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Steven Lord


MathWorks

3,020 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
importing large 4GB+ tab-delimited ascii file makes MATLAB crash
Consider making a tall array or perhaps using memmapfile. These tools are linked from this documentation page. Please also send...

3 days ago | 0

Answered
Drawing out a graph, animating a 2-d graph in MATLAB
Use the functions and techniques described on this documentation page. The easiest would probably be comet or animatedline.

3 days ago | 0

Answered
What are my options for compiling Statistics on Missing Data Values
See the functions and topics related to missing data on this documentation page. For your stated tasks ismissing should be suffi...

3 days ago | 1

Answered
Array is stopping at lower variable count
for w=numel(Folders) This "loops" over one value, which means you're only going to access the files in the last element of Fold...

3 days ago | 0

Answered
ode output function problem
As documented in the odeset function documentation page the function you specify as your custom OutputFcn must have a certain sy...

4 days ago | 0

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Answered
using a vector/array as a counter in a for loop, or while loop?!
Rather than creating and deleting the line each time, why not use one of the animation tools and/or techniques shown on this doc...

4 days ago | 0

Answered
Calculate mean from daily to monthly values
Use the groupsummary function or store your data in a timetable and use retime on that timetable.

4 days ago | 0

Answered
Upgrade Matlab version/server out of maintenance
Please send this licensing question directly to the Sales department using the telephone icon in the upper-right corner of this ...

4 days ago | 0

Answered
How to create a planar STL in PDE Modeler?
You can look at the PlateHolePlanar.stl file being imported by that example. edit PlateHolePlanar.stl It looks to me like the ...

5 days ago | 0

Answered
how can i find convex and concave points
Depending on what you want to do with this information (which is not clear from the question) you may find the ischange function...

5 days ago | 1

Answered
Define a new fitting function
Is your data stored as row vectors? If so, transpose them (using the .' operator) to be column vectors in your call to fit.

5 days ago | 1

| accepted

Answered
findLobes function on MATLAB_2019a
In order to use the findLobes function in Antenna Toolbox, its first input must be a polarpattern object. When you call findLobe...

5 days ago | 1

Answered
Formulation to Matlab code
There's no need to loop. The log and log10 functions can operate on arrays of data, and as long as you use element-wise multipli...

6 days ago | 0

Answered
How can I which value that be used to calculate a function
Since you indicate that you're using release R2019a, call min with the 'linear' option and two output arguments. This will give ...

6 days ago | 0

Answered
change colormap of histogram2
Use the colormap function. First let's make the histogram2 plot. x = randn(5000); y = randn(5000); h = histogram2(x, y, 'Disp...

7 days ago | 0

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Answered
Why is my if statement breaking when condition is not met?
'false' is not the same length as 'true' so this will error. 'false' == 'true' Since you said "my code just quits completely" ...

7 days ago | 1

Answered
Function 'subsindex' is not defined for values of class 'ss'
You have defined a variable named pole. pole=(Vdo*Ido)+(Vqo*Iqo); The following line is being interpreted as an attempt to in...

7 days ago | 0

Answered
I can not create my executable, since I am using the command for symbole variables "syms".
You cannot use Symbolic Math Toolbox functionality with MATLAB Compiler. It is an ineligible product. If you tell us or show ...

7 days ago | 0

Answered
Converting a table of mixed numeric-string content to an array
I recommend using writetable instead of using xlswrite. You can tell writetable to write to a spreadsheet file.

7 days ago | 0

Answered
I have to define ||Z||2,1 in matlab programming form.
Use the norm function to compute the 1-norm or 2-norm of a matrix or vector.

9 days ago | 1

Answered
ode45 with two 2nd order differential equation
See the Higher-Order ODEs example on this documentation page and use the technique it illustrates to turn your system of two sec...

9 days ago | 0

Answered
color plot arguments questions
That is using the plot(___,Name,Value) syntax where ___ is replaced by phi, eta * abs(J). 'Color' is listed in the Name-Value Pa...

10 days ago | 1

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Answered
i need R2011a_patch_1098655 to start 2011a
Please contact Technical Support using the telephone icon in the upper-right corner of this page and ask what to do to resolve b...

10 days ago | 0

Answered
How I do find PLP on Matlab 7?
See this Answer.

11 days ago | 0

Answered
Function converts numbers from command line to ASCII value
You're calling your function in command form. test 12345 This is equivalent to the following function form: test('12345') Se...

11 days ago | 1

| accepted

Answered
Apply Function to a Variable in Timetable
I want to multiply the entire column 'Latitude', which is the 3rd column in my data set, by -1. That's easy and doesn't require...

11 days ago | 1

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Answered
Uneven spacing between texts in command window?? help!!!
In the Environment section of the Home tab of the Toolstrip, select Preferences. Navigate to the Fonts item under MATLAB. What f...

12 days ago | 1

Answered
Double installation of one Matlab 2018 Student version
Before your first laptop dies, follow these instructions to deactivate MATLAB on that laptop, then install and active MATLAB on ...

12 days ago | 0

Answered
create y using x, without loop
This is complicated code, but it does satisfy the "one line, no loop" requirement. You will need to substitute 102 for the desir...

12 days ago | 3

Answered
I want to create a function that integrates
Let's address your questions in turn. First, why "Not enough input arguments"? intCP Not enough input arguments. Error in int...

12 days ago | 0

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