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Steven Lord


MathWorks

3.608 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
Variable assigns value but wont plot
If you want to add points to your line one by one as your loop iterates you could create an animatedline before entering your fo...

alrededor de 1 hora ago | 0

Answered
deleted old version of Matlab (R2017b) keeps getting back
Do you have some automated process that restores the Applications folder from a backup like Time Machine? If you're in a corpora...

alrededor de 2 horas ago | 0

Answered
concatenate column values in a vector
Treat v1 as the coefficients of a polynomial and evaluate that polynomial for x = 10. v1 = [ 1,0,1,0]; v2 = polyval(v1, 10)

alrededor de 21 horas ago | 1

Answered
errors in training deep learning network from matlab help system examples
Which release of Deep Learning Toolbox or Neural Network Toolbox are you using? How does this example appear (or does it appear...

alrededor de 24 horas ago | 0

Answered
Why pcbstack layers not aligned?
This might be related to Bug Report 2066356 as Hyma Harish Vallabhapurapu posted, but it could also be related to Bug Report 207...

1 día ago | 0

| accepted

Answered
Using bsxfun for non-numeric data
For this specific example, you can now take advantage of implicit expansion and the string type. >> a = {'aa', 'bb', 'cc'}; >>...

1 día ago | 1

Answered
What to do if I want make parameters a vector in a ODE23?
There's an example on the ode23s documentation page (open this by typing doc ode23s in the MATLAB Command Window) for how to pas...

1 día ago | 0

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...

2 días 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...

2 días 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...

2 días 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...

2 días 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...

3 días ago | 0

| accepted

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...

3 días 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...

3 días 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...

4 días 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...

4 días 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 ...

5 días ago | 0

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

6 días 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...

6 días 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...

6 días ago | 0

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

6 días 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...

6 días 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...

6 días ago | 0

| accepted

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...

7 días 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 ...

7 días 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 ...

7 días 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...

7 días 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...

7 días 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...

7 días 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...

8 días ago | 1

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