Steven Lord

Last seen: Today

MathWorks

4.456 total contributions 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
rng seed and cvpartition
You're calling rng shuffle on the client, not on the workers. See this documentation page.

ongeveer 2 uur ago | 0

Answered
Why do I get incorrect argument when calling "indeces"?
You're missing the equals sign (=) that would assign the result of the computation PSD>35000 to the variable indices, so MATLAB ...

1 dag ago | 1

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Answered
how to automatically identify errors in the output of checkcode
Generally speaking, a Code Analyzer red message (error) will prevent the code from executing. So if you have tests for the larg...

1 dag ago | 0

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Bug report for R2020a
I suspect that sample.m file is part of this submission on the File Exchange. A note in the description of that submission state...

1 dag ago | 2

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Retrieve actual values from histogram
Do you want the raw data that was used to create the histogram or the probabilities of the bars? In the former case look at the ...

2 dagen ago | 0

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Adding number of seconds from changing base date
You can construct a datetime directly from the number of seconds. From the documentation page for datetime: "t = datetime(X,'Co...

2 dagen ago | 0

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Can 2 students come up with the same codes for a homework assignment
Sometimes the constraints placed on the students as part of the assignment encourage or almost force the result of the assignmen...

2 dagen ago | 0

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Undefined function 'ne' for input arguments of type 'table'.
If you want the data as a smaller table, index into the larger table with parentheses. Folderlinks=columnData(:,8) % Folderlink...

2 dagen ago | 0

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Why the function that I created won't be called?
From the error message you showed, on line 4 of eegamplitude you're calling relaxed with 0 input arguments and 1 output argument...

2 dagen ago | 0

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Divide timetable into 1s windows
Rather than creating a whole bunch of small timetable arrays, could you instead use a timerange to select the appropriate subset...

2 dagen ago | 0

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makeDOMCompilable() is not recognized
MATLAB Report Generator not being installed would certainly result in makeDOMCompilable not being available. After you installed...

2 dagen ago | 0

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Answered
How can I join two parts of a char into just one?
I would use a string array in this case, not a char array. numfiles = 9; % Lenght parameters step = 0.5; start = 6; final =...

2 dagen ago | 0

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Why is R2020a slow to return errors?
Do you have any network directories on your MATLAB path? If MATLAB has to search those network directories to determine if there...

3 dagen ago | 0

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Answered
duration of free trial
The trial request page (linked at the end of this page, in the "Try or Buy" section) states "Get Started Now with your Free 30-D...

3 dagen ago | 0

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what is the inside program / function of rmoutlier? how rmoutlier inbuilt function will work? why cant we write a program without using rmoutlier function?
We don't distribute the source code for the undocumented helper function that rmoutliers uses. [Note the extra s in the name; th...

3 dagen ago | 0

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Answered
The imshow() function is not working with .mat file
When you call load with an output argument, any variables stored in that MAT-file becomes fields in the struct array returned fr...

3 dagen ago | 0

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crc16 checksum in matlab
See <https://www.mathworks.com/help/matlab/matlab_prog/perform-cyclic-redundancy-check.html this documentation example>.

6 dagen ago | 0

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i have downloaded ANN toolbox and i cant open the file emran8.mexw32 please help me
A file with the mexw32 extension is intended to be used in a 32-bit version of MATLAB on a 32-bit version of Windows. The last 3...

6 dagen ago | 0

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histogram returns an error for vector data
You can't create a histogram from double data in an axes in which you've already plotted datetime X data. v = 0:5; t = datetim...

7 dagen ago | 0

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Difference between deployed mode or MATLAB mode?
From the documentation page "If you include this function in an application and compile the application, the function will retur...

8 dagen ago | 1

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Answered
How to avoid converting a great number of datenum values into datetime for tick labels?
I would like to have date values on the x-axis, but converting datenum values to datetime takes a lot of time. How are you perf...

8 dagen ago | 0

Answered
How to change properties of several plots simultaneously?
x = 0:360; y1 = sind(x); y2 = cosd(x); figure h1 = plot(x, y1); figure h2 = plot(x, y2); set([h1, h2], 'Marker', '^',...

9 dagen ago | 1

Answered
I want to produce square wave without using square function, but this code it showing error, "illegal use of IF keyword". How to rectify it?
In some languages (like C) you need to use {} around sections of code (like the bodies of for loops or if statements.) MATLAB is...

9 dagen ago | 0

Answered
scatter plot with color dependent on variable.
Use the c (usually the fourth) input when you call scatter. See the "Vary Circle Color" example on the documentation page. You w...

9 dagen ago | 0

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How to fill a cell with function handles using iteration numbers?
c = (1:10).^2; G = cell(size(c)); for whichElement = 1:numel(c) G{whichElement} = @(x) c(whichElement)*x; end Yes, when...

9 dagen ago | 0

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Answered
For loop optimization in matrix operations
You don't need to loop to generate the values that you multiply by +1i or -1i and pass into exp. % Sample data x = randn(4, 5,...

9 dagen ago | 0

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Why is it that the breakpoint does not work?
The body of a parfor generally doesn't run in the MATLAB session in which you're running the parfor. As stated in the "Test parf...

9 dagen ago | 0

Answered
MATRIX INVERSION TAKING FOREVER TO RUN
In general, you should not invert matrices. I suspect you're trying to work symbolically in which case you absolutely should not...

9 dagen ago | 0

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Index into 32 bit word to extract relevant data
Use the bit-wise operations functions or use rem, mod, subtraction, and division.

9 dagen ago | 0

Answered
Saving all Superclass properties inside one subclass property
Should FeatureDatabase inherit from Feature (be a Feature?) Or should FeatureDatabase have a property that contains an array of...

9 dagen ago | 0

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