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Steven Lord


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MathWorks

3,743 2002 年以降の合計貢献数

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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Single-precision unit-spaced vector without conversion from double
Don't create the vector as a double array then convert the vector to single. Convert the scalar values from double to single th...

約1時間 前 | 0

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Replace -99 with NaN
Consider using the standardizeMissing function. The first example on that documentation page does exactly what you described.

約17時間 前 | 0

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Assigning values to the array of Enumeration Class seems to be very slow
Why are you initializing all the elements in gps_state to GpsState.Lost in one call them immediately overwriting them with GpsSt...

1日 前 | 0

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Why I got the error "Undefined operator '.*' for input arguments of type 'function_handle"?
You can't multiply a function handle, which is what s returns. If you intend s to evaluate the function handle RCac, just make i...

2日 前 | 0

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eliminating NaN values from an array
In newer releases you can use rmmissing to remove missing data (NaN for double and single precision data, <undefined> for catego...

2日 前 | 0

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Proper Treatment of Symbolically Linked Script in Editor
Why not just add the directory containing the original preprocessing script file to the MATLAB search path? That will make it ca...

4日 前 | 0

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Getting the linear portion of a non-linear curve
The ischange function may be of use to you. Depending on what you're planning to do with this data the detrend function may also...

4日 前 | 2

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Save Open State in Editor???
In the Preferences for MATLAB, there's a section titled Editor/Debugger. One of the options that you can select (and I believe i...

4日 前 | 0

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HEEELP : Index in position 2 is invalid. Array indices must be positive integers or logical values. !!!! why???
center=(length(y))/2; for i=1:length(lambda) opticaxis(i,:)=E_z(:,center,i)'/(max(E_z(:,center,i))); end If ...

4日 前 | 1

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How can I initialize nested handle class with independent values
The section titled "Initializing Properties to Handle Objects" on this documentation page states what happens when you initializ...

5日 前 | 1

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How do I Ctrl-R on Mac?
FYI to search for or customize the keyboard shortcuts, see the Keyboard preferences as described on this documentation page. Sea...

5日 前 | 0

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Matlab licensing administration questions
I recommend that you contact Technical Support directly with these questions, as they should be able to offer guidance specific ...

5日 前 | 0

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Why does categories(TableA.Var2) have more elements than the rows in TableA?
Your CarLineFaultCodes table only contains a subset of the rows of FaultCodesTable, and your ModuleFC table only contains a subs...

5日 前 | 1

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Multiplication of two fields in a structure array
You made a typo on this line. Struct(i).dy_dc=(Struct(i).L1).*(sin(Struct.(i).phi1)); There shouldn't be a period between Stru...

6日 前 | 1

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definite integral not giving exact answer
Compute your limits of integration symbolically to avoid roundoff error. f = sym(4)/5; a = acos(f); inner_int = int(r*sin(phi...

6日 前 | 1

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Convert Columns Arrays to numeric
Using the example from the timetable help text: MeasurementTime = datetime({'2015-12-18 08:03:05';'2015-12-18 10:03:17';'2015-1...

6日 前 | 0

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Parsing text files for Beginners
There are several ways to read this data in. While you can do this using a series of commands, an easier approach (especially if...

6日 前 | 0

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Initializing multidimensional array and dynamic expansion
Build your size vector first. Ideally you have an upper bound on the number of dimensions: upperBoundOnNdims = 10; sizeVec = o...

7日 前 | 1

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Grid overlay on "plots()"
You want to turn grid on? Use the grid function.

7日 前 | 0

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How to assign a class method as a ClickedCallback?
methods function h = get_save_handle( obj ) h = @obj.save; end end The name of the me...

7日 前 | 0

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Disp: "Dot indexing is not supported for variables of this type"
You've written or downloaded a disp.m file that's shadowing the built-in disp function. Run this code. which -all disp You wil...

7日 前 | 0

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Problem with if statement
If you want to check if element i of y is less than 2, that's not what your if statement says. It is checking all the elements o...

7日 前 | 0

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How to get the address of libpointer?
Why do you need or want to get the address? If you're looking to iterate through the array, just use the + operator as shown by...

7日 前 | 0

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Delete rows from a timetable with an specific criteria
See the "Select Rows with Logical Indexing" section on this documentation page for an example you can use as a model. That examp...

7日 前 | 1

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How to assign a symbolic variable to a location inside a matrix?
In your expression y(1, 1) = A the expression on the left of the equals sign refers to a double array while the expression on th...

8日 前 | 0

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can not run the file
When you say "it write[sic] error 5 when I run it", do you mean you receive License Manager Error -5 when you try to start MATLA...

8日 前 | 0

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Optimization Toolbox Functions Available to Matlab Coder
The blue bar labeled "Documentation" near the top of the main documentation page for each MathWorks product should have a link t...

9日 前 | 1

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Anonymous function to class property method.
Note: you shouldn't call your class bar as that already has a meaning in MATLAB. Use this: fmincon(@(x) objfun(o.myfoo, x),x0,...

11日 前 | 0

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Use multidimensional Indices returned by max to get values from another array of same size
If you're using release R2019a or later, specify the 'linear' option to obtain linear indices from max and use those linear indi...

11日 前 | 0

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How to get multiple outputs from a function?
Retrieving two outputs from a function requires two steps. Define the function to return two outputs Call the function with tw...

11日 前 | 1

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