Steven Lord

MathWorks

Last seen: Today | 2002년부터 활동

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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How to add seconds to a HH:mm DateTime array ?
Do you want to actually add seconds to the value (changing the time) or do you want to add seconds to the display (leaving the t...

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pca function returns the wrong output in R2022a
Let's check that you're using the pca function included in Statistics and Machine Learning Toolbox. What does this command show?...

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What is the difference between int8(0x98), uint8(0x98), typecast(uint8(0x98), 'int8')
If you use the following syntax, you create a uint8 value and then cast that value to int8. Since the uint8 value is larger than...

1일 전 | 2

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double conditional in one line
At the beginnnig looks like weird >> x=0.23: 0<x<1 This does not ask the question "Is x between 0 and 1 exclusive?" It is inst...

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"y-direction of the coordinate system should be reverted"
Images and "regular" plots have different conventions for whether the Y axis should be increasing or decreasing as you move towa...

2일 전 | 0

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Couldn't find helperVisualizeScene() function
Open the example in MATLAB using the command that gets copied to the clipboard when you press the "Copy Command" button. MATLAB ...

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comparison between a string/or cell and categorical data
MATLAB is correct. Sis(1).Trading = 'As Is' Trading(1) = categorical({'As is'}) Sis(1).Trading==Trading(1) If you used a cap...

3일 전 | 1

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Error using image Color data must be an m-by-n-by-3 or m-by-n matrix. Error in imagesc (line 52) hh = image(varargin{:}, 'CDataMapping', 'scaled');
As the error message says, the image data you pass into imagesc must be a matrix (if it's an indexed image or a grayscale intens...

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How to create a "scatter" matrix without using a for loop?
row = [1,2,3]; col = [2,4,4]; val = [123,321,456]; M = accumarray([row.', col.'], val.', [4 4])

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Code protection in deployed standalone application
See this documentation page for more information about the deployable archive and the Wikipedia page for more information about ...

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receiving different training results while running the same code
Are random numbers involved in the process of creating or training your RL model? [My guess is most likely yes.] One way to chec...

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Accelerate a loop involving the built-in integral command
Assuming that params doesn't change, consider using the memoize function to create an object you can use in your integrand funct...

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PSO does not satisfy the nonlcon inequality constraint and gives solutions less than LB
Have you considered using the particleswarm function in Global Optimization Toolbox, either as your main solver or to help you d...

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Can't use pca() function - Error using statset No default options available for the function 'pca'.
Let's make sure you're using the pca and statset functions included with Statistics and Machine Learning Toolbox rather than oth...

5일 전 | 0

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Plotting different sized vectors
If you have an idea in your mind of roughly what you want the plot to look like, open the Plots tab of the Toolstrip and click t...

6일 전 | 0

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How to convert time in microseconds (queryperformancecounter(qpc)),import from an excel file, to time (hh:mm:ss)?
You can convert a number of microseconds into a duration or (if you know the epoch time) into a date and time value. M = 168892...

6일 전 | 0

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Looping scatteredInterpolant across each frame in 3D matrix
Using the variable names given on the scatteredInterpolant documentation page, do you mean that your xgrid variable is the x inp...

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How to run .m file through terminal on linux ?
Try starting MATLAB with the -batch option.

7일 전 | 0

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examples in the vision toolbox fail to load .mat files
The pointCloud function is part of Computer Vision Toolbox and was introduced in release R2015a. Do you have this toolbox instal...

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Creating a polar histogram with x values (bins) that will appear on the graph even though no values fall into those bins?
Do you need the histogram to be on a polar axes? If so use the polarhistogram function. x = deg2rad(randi([0 270], 1, 1e6)); p...

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Some Robot models are missing from the Robotics System Toolbox.
According to the Release Notes the puma560 robot model was introduced in release R2023a. You're using release R2022b, the releas...

7일 전 | 1

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Retime for custom timestep (6 hour)
You're using this syntax from the retime documentation page: "TT2 = retime(TT1,'regular',method,'TimeStep',dt) calculates regul...

7일 전 | 0

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DE (f) has wrong solution
Your code calls ode45 with an output argument but then doesn't use that output argument later in the code. In addition you're ca...

7일 전 | 0

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Process .dat file, plot, scale, and put back into similar format
You may want to interactively experiment with the various options for importing your data in the Import Tool. You can specify th...

8일 전 | 0

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Creating a Dynamic Variable for Table Names
Can you dynamically create variables with numbered names like A1, A2, A3, etc.? Yes. Should you do this? The general consensus ...

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How to request the development of a new support package?
If you're requesting support for a new type of hardware, see this page. If you're requesting a different type of support packag...

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code fft for matlab function block
Are you sure you intended to take the fft of the input argument S? From the error message that input is a scalar (or a length th...

12일 전 | 0

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How to label nodes in a plot?
This matrix looks similar to the one from one of your previous questions. If that's the case, and you plotted the graph object, ...

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Does the current Symbolic Math Toolbox still use the MuPAD as its underlying implementation?
What was removed was the MuPAD Notebook interface, not the symbolic computation engine. Is there a specific reason you are inte...

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Execution of script image as a function is not supported
You've likely created your own image.m file that's taking precedence over the image function included in MATLAB. To check this r...

13일 전 | 0

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Steven Lord

MathWorks

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