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Steven Lord

MathWorks

Last seen: Today Active since 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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Answered
Fitting a Surface to a Function of Two Independent Variables
Let me ask you a simpler question. Here are two variables. What is the functional relationship between them? If y = f(x) what is...

ongeveer 14 uur ago | 0

| accepted

Answered
i buuy yesterday mathlab
Please contact Technical Support directly using this link for help with this installation or startup issue.

1 dag ago | 0

Answered
A group of 12 people all roll a pair of dice 12 times, how often does each person roll a total number that is greater than or equal to 7?
Your first four lines of code are correct. - How many times does each person roll a total number greater than or equal to 7? R...

1 dag ago | 1

Answered
Is this a logical Error in Matlab ? exp (pi*i*6) = 1.000000000000000 - 0.000000000000001i. WHY an i component ?, should just be 1
is a transcendental number. pi is the double precision approximation to that number. There are some functions in MATLAB that let...

2 dagen ago | 4

Answered
Using ODE45 to Solve a System of Equations Outputting Linear non-Ideal Results
The form I have rearranged the equations in to is: M(Y) + dY/dz = F(Y) Where M(Y) is the mass matrix, dY/dz are the collec...

4 dagen ago | 0

Answered
How do I get MATLAB to recognize a BCE
Rather than trying to create a string containing a negative year to represent a BCE date and passing that string into datetime, ...

5 dagen ago | 0

Answered
Error in multipying a 3 by 3 matrix with a 3 by 1
Xa = app.previewTABLE.Data(:,1); Ya = app.previewTABLE.Data(:,2); Za = app.previewTABLE.Data(:,3); C = [Xa;Ya;Za]; %% 3x1 m...

5 dagen ago | 0

Answered
Trying to MATLAB code to find augmented matrix D, please help
Let's compare the C matrix that you defined in your code: C1 = [3; 2; -1; 5] and the one defined by what I assume is the text ...

5 dagen ago | 0

Answered
MATLAB sometimes thinks the keyword "ans" refers to a a file
If there's no variable named ans in the workspace, MATLAB would try to call the ans.m script file that contains the help text re...

6 dagen ago | 0

| accepted

Answered
Please share the algorithm of the particular data set. I want to find out average of the attached data of every 5 seconds. Thank You
Since you have time-based data you might want to read your data into a timetable using the readtimetable function. If you do, th...

6 dagen ago | 0

Answered
Compare Elements in 2 Arrays
Use the min function.

7 dagen ago | 0

Answered
How do I stop Matlab from creating temporary files (2020b and newer) or delete them programmatically?
From your description and your mention of Simulink.sdi.clear resolving the problem, this sounds like it might be Bug Report 2507...

7 dagen ago | 0

Answered
How to build a graph of the solution of a second-order differential equation in MATLAB
Solve the system of ODEs numerically (try using ode45 first, and switch to a stiff solver if it takes too long) rather than symb...

7 dagen ago | 0

Answered
zero padding
If you're using release R2023b or later, see the paddata function introduced in MATLAB in release R2023b.

8 dagen ago | 1

Answered
Bug in saving .fig (but not .png or .pdf) from when specifiying YAxis.Exponent as -6
This sounds like Bug Report 3147076 which is listed as fixed in release R2023b Update 6.

8 dagen ago | 0

| accepted

Answered
How do I use Matlab to create a boxplot?
What do you mean by "code a boxplot"? Are you trying to call the boxplot function from Statistics and Machine Learning Toolbox a...

9 dagen ago | 0

Answered
Matlab R2022b won't save .fig
Let's make sure you haven't created your own savefig.m that is taking precedence over the savefig function that is part of MATLA...

9 dagen ago | 0

| accepted

Answered
Solve my determinant equal to zero with roots
You can use the vpasolve function to solve the polynomial, use the sym2poly function to automate extracting the vector of coeffi...

9 dagen ago | 1

| accepted

Answered
ddesd solver for discrete points
This sounds like a homework assignment. If it is, show us the code you've written to try to solve the problem and ask a specific...

11 dagen ago | 0

| accepted

Answered
How do I call a function from the command window
What you have right now is a script file with a function defined inside it. Functions inside script files are not directly acces...

13 dagen ago | 1

Answered
How do I create custom signatures for non-static class methods?
The foo method of your SomeClass class is an ordinary method (as opposed to a static method) so at least one of the inputs must ...

13 dagen ago | 0

| accepted

Answered
how to add cusom properties on current project object
Please contact Technical Support directly using this link and ask them to enter a request to add properties to the Project objec...

13 dagen ago | 0

Answered
Jumps in roots finding solutions
The documentation of the roots function doesn't state anything about a particular order in which the roots are returned. What ha...

14 dagen ago | 1

Answered
Function Call without parentheses
Calling a function without parentheses and with 0 input arguments Yes, you can call a function without parentheses. In fact, yo...

14 dagen ago | 0

Answered
Variable q10 must be of data type double. It is currently of type sym. Check where the variable is assigned a value.
As you can see from the fact that your code ran in MATLAB Answers, your code does work. I'm assuming that you're running this in...

15 dagen ago | 0

Answered
Freshly (re)installed MatLab R2023b error message upon startup
Rename this script file. C:\Users\sbnda\OneDrive\Documents\MATLAB\class.m Its existence by that name prevents MATLAB from call...

17 dagen ago | 2

Answered
How to reduce \t commands
Rather than trying to format your data in a tabular fashion yourself, have you considered putting your data in a table array and...

19 dagen ago | 0

Answered
Finding range of variable for which eigenvalue of matrix is negative.
syms T Matrix = [ 0 1 -1; 1 0 0; -1 0 (-2/T) ] You can compute the eigenvalues symbolically, but the...

20 dagen ago | 1

Answered
How to get graphics array content App Designed
Rather than searching for the panels after the fact, I'd probably create a property of your app that can contain a vector of han...

20 dagen ago | 0

Answered
scrit can't error related to Sortrows and matrix
% sort the matrix of feasible solutions based on the objective (here vol, the third column) sol_sorted = sortrows(sol,8); Does...

21 dagen ago | 0

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