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Steven Lord


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MathWorks

3.746 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
How could i call java function from matlab?
See the Topics on this page from the documentation.

etwa 23 Stunden ago | 0

Answered
How to manipulate array?
For the specific example of the size function, if you want to know the number of columns in the input array, tell size that you ...

etwa 23 Stunden ago | 0

Answered
Mysterious "Operands to the || and && operators must be convertible to logical scalar values." error
Can you check to confirm that you haven't written your own functions named isempty, strmatch, or not that are shadowing the func...

2 Tage ago | 0

Answered
Single-precision unit-spaced vector without conversion from double
Don't create the vector as a double array then convert the vector to single. Convert the scalar values from double to single th...

2 Tage ago | 1

| accepted

Answered
Replace -99 with NaN
Consider using the standardizeMissing function. The first example on that documentation page does exactly what you described.

3 Tage ago | 0

Answered
Assigning values to the array of Enumeration Class seems to be very slow
Why are you initializing all the elements in gps_state to GpsState.Lost in one call them immediately overwriting them with GpsSt...

3 Tage ago | 0

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...

4 Tage ago | 0

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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...

4 Tage 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...

6 Tage 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...

6 Tage ago | 2

| accepted

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...

6 Tage 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 ...

6 Tage 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...

6 Tage 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...

7 Tage 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 ...

7 Tage 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...

7 Tage ago | 1

| accepted

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...

8 Tage 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...

8 Tage ago | 1

| accepted

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...

8 Tage 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...

8 Tage 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...

8 Tage ago | 1

| accepted

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

9 Tage 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...

9 Tage 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...

9 Tage ago | 0

| accepted

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...

9 Tage ago | 0

| accepted

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...

9 Tage 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...

9 Tage 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...

10 Tage ago | 0

| accepted

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...

10 Tage 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...

11 Tage ago | 1

| accepted

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