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Steven Lord


MathWorks

3 606 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
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)

ungefär 8 timmar 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...

ungefär 10 timmar 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...

ungefär 12 timmar 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'}; >>...

ungefär 12 timmar 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...

ungefär 23 timmar 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...

en dag 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...

en dag 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...

en dag 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...

en dag 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...

2 dagar 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...

2 dagar 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...

2 dagar 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...

3 dagar 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...

3 dagar 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 ...

4 dagar ago | 0

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

5 dagar 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...

5 dagar 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...

5 dagar ago | 0

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

5 dagar 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 dagar 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 dagar 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...

6 dagar 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 ...

6 dagar 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 ...

6 dagar 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...

6 dagar 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 dagar 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 dagar 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...

7 dagar 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...

7 dagar 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...

7 dagar ago | 1

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