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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
small floating point has been considred as zero value!
More likely than not, your value for x is not what you think it is. If we run your code on Answers: x=0.16 if x>0.1 d=1 ...

12 hours ago | 1

Answered
I am keep on getting this error in my matlab code when i try to execute this code.
Why have you written your own fprintf.m file? That means you won't be able to call the fprintf function that is part of MATLAB a...

3 days ago | 0

Answered
code no longer working but was fully functional and changed nothing
Somewhere before this line of code: Sjforce_filtered=filtfilt(b,a,SjForce); at least one element of SjForce became non-finite ...

3 days ago | 1

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Answered
Adding numeric values to imagesc
This function didn't exist when the question was originally asked, but I suspect the original poster had something like heatmap ...

4 days ago | 0

Answered
how to build a n*n weighted matrix
Do you want to create the weighted adjacency matrix or do you want a digraph object that you can manipulate and analyze (asking ...

4 days ago | 0

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Answered
why the arrangement of elements are changing?
I think what you're asking is how you can force ga to always return b as an increasing vector ('ascend' using the wording from t...

4 days ago | 0

Answered
Function headers/funtions for numerical approximations
From the integral2 documentation page: "The function fun must accept two arrays of the same size and return an array of correspo...

4 days ago | 0

Answered
Inconsistency when assigning to the 'Month' property of a datetime array in a timetable
From the old rhyme, "Save February at twenty-eight, // But leap year, coming once in four, // February then has one day more." ...

5 days ago | 0

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Answered
fprintf function writes irrelevant data into my file
We cannot run your code because we don't have the meas matrix. Please post the code that creates it or attach a MAT-file with at...

5 days ago | 1

Answered
I don't know how to put the answers in a row, and why the array is not being represented when I run the code.
Should some of your relational operators be less than or equal to (or greater than or equal to) instead of strictly less than or...

5 days ago | 0

Answered
"Undefined variable" error even though variable is defined
I'm guessing that you want to initialize Background1 when t is equal to 1 and to use the formula to update Background1 when t is...

8 days ago | 0

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...

10 days ago | 0

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

11 days 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...

11 days 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...

12 days 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...

14 days 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, ...

15 days 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...

15 days 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 ...

15 days 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...

15 days ago | 0

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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...

16 days ago | 0

Answered
Compare Elements in 2 Arrays
Use the min function.

16 days 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...

17 days 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...

17 days ago | 0

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

18 days 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.

18 days 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...

19 days 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...

19 days 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...

19 days ago | 1

| accepted

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