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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
Question about different results using PCA and SVD
From the Algorithms section on the pca documentation page: "The pca function imposes a sign convention, forcing the element with...

10 hours ago | 1

| accepted

Answered
Is there a more efficient way to format my vector rather than manually change the code by hand
%Time T = 5400; INT = 900; tme = 0:INT:T; %Number of Positions and Impacts Pn = 1320; In = [30, 60, 75,...

11 hours ago | 0

| accepted

Answered
How can I make these few lines a function?
If you want all the axes you create going forward to have those property values, consider changing the default property values r...

13 hours ago | 0

Answered
how to make something between quotation automatic!
If you're just fitting polynomials you could use polyfit and polyval, specifying n as the third input argument. load census n ...

1 day ago | 0

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Answered
How and where can I get the clearance permission for using maps generated in MATLAB?
For legal questions like this please create a service request for Customer Service.

3 days ago | 0

Answered
Why is ascii2str not recognized in 2022a?
According to the documentation "The operator ascii2str is supported only in Stateflow® charts that use C as the action language....

3 days ago | 1

Answered
Natural Cubic Spline Interpolation
Set a breakpoint on the first line of your code. Run your program on an example that you (or your textbook) have worked out, ste...

4 days ago | 0

Answered
Find country code from city name
As far as I'm aware there's no function in MATLAB to map address information to country information, but if there is a web resou...

6 days ago | 0

Answered
pause() function is inaccurate
You probably want to create an audioplayer object and call playblocking on it instead of using sound. load handel sound(y, Fs)...

6 days ago | 2

| accepted

Answered
Couldn't find the file
That data file is in the example's folder, which is not on the MATLAB path by default. If you open the example in MATLAB using t...

7 days ago | 0

Answered
problems with creating a multiplication table
If you change your code so as to no longer use table as a variable name (since table already has a meaning in MATLAB) you could ...

7 days ago | 1

Answered
value of type 'sym' is not convertible to 'double'
You cannot create a sparse matrix that contains a symbolic expression. Either store the symbolic expression in a symbolic matrix...

7 days ago | 0

Answered
"Precise" random variables from a distribution
Since 0.01 cannot be exactly represented in double precision, your values may not be exactly multiples of one-hundredth. But if ...

8 days ago | 0

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Answered
using inputdlg function in user defined function
Since you're doing this in a MATLAB Function block, rather than bringing up a dialog each time I'd consider using a Constant blo...

9 days ago | 0

Answered
matlab.unittest.TestCase automatic retry
This isn't directly an answer to your question, but as an alternative to always needing to rerun some or all of your tests can y...

9 days ago | 0

Answered
Round towards specific values in an array
A = [2000 1999 1998 1996 1993].'; B = [2000 1995 1990 1985 1980].'; Assuming all the elements of B are unique, interpolate to ...

9 days ago | 0

Answered
LaTeX interpreter is not working correctly with code including subscripts in Control System Toolbox legends
This is Not a Bug. In LaTeX, A_bc will only treat b as a subscript. In order to include multiple symbols in a subscript (or supe...

9 days ago | 0

Answered
add columns to matrix
In general you can use blkdiag. A=[1 2 3 6 ]; B=[4 5 5 6 9 8 7 6 9 6 8 6 9]; D=[4 1 2 3 5 68 9 6 9 6 9 6 9 6 9 63 45 82 85 96...

10 days ago | 0

| accepted

Answered
How can I edit code so only bottom graph is displayed.
The histcounts function does not return an object with properties like the histogram function does, but the outputs from histcou...

10 days ago | 0

Answered
Plotting a multi-dimensional matrix
In MATLAB select the Plots tab on the Toolstrip. Click the small downward pointing triangle to the right side of the Plots secti...

10 days ago | 0

Answered
Detect and remove outliers in signals
You could try filling the outliers with NaN values (or some other method) using the filloutliers function. x = [1 2 99 4 5] fi...

11 days ago | 0

Answered
Matlab 2020a doesn't find complier when it did with 2017a
According to the Supported Compilers column entry for release R2020a on the Previous Releases system requirements page Windows S...

12 days ago | 0

Answered
When will Ubuntu 22.04 be supported?
Ubuntu 22.04 LTS is not listed on the Platform Road Map. Therefore as far as I'm aware we have not announced when or if this OS ...

12 days ago | 0

Answered
find(V==max(V),1,'first') returns index that is way beyond the first index where X reaches the maximum
What are the sizes of the variables involved in creating your plot above, and what is the exact syntax for the plot function tha...

12 days ago | 0

Answered
How to plot and save the content of a 5D array?
Is your main question how to assemble the file name? I'd use a string array. n = 1; p = 42; q = 999; filename = "part" + n +...

12 days ago | 0

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Answered
Missing Simscape examples in R2022a
If you're trying to open this example, that example is part of the Simscape Electrical product. The output of ver that you've sh...

13 days ago | 0

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Answered
Datetime errors when I import data
When you selected options in the Import Tool, you told it that you wanted it to import your Scadenza data as a datetime array. B...

13 days ago | 0

Answered
Saving Each Table Within a Structure as its Own Entity
So if I understand what you want to do correctly, you have a vector of identifiers and an array or a table of data: rng default...

13 days ago | 0

Answered
How do I activate a license on an off-site machine?
Is the off-site laptop able to access the internet? If not the documentation includes instructions on how to activate an install...

13 days ago | 0

Answered
Using logical index matrix to create another matrix with values
What do you want the elements that did not satisfy the condition in your original matrix to be in the new matrix? You can't have...

13 days ago | 0

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