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Steven Lord

MathWorks

Last seen: Today |  Attivo dal 2002

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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 to fit my data to interpolated functions
Rather than defining your function as a large piece of text, I would define it as a function as per the "Fit a Curve Defined by ...

circa 9 ore fa | 0

Risposto
Averaging non-aligned time-series arrays
If those integer arrays represent some amount of time (seconds since the start of whatever experiment you used to collect the da...

circa 9 ore fa | 0

Risposto
How can I insert a variable into a plot legend, with a special character following the variable?
In addition to what the others have said, rather than passing empty strings into the legend function to skip one or more of the ...

1 giorno fa | 0

Risposto
after inter activation key write for me Invalid Activation Key (510). For help resolving this issue, see this MATLAB Answer.
If following the instructions in that MATLAB Answers post linked in the error message did not solve the problem, please contact ...

5 giorni fa | 0

Risposto
Cannot define a cell array of custom classes in function argument validation
What's the default value for your property? properties (Access = private) configurations (1, :) cell {mustBeA(configurat...

5 giorni fa | 0

Risposto
I think, I might have a problem with the 'hold' part and I get the 'error while evaluating button privatebuttonpushedfcn'
Don't call figure if you don't want to create a new figure.

6 giorni fa | 1

Risposto
Can I use a struct in an anonymous function?
When I run the ode15s I obtain an error which pertains to the inclusion of the struct as an input to the function. Please show...

6 giorni fa | 0

Risposto
How to fill a variable with the results of an if...elseif statement
Rather than creating variables whose number of rows is not known ahead of time, I'd consider creating a table of coordinates and...

7 giorni fa | 0

Risposto
I am getting errors that I am using ".*" and "*" wrongly in my matrix multiplications in my code. I am poor at matrix algebra and don't know when to use each operator.
Read through this documentation page and ask yourself the question: do I want to multiple each element of one array by the corre...

8 giorni fa | 0

Risposto
Plotting a graph based on a large table
When you say "haven't got a clue how to do it" does that mean that you know what type of plot you want to create but don't know ...

8 giorni fa | 0

Risposto
Subtracting matrices by column and performing a summation.
Some functions you'll find useful are the diff, abs, and sum functions. The latter two are pretty easy to find in the doc by sea...

8 giorni fa | 0

Risposto
Choose any workspace from dbstack for evalin
It comes to me whether I can specify any workspace found in the dbstack here. No. For the evalin function in MATLAB you can spe...

9 giorni fa | 0

Risposto
splitting a vector into separate vectors
Can you dynamically create variables with numbered names like V1, V2, V3, etc.? Yes. Should you do this? The general consensus ...

9 giorni fa | 1

Risposto
Deployed Matlab function with strage errors: functions not found
I am fairly certain that the limitation described in the "Do Not Rely on Changing Directory or Path to Control the Execution of ...

9 giorni fa | 1

Risposto
Using a variable in an input prompt
Another possibility you can use in recent releases of MATLAB (since I think release R2016a) is to use a string array. ii = 5; ...

10 giorni fa | 0

Risposto
Compare char data in a cell {'x'} to a character 'x'
You've got a lot in here. I'm going to step through certain parts. Let's start off with this comment (formatting added, your wo...

12 giorni fa | 0

Risposto
How do i multiply this matrix to work in MATLAB, it keeps sending an error
What did you expect to happen when you typed p. in your expression? That's not valid MATLAB syntax. If you had a number instead ...

12 giorni fa | 0

Risposto
Changing the value of only one parameter causes a problem (possibly with while loop)
Let's look at the while loop. while (V(i) >= Vmax) D(i)=floor(20*(sqrt(4*Q(i)/(pi*Vmin))))/20; V(i)=Q(i)/(pi...

12 giorni fa | 0

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Risposto
Examples missing from requirements toolbox installation
I'm not 100% certain, but it looks like this page from the release R2022b documentation (the third entry under Topics in the Req...

13 giorni fa | 0

Risposto
Duration of time values for separate datasets and plotting on x-axis
set0_time=["085440","091530","092000","093020","100000","100020","101325"]; set0 = set0_time; set0_ydata=[30 50 60 72 82 85 88...

14 giorni fa | 0

| accettato

Risposto
How can I bring back the command prompt in the command window after it disappeared ??? I cant execute commands !! if I press enter the commands disappear,
In the lower-left corner the status message says "Waiting for input". Does your code call the input function (perhaps with an em...

14 giorni fa | 0

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Risposto
How to reopen tabs for different projects
Sounds like you may want to create a MATLAB Project for each of your projects.

14 giorni fa | 0

Risposto
Undefined function or variable 'aviread'. >> aviread('traffic.avi'); Undefined function or variable 'aviread'.
There used to be an aviread function in MATLAB, but I believe it was removed sometime around release R2014b. The recommended rep...

15 giorni fa | 1

Risposto
how i can show in matlab tha sqrt(x^2)=x in symbolic toolbox
That's not true in the general case. A = 1; h0 = 1; dhmax = 2; B = -5; lhs = ((2*A*dhmax + B*h0)^2/h0^2)^(1/2) rhs = (2*A*...

16 giorni fa | 1

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Risposto
An absolutely ascending sequence
Those who have said there is no function for this are incorrect. The issorted function allows you to ask if an array is sorted a...

17 giorni fa | 4

Risposto
Strange case of Code analyzer and if-else block
It’s rather obvious that only one of the blocks will execute, and it seems redundant for the analyzer to flag this. In this cir...

18 giorni fa | 0

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Risposto
The rotation in the rectangle function in matlab cannot be used, but the 2022 version can be used.
try rectangle('Position',[1 2 5 6],'Rotation',45); catch ME fprintf("This command threw the following error:\n%s", ME...

18 giorni fa | 0

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Risposto
How can I fix ODE45 returning a straight line when using specific `tspan` points, instead of showing dynamic behavior over the time range?
Your ode_LR function is defined to accept four input arguments, the two required arguments plus two additional parameters. func...

18 giorni fa | 0

Risposto
error running getting started code
If you're using this matrix: a = [1 3 5 2 4 6 7 8 9]; the warning is correct. The matrix y...

19 giorni fa | 0

Risposto
Using "unique" to identify unique values AND number of occurrences of each unique value
Use the groupcounts function. A = {'AGAP001076-RD' 282 0.67229 'AGAP001076-RD' 285 0.75292 'AGAP001076-RD' 286 0.66957 'AGAP...

19 giorni fa | 0

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