later in th...

9 giorni fa | 1

Risposto
Having -1 as part of the result when factoring a polynomial
What happens if you omit that factor when you multiply the rest of the factors together? syms x y P1 = y^6 - x^6 f = factor(P...

9 giorni fa | 0

Risposto
Is it possible to ignore certain lines in MATLAB coverage test?
See the isMATLABReleaseOlderThan function. If you're using an older release, you could use verLessThan instead.

9 giorni fa | 0

Risposto
large errorbars on semilogx
What's the difference between the logarithm of 1 and the logarithm of 2? format longg x1 = log([1 2]) delta1 = diff(x1) Now ...

10 giorni fa | 1

Risposto
can I use matlab on new device?
It is possible to deactivate MATLAB on a machine (even if it is not available) and reactivate it on another computer.

10 giorni fa | 0

Risposto
Matlab Cloud Licensing / Azure AD, instead of internal Flexlm server
Please contact Technical Support directly using this link. They can work with you to determine what licensing options are availa...

10 giorni fa | 0

Risposto
Undefined function 'bisect' for input arguments of type 'function_handle'.
Another possibility is that the user saved it to a file not named bisect.m. If the name of a function file and the name of the m...

11 giorni fa | 0

Risposto
What does cppelt function do in findchangepts
which -all cppelt This is a private helper MEX-file in Signal Processing Toolbox. I don't believe we distribute the source code...

12 giorni fa | 0

Risposto
Download MATLAB 2023b for Windows off the network
Please try the instructions in this Answers post. If you encounter difficulties while doing so please contact your license admin...

13 giorni fa | 0

Risposto
Need help subtracting and doing if statements for time
There doesn't seem to be any date information included with your data, so I'd use duration instead of datetime. I'm mostly using...

13 giorni fa | 0

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Risposto
Problem with vpa integral
This type of error indicates you're assiging a symbolic expression into an element of a double array. When you do this, MATLAB w...

13 giorni fa | 0

Risposto
How to Rewrite This Section of Code as a For Loop
Conceptually, isn't taking the sum of an array of data just the same as repeatedly adding (+) each element to a running total? [...

14 giorni fa | 0

Risposto
Will Quality of Documentation be better in 2024 Products?
Release R2024a has not been released yet. As such we can't answer questions about it. But I am curious about your first sentenc...

15 giorni fa | 1

Risposto
After installation of MATLAB_R2023b in MacBook Air M1 2020. When I start MATLAB, I am getting the following error after few seconds. Though I am able to work in the background
Are you using a JRE other than the one included with Amazon Corretto 8? If so, try the workarounds listed in Bug Report 3104060....

15 giorni fa | 0

Risposto
simulink test tutorial file
Open the example using the command that gets copied to the clipboard when you press the Copy Command button. That model is part ...

16 giorni fa | 0

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Risposto
How do I make a weighted graph (with road intersections as nodes) from a map?
If you have a list of coordinates and a list of which nodes are connected by a road, use the graph or digraph (if you have one-w...

18 giorni fa | 0

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