Steven Lord

Last seen: 1 día ago

MathWorks

5.044 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
Do anyone know how to graph your function in the interval from x=0 to inf
The fplot function allows you to specify the range of x over which you want your function to be plotted. syms x fplot(sin(x), ...

alrededor de 13 horas ago | 0

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Answered
Solution to time and space dependent ODE
See the ode45 function and the example on its documentation page that discusses passing additional parameters into your ODE func...

alrededor de 13 horas ago | 0

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-If else- conditionals in matlab app.designer?
Compare: 'ac' == 'ad' % returns a 1-by-2 logical array 'ac' == "ad" % returns a 1-by-1 logical array When you compare two cha...

alrededor de 13 horas ago | 1

Answered
nlinfit command problem :(
From the error message: "Weights must be a vector of real positive weights ..." Are they? Is dA a vector? Check with isvector. ...

alrededor de 15 horas ago | 0

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How do I input and solve a system of differential equations in matlab
I recommend you visit the Ordinary Differential Equations category in the documentation. Several of the Topics pages listed in t...

1 día ago | 0

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User inputs for publish
To me, publishing is intended as a non-interactive activity. You should be able to start the publishing process, go get a cup of...

1 día ago | 1

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How does mat2cell work?
Let's try this with a slightly smaller matrix, so you can see what's going on. A = reshape(1:24, [3 8]) Let's slice this into ...

1 día ago | 0

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Answered
How do I do a Matlab assignment (report)?
Assuming this is homework, you should probably ask your professor about the format of the report they expect you to submit. You...

2 días ago | 0

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I have a question
You did not end the command you executed immediately before calling imshow(d) with a semicolon. I'm guessing that command was a ...

3 días ago | 1

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how do I generate new random number every time I run a exe file?
See this documentation page that discusses why random numbers repeat after startup.

3 días ago | 0

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How to interpolate under specific condition?
If you were using release R2020b or later, I would recommend calling the fillmissing function with the 'MaxGap' option. I'm leav...

3 días ago | 1

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Different results for the same equation
lambda(1) is displayed the same as lambda(3) but its value is not identical to the value of lambda(3). A = [-10 10 -15; 10 5 -3...

3 días ago | 0

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Plotting a random walk step by step
You're adding a new line to the axes each time you want to put a new point down. That's numberOfWalks times stepsPerWalk differe...

3 días ago | 0

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Error with validate attribute
Nowhere in your message did you show the error you received. Please show all the text displayed in the Command Window in red and...

3 días ago | 0

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Answered
calculate a grade of students
%purpose is showing grades of 102 students and assign a letter grades %the grades will be random numbers between 0 to 100 clc;...

3 días ago | 1

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Unit testing with externally configurable parameters.
Write a parameterized test whose parameter is the port name. Inject a value for that parameter into the test when you create the...

4 días ago | 0

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Answered
C++ to matlab, anybody can help?
Are you trying to solve the same type of problem the matchpairs function does?

4 días ago | 0

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Ploting a Histogram with two data sets (One data set with respect to the other).
Do you want a 2-D histogram? x = [-9.3185, -9.2809,-9.2079,-9.1043,-9.1989,-9.1040,-9.1865,-9.0970,-9.0852,-9.0967,... -9....

4 días ago | 0

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Answered
square root of pi
I would have both the Area and Diameter properties depend upon a third (maybe public, maybe internal) property. Setting either A...

4 días ago | 0

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Create datetime from two columns of a table
I would use synchronize for this task. Let's start with some table data. v = (0:9).'; datePart = repmat("02-01-20", 10, 1); t...

4 días ago | 0

Answered
How do you pass a variable between two different matlab apps
Have you tried following the procedure shown on this documentation page?

4 días ago | 0

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Changing the initial variables when passing into an ode45 solver
I would call the ODE solver three times. First, solve over the time span [0, 20]. Next, use the final value from that first OD...

4 días ago | 0

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Answered
Only the real part of the complex number is displayed
I believe you're using the bank display format (format bank) which does not show the imaginary parts of numbers. What would $4.5...

4 días ago | 0

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Answered
Error: Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters
When you define a function the inputs must be specified as variable names in the definition. [Slight oversimplification, but goo...

4 días ago | 0

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Colors in Matlab as a vriable
Do you want your users to select colors by name or by appearance? If the latter use uisetcolor.

5 días ago | 0

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Location of plot for subplot(2,2,3)
For a subplot(2,2,3), the plot is located in 3-rd position in 2x2 matrix form. Up to now the plot is placed in the lower left c...

5 días ago | 0

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Portable version of Matlab
Two other options that I believe did not yet exist when this question was originally asked in 2015 are MATLAB Online and MATLAB ...

5 días ago | 0

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f(x) is different of f(value of x)
The value stored in an array is not necessarily the same value that is displayed. Right now Forbes magazine lists the net worth...

6 días ago | 0

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I can't install Matlab on my M1 Mac mini.
See this post.

7 días ago | 0

Answered
Conditional with time in ode45
Solve the system from time t = 0 to time t = 300 with the first value of upsilon. Use the value of the solution at t = 300 as th...

7 días ago | 1