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Steven Lord


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MathWorks

3,740 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
Why I got the error "Undefined operator '.*' for input arguments of type 'function_handle"?
You can't multiply a function handle, which is what s returns. If you intend s to evaluate the function handle RCac, just make i...

10 hours ago | 0

Answered
eliminating NaN values from an array
In newer releases you can use rmmissing to remove missing data (NaN for double and single precision data, <undefined> for catego...

10 hours ago | 0

Answered
Proper Treatment of Symbolically Linked Script in Editor
Why not just add the directory containing the original preprocessing script file to the MATLAB search path? That will make it ca...

2 days ago | 0

Answered
Getting the linear portion of a non-linear curve
The ischange function may be of use to you. Depending on what you're planning to do with this data the detrend function may also...

2 days ago | 2

Answered
Save Open State in Editor???
In the Preferences for MATLAB, there's a section titled Editor/Debugger. One of the options that you can select (and I believe i...

2 days ago | 0

Answered
HEEELP : Index in position 2 is invalid. Array indices must be positive integers or logical values. !!!! why???
center=(length(y))/2; for i=1:length(lambda) opticaxis(i,:)=E_z(:,center,i)'/(max(E_z(:,center,i))); end If ...

2 days ago | 1

Answered
How can I initialize nested handle class with independent values
The section titled "Initializing Properties to Handle Objects" on this documentation page states what happens when you initializ...

3 days ago | 1

Answered
How do I Ctrl-R on Mac?
FYI to search for or customize the keyboard shortcuts, see the Keyboard preferences as described on this documentation page. Sea...

3 days ago | 0

Answered
Matlab licensing administration questions
I recommend that you contact Technical Support directly with these questions, as they should be able to offer guidance specific ...

3 days ago | 0

Answered
Why does categories(TableA.Var2) have more elements than the rows in TableA?
Your CarLineFaultCodes table only contains a subset of the rows of FaultCodesTable, and your ModuleFC table only contains a subs...

3 days ago | 1

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Answered
Multiplication of two fields in a structure array
You made a typo on this line. Struct(i).dy_dc=(Struct(i).L1).*(sin(Struct.(i).phi1)); There shouldn't be a period between Stru...

4 days ago | 1

| accepted

Answered
definite integral not giving exact answer
Compute your limits of integration symbolically to avoid roundoff error. f = sym(4)/5; a = acos(f); inner_int = int(r*sin(phi...

4 days ago | 1

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Answered
Convert Columns Arrays to numeric
Using the example from the timetable help text: MeasurementTime = datetime({'2015-12-18 08:03:05';'2015-12-18 10:03:17';'2015-1...

4 days ago | 0

Answered
Parsing text files for Beginners
There are several ways to read this data in. While you can do this using a series of commands, an easier approach (especially if...

4 days ago | 0

Answered
Initializing multidimensional array and dynamic expansion
Build your size vector first. Ideally you have an upper bound on the number of dimensions: upperBoundOnNdims = 10; sizeVec = o...

5 days ago | 1

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Answered
Grid overlay on "plots()"
You want to turn grid on? Use the grid function.

5 days ago | 0

Answered
How to assign a class method as a ClickedCallback?
methods function h = get_save_handle( obj ) h = @obj.save; end end The name of the me...

5 days ago | 0

| accepted

Answered
Disp: "Dot indexing is not supported for variables of this type"
You've written or downloaded a disp.m file that's shadowing the built-in disp function. Run this code. which -all disp You wil...

5 days ago | 0

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Answered
Problem with if statement
If you want to check if element i of y is less than 2, that's not what your if statement says. It is checking all the elements o...

5 days ago | 0

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Answered
How to get the address of libpointer?
Why do you need or want to get the address? If you're looking to iterate through the array, just use the + operator as shown by...

5 days ago | 0

Answered
Delete rows from a timetable with an specific criteria
See the "Select Rows with Logical Indexing" section on this documentation page for an example you can use as a model. That examp...

5 days ago | 1

| accepted

Answered
How to assign a symbolic variable to a location inside a matrix?
In your expression y(1, 1) = A the expression on the left of the equals sign refers to a double array while the expression on th...

6 days ago | 0

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Answered
can not run the file
When you say "it write[sic] error 5 when I run it", do you mean you receive License Manager Error -5 when you try to start MATLA...

6 days ago | 0

Answered
Optimization Toolbox Functions Available to Matlab Coder
The blue bar labeled "Documentation" near the top of the main documentation page for each MathWorks product should have a link t...

7 days ago | 1

| accepted

Answered
Anonymous function to class property method.
Note: you shouldn't call your class bar as that already has a meaning in MATLAB. Use this: fmincon(@(x) objfun(o.myfoo, x),x0,...

9 days ago | 0

| accepted

Answered
Use multidimensional Indices returned by max to get values from another array of same size
If you're using release R2019a or later, specify the 'linear' option to obtain linear indices from max and use those linear indi...

9 days ago | 0

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Answered
How to get multiple outputs from a function?
Retrieving two outputs from a function requires two steps. Define the function to return two outputs Call the function with tw...

9 days ago | 1

Answered
MATLAB script to simulate the sound of dialling any telephone number
If you just need a function that can play that sound, Cleve Moler's Numerical Computing with MATLAB toolbox (available from the ...

9 days ago | 0

Answered
Is there a way to add synchronize function to Matlab 2016a?
As Adam Danz said, this function was released in release R2016b. It also only works on timetable arrays, not table arrays, as yo...

9 days ago | 1

| accepted

Answered
Looks like a machine error
Your variables appear to contain the same values as the hard-coded constants, but looks can be deceiving. The small differences ...

9 days ago | 0

| accepted

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