# Steven Lord

### MathWorks

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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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Does Matlab automatically vectorize for loops?

In general we don't discuss what the JIT does internally as we don't want users to try to code against that always-moving target...

ungefär 10 timmar ago | 1

Can't run script in namespace directory

You can run a script in a namespace. You need to use the name of the namespace as part of the command, just like you would when ...

ungefär 12 timmar ago | 0

3d arrays Matrix multiplication with a vector

This wasn't an option when the question was asked originally, but since release R2020b you can use pagemtimes. Let's make a smal...

ungefär 15 timmar ago | 0

Converting Unix Timestamp to Date Time

Use the 'ConvertFrom' option in your datetime call. This tells datetime how to interpret the value you pass into it. I think you...

ungefär 16 timmar ago | 0

Incosistency Precision Value (decimal double) When using strcmpi/contains

If you're trying to determine if one number is contained inside another array of numbers, converting them to strings then using ...

en dag ago | 1

Passing output from a ButtonDownFcn callback function

Callback functions for Handle Graphics objects don't return output arguments. [Where would it return those output arguments to? ...

en dag ago | 0

scope marker to line

The Scope block in a Simulink model will plot the data that is passed into it. If you want the block's plot to show the signal l...

en dag ago | 1

How to count the number of scatter points of each color

Rather than creating one scatter plot for each individual point, I'd use that loop to create a vector of data that indicates in ...

3 dagar ago | 1

is matlab automatically updating xlim and ylim?

If you want to prevent MATLAB from automatically updating the axes limits when you add new data to the axes, set the XLimMode, Y...

3 dagar ago | 0

intarpulation on a sin wall

Just based on the code you showed, the main suggestion I have is not to recreate the scatteredInterpolant object every time. Jus...

5 dagar ago | 0

| accepted

Unexpected prompt characters on command line output

Rather than piping the contents of the file to MATLAB, do you see this same behavior if you use the -batch startup option listed...

6 dagar ago | 1

| accepted

Does fread use cast when reading non-integer byte data

MATLAB doesn't have a 14-bit integer type. The closest larger type is the signed 16-bit integer type int16. From the fread docum...

6 dagar ago | 0

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is there way to convert this python code to matlab code? how can i convert python code to matlab? this is the code that I want to convert:

Do you need to convert the code or do you just need to run the code? If the latter, see this section of the documentation.

8 dagar ago | 0

Average Calculation and Array in For Loop

When i is equal to 1, attempting to index into m with i-1 (otherwise known as 0) as an index would error if the short-circuit &&...

8 dagar ago | 0

Still waiting for my order to be processed

Please contact Customer Service directly using this link and ask about the status of your order.

8 dagar ago | 1

Flipping Sign provide wrong information and Answers

How exactly does this reordering "change the meaning of the equation"? The derivative of with respect to is . In this case, x ...

8 dagar ago | 2

| accepted

Find Number of Elements in an Array

Yet another way to do this: A = ['KM'; 'KL'; 'MN'; 'KM'; 'MM'; 'KL']; [counts, values] = histcounts(categorical(cellstr(A)))

8 dagar ago | 0

How can I verify an isomorphism relation between two graphs that join cube and octahedron vertices?

Build the two graph objects then call either isisomorphic or isomorphism on it. G_1 = graph([1 2 3 3 3 4 4 4 5 5 5 6...

9 dagar ago | 0

With the new ODE command (matlab 2024a), I'd like to parametrize the ICs and make, for example, x0=[p(1); p(5)] and then compute SENSITIVITIES!

If I understand what you're asking, I think you could just modify the Examine Parameter Sensitivity example on the ode documenta...

9 dagar ago | 0

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Opening a Figure from a Function - Not enough input arguments

This line of code: flowmeasurementfigure.Callback = {@flow_measurement,halfscreensizecentre,figurecolour} % ERROR ON THIS L...

9 dagar ago | 0

Discrepancy in functions between MATLAB versions

What does the following command show when run in each of the versions of MATLAB? which -all fit My guess is that you have Curv...

10 dagar ago | 0

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How to insert dash-line in a matlab figure?

You could use the yline function or you could set the axes properties YGrid and GridLineStyle. x = 1:10; y = x.^2; ax = axes;...

10 dagar ago | 0

missing "configure for app" in matlab 2019b app designer

According to the documentation page for appdesigner.customcomponent.configureMetadata this function was introduced in release R2...

11 dagar ago | 0

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I'd like to do various things, including controlling the dimensions of the plot box. What I do here with xlim, ylim, and zlim doens't work.

Instead of manually modifying the coordinates, I'd consider using the hgtransform function in conjunction with makehgtform.

12 dagar ago | 0

How to process the data that have same row name

Rather than trying to create a table with duplicate RowNames (which as you see from the error message is not allowed) I'd store ...

13 dagar ago | 1

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How to store users input in a file?

You want to open the file not in write mode ('w') but in append mode ('a'). See the description of the permission input argument...

13 dagar ago | 0

Adjusting Convex Hull Area

As an extreme example, what is the convex hull of a single point at the center of a pixel? It's the point itself, with size 0. T...

13 dagar ago | 0

Matlab equivalent to Java bigdecimal rounding of Half_up?

In release R2022a we added the argument TieBreaker (which can be used case insensitively) to control how ties are broken in roun...

13 dagar ago | 0

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Problem with polyfit command (R2015a)

From the polyfit documentation page: "[p,S,mu] = polyfit(x,y,n) performs centering and scaling to improve the numerical properti...

13 dagar ago | 2

Is Lisence "Matlab Basic Package" required to use license "Matlab embedded Coder Package"?

If by "Matlab[sic] embedded Coder Package" you mean the Embedded Coder product, the Product Requirements and Platform Availabili...

13 dagar ago | 1

| accepted