Steven Lord

MathWorks

Last seen: Today | 自 2002 起处于活动状态

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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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How can I com[act my script by making it run up to an nth variable
Can you dynamically create variables with numbered names like z1, z2, z3, etc.? Yes. Should you do this? The general consensus ...

6 hours 前 | 0

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Eliminate the long number appearing in symbolic calculations
Note that you don't want to write your numbers in double first before performing calculations involving the symbolic variable J1...

3 days 前 | 1

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Where I can find the MATLAB library *.m files?
What specifically do you mean by "MATLAB library *.m files"? If you mean the *.m files for built-in functions like matrix multi...

4 days 前 | 0

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How store evolution of x over the iterations of lsqnonlin?
The ouput of the system is defined by a function file 'error.m', Please rename this function! error already has a very importan...

4 days 前 | 0

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Method of Characteristics for Nozzle: Error with syms function
Looking at a few sections in your code, first you define x to be a symbolic variable and you use it as such. syms x f = @(x) (...

4 days 前 | 0

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How do I pass a dynamic number of output variables to a function?
I need to pass a number of output variables that depends on other variable (whose value is not previously known). I wouldn't us...

4 days 前 | 0

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I don't understand an error message I get that's related to function ode45.
More likely than not, your ODE function is returning a vector of a different size for one set of inputs than it does for other i...

5 days 前 | 0

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Error using feval Function to evaluate must be represented as a string scalar, character vector, or function_handle object.
Run this command in your MATLAB Command Window. At the prompt, type the five characters bench and press Enter. fname = input('\...

5 days 前 | 0

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the mechanism of different syntax for realizing the same effect
I'm not sure your mental model is quite correct, so I want to walk through your question in a bit of detail. Multiple syntaxes ...

5 days 前 | 2

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test Statistic Toolbox without Flexlm server
You could check using the license function before you try to use functions from Statistics and Machine Learning Toolbox whether ...

5 days 前 | 0

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problem with storing in an array
To take a smaller example: A = magic(4) What does indexing into A using one index do? A(3) If you count down the columns, 9 ...

7 days 前 | 0

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Unable to called a function
If you're using release R2021b or later, consider using the ode78 function that is part of MATLAB as of that release. If that i...

7 days 前 | 0

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opening .m file results in "index exceeds the number of array elements"
How are you trying to open the file? Are you calling open or edit with the name of the file as inputs? If so, make sure you don'...

7 days 前 | 0

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App running slowly after some time
As J stated, without seeing the code it's going to be difficult or perhaps impossible to offer any concrete suggestion. But from...

7 days 前 | 0

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For Loop Increment Array
I wrote the code according to my lesson but it keeps inserting a 0 between each number in the array. It doesn't so much insert ...

7 days 前 | 0

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What About My Matrix Makes eig Inaccurate?
N = 30; f_matrix = zeros(N, N); even_sum_matrix = zeros(N, N); odd_sum_matrix = zeros(N, N); for t = 1:N for s = 1...

9 days 前 | 1

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Need help to solve with ncmlogo.m
Let's look at the text of the error message. Incorrect use of matlab.graphics.chart.primitive.Contour/setZDataImpl Z must be a...

10 days 前 | 1

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Unhelpful error message: Conversion to matlab.ui.control.Table from table is not possible.
Please send this enhancement request to Technical Support directly using this link.

11 days 前 | 0

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Argument validation for class methods
The class specification of the obj argument seems superflous and should be self-evidently true. Not necessarily. The first inpu...

11 days 前 | 0

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How can I apply data in function?
I'm not sure I understand your question. Are you asking about how to pass input arguments into a function? If so see this docum...

11 days 前 | 0

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Solving unknown matrics to the power 20
p = [1 0 0 0 0 0 0]; R = [9; 8; 7; 6; 5; 4; 3]; CR = [0.45]; RHS1 = CR./(p*R) Did you perhaps mean to take the outer product...

12 days 前 | 0

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How to use the class of Interleaved ADC.m?
Do either of these two examples (example 1, example 2) provide the information you seek about the functioning of the Interleaved...

12 days 前 | 0

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I am trying to figure out how to use writetable instead of xlswrite, but the feature is converting my numbers to text. Headers are text.
Don't concatenate Excel_head and Excel_out together. Store them as separate table variables. load patients; LNS = string(LastN...

13 days 前 | 0

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How to measure time of matrix multiplication in matab?
As stated on this documentation page, "Sometimes programs run too fast for tic and toc to provide useful data. If your code is f...

13 days 前 | 0

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Fill colour in a scatter plot
This wasn't an option when the question was originally asked, but if you're using release R2023a or later you could use xregion ...

13 days 前 | 1

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Difference between %d and %f?
If you want to print integer values, you probably want to use %d. If you want to print non-integer values, you probably want to...

15 days 前 | 1

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viscircles function generates an error message
I'm guessing you've created your own line.m that's taking precedence over the line function that is part of MATLAB. To check thi...

19 days 前 | 0

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Is there a way to check code generation compatibility for a mlapp file?
By "code generation" do you mean generating C or C++ code using MATLAB Coder? I'm fairly certain that's not going to work, as it...

20 days 前 | 0

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simulink online not working
What does "the drag options cannot be used" mean in this context? Do you receive warning and/or error messages? If so the full ...

20 days 前 | 0

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I have a MATLAB 2022 code that used the poly.intersect function--I can't find in R2024 and need a workaround
Please don't start a new question that duplicates one that already existed. Add comments to the one that already existed. I don...

20 days 前 | 0

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