Steven Lord

Last seen: Today

MathWorks

5,515 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
Conputation with symbolic elements
Call double (if the result doesn't contain any symbolic variables) or vpa (if it does) on the result. two = sym(2); y = (sqrt(...

8 hours ago | 0

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Answered
do you know the difference between set and set_param
The set_param function is intended to set parameters of Simulink models and Simulink blocks. The set function is intended to se...

4 days ago | 0

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How to remove outlier of time series signal data by using cubic spline interpolation?
Use > and < or the isoutlier function to determine where the outliers are located. Use filloutliers specifying 'OutlierLocation...

4 days ago | 2

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ODE 45 solution copying initial condition
Rather than handling M yourself in your ODE function consider specifying it as the Mass option using odeset. See this documentat...

4 days ago | 0

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textscan: Instantaneous out of memory error when accessing very large file (only with newest Matlab versions)
I recommend you look at the functionality in MATLAB to process large files and big data. The approach you've described sounds li...

4 days ago | 0

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How to increase the size of a matrix within for loop
Consider creating a cell array to store the pieces you want to be placed on the main diagonal. When you want to assemble the mat...

4 days ago | 0

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Applying probability concept using matlab
This uses several functions that didn't exist when the question was originally asked in 2012, notably discretize, histogram, and...

4 days ago | 0

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Need help in creating a code
Change the format you use to display the data. year=[1900:10:2000]; pop=[550 720 1265 2287 2756 3012 4086 5220 7478 10112 1422...

4 days ago | 0

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Disabled - No sandbox or build area path
Which release of MATLAB are you using? What operating system are you using? Search the bug reports for the release you're usin...

4 days ago | 0

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hold on y-axis
%I tried with this but it doesn't work % plot([2020-11-17 13:03:00 2020-11-17 13:03:00],[0 450],'g--') No, that's not going to...

4 days ago | 0

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Help with my SIR MODEL
Your function is defined to accept zero input arguments and return zero output arguments. function sir_model You can't call it...

5 days ago | 0

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What's the physical meaning of heatmap. Also, what is the meaning of the axis of heatmap( azimuth and elevation)?
A heatmap chart is just a way to display data using colors to show a general pattern of high and low data values. So I'm not sur...

5 days ago | 0

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In what version did certain colorbar properties change?
The PDF Release Notes go back to release R2012b. The document is 666 pages long. I suspect that a combination of size and freque...

5 days ago | 1

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Why do I get "complex" arrays?
If r contains only positive values and p contains only positive values, what about gamma? areALLElementsOfRPositive = all(r > 0...

6 days ago | 0

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Answered
activation code for matlab 2016
If you have purchased MATLAB in the past, you should have been sent the activation code at that time. You should be able to ask ...

6 days ago | 0

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problem with name=value syntax
That syntax is intended as a way to specify name-value pair arguments. So instead of: plot(1:10, 1:10, 'Marker', 'o', 'LineStyl...

7 days ago | 2

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Answered
Script to remove polynomial/quadratic error off CSV data
The detrend function and/or the Remote Trends task may be of interest or use to you.

7 days ago | 0

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I need help with my thesis
The wblpdf function is part of Statistics and Machine Learning Toolbox. Check the information displayed by the ver function to d...

7 days ago | 1

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Changing Keyboard shortcuts in App Designer in MacOS
Go to the Preferences in the Environment section of the Home tab of the Toolstrip. Under MATLAB navigate to Keyboard then Shortc...

9 days ago | 0

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how take a mathematical function from user
What do you mean when you say you want "the user to enter" the function in your comment? Do you want the user to have to pass s...

9 days ago | 0

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Can you organize scatter plot points?
When I look at your plot it looks to me an awful lot like the boxplot thumbnail in the Plots tab of the Toolstrip. You may want ...

10 days ago | 0

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How to generate random graph of n vertices with random connections in matlab
Take a look at the sprand and sprandsym functions.

10 days ago | 0

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how to integrate a product with function handle
You can't calculate the product of a number and a function handle. What you can do instead is calculate the product of a number ...

10 days ago | 0

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Creating a new column in a table which is true or false
rng default id = (1:10).'; SIC = randi(3, 10, 1); t = table(id, SIC) t.is1or2 = ismember(t.SIC, [1 2])

11 days ago | 0

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Answered
Getting the error as "Undefined function or method 'syms' for input arguments of type 'char'" when trying to use syms
You likely don't have Symbolic Math Toolbox installed and licensed. Check the output of the ver function to see if it's installe...

11 days ago | 0

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How to know the value of a variable in a past time in Simulink?
I think you want a Unit Delay block.

11 days ago | 0

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Answered
index in safe-title
Try: str = "title_" + t{n} saveas(gcf,str,'jpeg') This will attempt to convert t{n} into a string and concatenate the string ...

11 days ago | 0

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Answered
Where can I find the dijkstraShortestPaths() function?
We do not distribute the source code for that function. What type of modification were you hoping to perform on that function? ...

12 days ago | 0

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Answered
Vector sum of forces
Use the vecnorm function.

12 days ago | 0

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Error using sub2ind Out of range subscript how to solve this?
What's the index of the value in row 1, column 6 of a 4-by-5 matrix? sub2ind([4 5], 1, 6) Trick question, since a 4-by-5 matri...

12 days ago | 0