Steven Lord

MathWorks

Last seen: Today | Con actividad desde 2002

Followers: 3 Following: 0

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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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 ...

alrededor de 12 horas hace | 0

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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...

1 día hace | 0

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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.

2 días hace | 1

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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...

2 días hace | 0

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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...

3 días hace | 0

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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...

4 días hace | 0

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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 ...

4 días hace | 0

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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...

4 días hace | 0

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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...

4 días hace | 0

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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 ...

4 días hace | 1

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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 ...

5 días hace | 1

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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; ...

6 días hace | 0

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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...

8 días hace | 0

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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 ...

8 días hace | 0

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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...

8 días hace | 0

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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...

9 días hace | 0

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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...

10 días hace | 0

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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...

10 días hace | 0

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

10 días hace | 0

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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...

11 días hace | 1

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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*...

12 días hace | 1

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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...

13 días hace | 4

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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...

14 días hace | 0

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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...

14 días hace | 0

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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...

14 días hace | 0

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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...

15 días hace | 0

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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...

15 días hace | 0

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Having trouble printing variables I use as inputs to a function.
Let's look at a few selected lines of your code. The only variable that gets displayed with NaN values is uvwAndrSol so let's fo...

15 días hace | 0

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No matter the NOA matrix I enter, the result I receive is "empty double column vector" and I want to receive a numerical value.
Let's look at the last column of your two matrices. syms phi_a phi_o phi_n %Rotation in a T_a = [cosd(phi_a), -sind(phi_a), 0...

17 días hace | 0

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How to convert a function handle to symbolic function?
Are you hoping to use this fit object as the right-hand side of a differential equation ? If so keep in mind that fit objects ha...

17 días hace | 1

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