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Steven Lord


MathWorks

3,601 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
Undefined function 'updateSystem' for input arguments of type 'matlab.ui.Figure'.
Your filterPlot function returns the handle to a MATLAB figure. According to its documentation page updateSystem requires its fi...

5 hours ago | 0

| accepted

Answered
App Designer - unit of "position" property
The documentation states that the Units property is 'pixels'. What's the value shown for the ScreenPixelsPerInch property of the...

7 hours ago | 0

Answered
matlab graph using excel data
Import the first set of data and generate the figure as you want it to appear. Once you have set up one figure, generate code th...

8 hours ago | 0

Answered
How can I select y data given a certain x value?
What you're seeing is the first example in the "Avoiding Common Problems with Floating-Point Arithmetic" section on this documen...

8 hours ago | 0

Answered
Coding vectors in matlab
Nowhere in your code did you define a variable named v, so line 4 of the code you posted should (and will) throw an error. Did y...

1 day ago | 0

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Answered
Match datetime within 3 seconds from two tables of different sizes
Use withtol. Let's use a sample timetable generated using the example from the help: MeasurementTime = datetime({'2015-12-18 08...

1 day ago | 0

Answered
Problem using interp1 with a sharp change in the data
Try using ischange to detect these sharp changes in your data and interpolating using only data in the same "piece" of your curv...

1 day ago | 0

Answered
2 nearest neighbors of each side of vector
Are there specific operations you want to perform on those neighbors? The moving statistics functions on this documentation page...

2 days ago | 0

Answered
Working With Matlab Tables
Use parentheses to extract a smaller table from a larger table or to assign a smaller table into a larger one. Use curly braces...

2 days ago | 0

Answered
Error when trying to modify a code (vectors)
You can directly use the elements of a vector through indexing. You don't need to extract them into separate variables. w = [1 ...

3 days ago | 0

Answered
Reset the order of table columns
If you're using release R2018a or later you could use the movevars function.

4 days ago | 0

Answered
missing toolboxes for function year
There is a year function in Financial Toolbox, but if you're working with date and time data I recommend storing your date and t...

4 days ago | 0

Answered
overly convoluted elseif condition
The approaches suggested by Bob Nbob and ME each work if the only values x can take in the range [1, 4] are integer values. If i...

4 days ago | 0

Answered
in matlab 2017a simulink is not open
See this Answers post.

4 days ago | 0

Answered
How I do evaluate a function handle in other function handle
g_1=@(x,y) y_p*p_y(f,x,y) + p_x(f,x,y); g_2=@(x,y) y_p*p_y(g_1,x,y) + p_x(g_1,x,y); . . . g_n=@(x,y) y_p*p_y(g_(n-1),x...

4 days ago | 0

Answered
How to apply netting in Adjacency matrix
This sounds like it might be a homework assignment, so I'm only going to give a hint. The transpose operator .' may be of intere...

4 days ago | 0

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Answered
Error in constrained delaunay triangulation
In a delaunayTriangulation, the constraint input C does not contain the coordinates of points that define a constrained edge but...

5 days ago | 0

Answered
Function definitions are not permitted in this context - Decoding_Toolbox
The ability to define local functions in scripts was introduced in release R2016b. Are you using an older release? If so you'll ...

5 days ago | 0

Answered
Matlab doesn't "Pause on Error" till Infinite recursion
Try setting a breakpoint on line 237 of wPLI_openfield. When MATLAB reaches that point, it will enter debug mode and the prompt ...

5 days ago | 1

| accepted

Answered
How to plot3D with inverse of matrix involved?
Look at the X and Y limits on your MATLAB plot, then look at the X and Y limits on the plot from Wolfram Alpha. MATLAB is givin...

5 days ago | 0

Answered
quadratic fit tool wrong coefficients
Because your parameters are so large, I strongly encourate you to center and scale your data as shown in step 7c in the first ex...

5 days ago | 0

Answered
Can someone propose some code that will "connect the dots" using circular arcs?
Are you trying to do something like path planning for an autonomous vehicle, passing through waypoints along the way? If so cons...

5 days ago | 0

Answered
defining a stuct variable
From the documentation for the struct function, when you have multiple fields being created in the same struct call: "If any of...

6 days ago | 1

Answered
List of built-in data sets, please
What do you consider a data set? The census MAT-file in toolbox/matlab/demos (used here among other places) seems like it's o...

6 days ago | 0

| accepted

Answered
Name a few variables from a vector
There is a function named deal that looks like it does something like what you're asking, but that assigns each of its inputs to...

6 days ago | 1

Answered
Command for setting MATLAB font preferences
Depending on which release you're using, use the settings function. In particular, you can set a TemporaryValue or PersonalValue...

6 days ago | 0

| accepted

Answered
Destruction of partially constructed class?
In this case you probably want to define a destructor (delete) method that supports destruction of partially constructed objects...

6 days ago | 0

Answered
Unrecognized function from Robust Control Toolbox
There's no syntax listed on the documentation page for the mixsyn function that shows it being called with zero input arguments....

6 days ago | 0

Answered
Unspecified coefficients from function 'fit'
Lowess smoothing is a type of nonparametric fitting. That output appears correct. There are other methods you can use if you wan...

6 days ago | 0

Answered
Can someone tell me what is wrong with this?
I'm guessing from the fact that you define x1 but don't use it that the x variable may not exist. You may have been thinking / h...

6 days ago | 0

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