Steven Lord
MathWorks
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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I can't run a file
Most often I'd expect to see this if you tried to include either a space in the name of your MATLAB program file (not allowed) o...
18 hours ago | 1
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Telling numbers and letters apart
You can use the isstrprop function to determine which characters inside a string are letters. S = ["D56788T5434" "E44G5555" "...
21 hours ago | 0
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For "Characterize Battery Cell for Electric Vehicles" the "copy command" does not lead to the same content as the website example
The version of the example on the website is from the most recent release, which as I type this is release R2024a. You indicated...
2 days ago | 1
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Information needed to identify your computer is missing or invalid.
Please contact Customer Service directly using this link for help with setting up a license to run on both the classified and un...
3 days ago | 0
matlab program drawing style
Note the scale of the Y axis in your plot. Around t = 0 and t = 0.033 the value of D must get very small in magnitude, leading t...
3 days ago | 0
When running an exe created from a matlab app, where are the variables stored?
The variables are stored in the memory of the executable. Just like you don't need to allocate space for your web browser to sto...
3 days ago | 0
Perform Calculations on Data in A Table and Create a New Table
I'd likely turn your Time column into a duration array (using the seconds function) then convert your table into a timetable usi...
3 days ago | 0
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Parallel computing of "for" loop
Is it the case that the computation of the value for the entity in the second iteration of your loop requires the value of the e...
3 days ago | 0
Not getting the expected size matrix from evaluating a function handle that is equal to zero
I am expecting Z to be zeros matrix of 10x10. But I am getting Z to be a 0 of 1x1. Why? Because that's what you told your fun...
3 days ago | 0
Creating three shaded regions in a loglog plot
If you're using release R2023a or later and you want to create horizontal or vertical regions, consider using the xregion and/or...
4 days ago | 0
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...
5 days ago | 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...
6 days ago | 0
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...
6 days ago | 0
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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...
10 days ago | 2
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...
10 days ago | 0
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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...
10 days ago | 0
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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)....
11 days ago | 0
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...
11 days ago | 0
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...
11 days ago | 1
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...
12 days ago | 0
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...
13 days ago | 0
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...
13 days ago | 0
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...
13 days ago | 0
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...
13 days ago | 1
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...
13 days ago | 0
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.
13 days ago | 0
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 ...
14 days ago | 1
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.
14 days ago | 0
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...
14 days ago | 0
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...
15 days ago | 0