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Steven Lord


MathWorks

3,585 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
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...

2 hours 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 ...

2 hours 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 ...

2 hours ago | 0

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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...

3 hours ago | 0

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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...

3 hours ago | 0

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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...

3 hours ago | 0

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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...

21 hours 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...

23 hours ago | 0

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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...

23 hours 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...

1 day ago | 0

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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...

1 day 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....

1 day ago | 0

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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...

1 day 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...

1 day ago | 0

Answered
How do you solve for a double sum
h=0; i=0.0195314; m=100 for m=1:512 for j=1:n for i=1:n-m h=h+(z(i+m,j)-z(i,j))^2; end end h=1/(n...

1 day ago | 1

Answered
ActiveX: how to pass a string array to cst in matlab?
sWidth={"0.5";"1.1";"2.2";"3.3"} The error message is accurate in that sWidth is not a string array. It is a cell array whose c...

1 day ago | 0

Answered
Patner relationship and problem diskussing
You can contact MathWorks corporate headquarters using the information on this webpage.

1 day ago | 0

Answered
Count Days in Months
The "Specify Step Size", "Compare Fixed-Length Duration and Calendar Duration Step Sizes", and "Dates and End of Month" sections...

2 days ago | 0

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Answered
Visualizing flow through graph networks
Set the NodeCData property of the GraphPlot object. p.NodeCData = G.Nodes.Value; colorbar % to see the mapping between value...

2 days ago | 1

Answered
Change distance between grouped bars (bars are overlapping)
From the documentation for the bar function, specifically the section that deals with the width input argument: "Bar width, spe...

2 days ago | 0

Answered
Graph visualization adding white to my nodes. How to solve it?
Can you check if there's an update available for your graphics driver? If not, did this behavior suddenly start appearing (afte...

3 days ago | 0

Answered
fplot command makes plot white
Those ought to throw an error. You can't multiply a function handle and a number. You can multiple the result you receive from e...

3 days ago | 0

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Answered
Why is help() malfunctioning
The output you posted for help doc doesn't match the help text I see when I run that command. Did you post exactly what you see ...

3 days ago | 0

Answered
How to develop a number selector using matlab app designer?
Do you need individual buttons for each digit, or would a uispinner or uidropdown that allows you to select a number between 0 a...

3 days ago | 0

Answered
Error: Unbalanced or unexpected parenthesis or bracket
DON'T USE eval unless you absolutely need to. [There are very, very few circumstances where you absolutely need to.] But let's ...

3 days ago | 1

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Answered
Run scripts with a script
genpath is a big hammer. Are you certain you actually need to use it? Looking at the message you received: Warning: Name is no...

3 days ago | 0

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Answered
Write a loop that sums and subtracts elements with a lower and upper limit?
Do you want to stop the loop entirely or do you want to saturate and continue on with the next iteration starting from the satur...

3 days ago | 0

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Answered
How to draw lines in matlab figure
You could either turn the grid on or use the xline and/or yline functions. plot(1:10); grid on xline(4.5, 'r:') yline(2*pi, ...

3 days ago | 0

Answered
Sub function error within main function
In general, when you're asking for help with an error you should show the full and exact text of the error message you receive. ...

4 days ago | 0

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