Community Profile # Steven Lord

### MathWorks

5,620 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
Why is logical array fasle?
Floating point arithmetic. While k1 and g are displayed the same they do not contain the same value down to the last bit.

4 hours ago | 0

Answered
Computer crashed when calculating matrix (mixed with sparse and full) multiplication and summation
What release of MATLAB are you using? What operating system? I'm suspect you're going to say Linux. If I'm right, the OOM Kille...

6 hours ago | 0

Answered
curve fitting tool plot is different from my plot
Show us the code you used to create your plot. Did you use the full double precision values of the coefficients stored in the f...

6 hours ago | 1

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Curve fitting tool error with custom equation
Does your data contain a point with x = 0? If so the term c*(1/x) is going to give you Inf or NaN (depending on whether or not c...

8 hours ago | 1

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Answered
What does vdp stand for? (Mathworks Example Simulation Model)
The vdp model is a simulation of the Van der Pol oscillator differential equation. It's a fairly simple model to create which is...

8 hours ago | 0

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change of time in ode45
If the right hand side of your system of differential equations involves the solution at a previous time you don't have a system...

23 hours ago | 0

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Is there a way to access array elements returned by a function directly
What you've written is not valid MATLAB syntax. You could do something close to what you want using a helper function. valueAt ...

1 day ago | 0

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Operations by matrix disease: 1.000.. - 1 is not equal to zero
Welcome to the world of floating-point arithmetic. Please try this little experiment. Find something to write with and somethin...

1 day ago | 0

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How can I not count some rows within X,Y columns that contain X>=3 to alter the bin counts of Y for a histogram?
If I understand your goal correctly I think you want to call histogram with the 'BinLimits' name-value pair.

1 day ago | 0

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How to solve A*x=0 in Matlab?
Use the null function, but remember the zero vector will also be a solution.

2 days ago | 0

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What is this assignment statement attempting to do?
This calls the meanX function with raw_data as input and returns two outputs. We can speculate as to what meanX does from its na...

2 days ago | 0

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Kindly any one help me regarding MATLAB GUI guide execution of my research work?
If you want to plot into an axes in your GUI, why are you explicitly creating a new figure? figure; hold Specify the handles o...

2 days ago | 0

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Proof eigenvector matches to a given matrix
What is the definition of the eigenvector of a matrix? Can you demonstrate that A and b satisfy that definition?

2 days ago | 0

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What is the Best Way to Deal with an Empty Line Object?
x = 1:10; y = 1:10; i1 = x<=3; i2 = x > 100; i3 = x >= 7; hold on plot(x(i1),y(i1),'r','DisplayName', 'first'); plot(x(i...

3 days ago | 0

Answered
Unable to resolve the name phased.internal
See Bug Report 2470530. Apply the workaround given in that bug report or fix it by installing release R2021a Update 2 if possibl...

3 days ago | 2

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Answered
Using a loop to replace spaces for underscore
Use the replace function. before = 'Hello world' after = replace(before, ' ', ' cruel ')

3 days ago | 0

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How do I specify time increment in computation in for loop?
for loops can iterate over arbitrary vectors, not just 1:something. x = 1:0.5:5; for k = x fprintf("The value of k is %f....

3 days ago | 0

Answered
how to determine efficiency centrality of a node in Matlab
Build a graph or digraph representation of your network and call centrality on it. Depending on how you define "efficiency" you ...

3 days ago | 0

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Strange behaviour of a function handel
According to Google Bill Gates has a net worth of 126.5 billion USD. If you saw him on the street and handed him a \$20 bill, wou...

3 days ago | 0

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Answered
How to solve "Maximum recursion limit of 500 reached." error
You've created a script file clc.m that tries to call the built-in clc function on its first line. The clc.m you've created take...

3 days ago | 1

Answered
How to use the random variables Xt (outcomes of a dice roll) to define another random variable T5 ?
I wouldn't use rand here. I'd use randi to directly generate the values of the fair die roll. [If you were later going to simula...

3 days ago | 0

Answered
How can I write this complex equation in matlab? in order to find i1 & i2
See this documentation page.

4 days ago | 1

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Answered
Could anyone please help me with an example of LSTM network matlab code.
One of the "Related Topics" listed at the end of the documentation page to which I linked in my comment on the question is "Time...

4 days ago | 0

Answered
limit of a function is giving another limit
Let's look at your function. syms y z_0 = 2; z_1 = 3; lambda = 4; fun2 = 0.5.*(1./(y.^2)).*besselj(0,(2.*pi./lambda).*(1./y...

5 days ago | 0

Answered
Date stamp on plot
plot(1:10, 1:10) title("This plot was created at " + string(datetime('now')))

5 days ago | 0

Answered
Cubic spline interpolation in interp1 doesn't remove NaN
The fillmissing function offers several methods to use in filling in the missing data (NaN in the case of your numeric data.) On...

5 days ago | 0

Answered
How to remove null matrices from a multidemensional array?
Use the capability of the any function to accept a vector of dimensions over which to operate. z = zeros(3); r = @() rand(3); ...

5 days ago | 0

Answered
"Highlight" a vertical gridline on a figure
There are a couple possible ways to do this. Off the top of my head the one I'd probably use is to set the YAxisLocation propert...

6 days ago | 0

Answered
I want to create a square wave shows in the Picture
Looking at the Plots tab of the Toolstrip, the thumbnail that looks closest to the picture that you posted is the stairs functio...

6 days ago | 0

Answered
How to combine matrices with different size but preserve elements with same value?
None of A, B, or C have four columns like you stated you had. You didn't indicate how you generated C from A and B, but one way...

6 days ago | 0

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