Steven Lord
MathWorks
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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Content Feed
How to view the source code of "Delaunay" function?
which -all delaunay We do not distribute the source code for functions that are built into MATLAB like delaunay. If you want to...
約19時間 前 | 0
How to reshape data long version table in MATLAB into wide version table for more in deep repeated measures statistical analysis?
It's not completely clear to me what you want your "wide version" of that table to look like, but I suspect the stack and/or uns...
1日 前 | 0
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I need a function or equivalent code fgetl, but it is very fast.
Are you sure that fgetl is what's taking the time? Or are you trying to read data one line at a time from a file and storing eac...
2日 前 | 0
Separate date and time
dt = datetime('now') % Sample data theTime = timeofday(dt) theDate = dt - theTime % or theDate2 = dateshift(dt, 'start', 'day...
2日 前 | 1
Look for string in table and return a number in the same row different column
I'd probably use matches for text data (and the normal relational operators for numeric data.) load patients P = table(LastNam...
2日 前 | 0
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Invalid expression error when I try to introduce new variable.
It's likely (in the absence of nested functions) that the statement on line 407 is not inside any function. The end on line 405 ...
2日 前 | 0
Install a toolbox from command line?
I would probably use the silent installation process.
3日 前 | 0
Out of memory issue
sz = [196608 4096]; numberOfElements = prod(sz); bytes = 8*numberOfElements; gb = bytes/1024^3 Each subset is 6 GB in size (...
3日 前 | 0
change the first digits when ends with 5959
Is there a reason you're starting with string data first rather than using a duration array from the start? d = minutes(0:0.25:...
3日 前 | 0
How do I use a user input string to reference a structure that already exists?
I have multiple users with different structure names that need to use this. I want them to be able to input their structure name...
3日 前 | 1
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Issue with numerical integration of two variable function
A = @(x, y)cos(x)+sin(y); B = @(x, y)(A-integral(@(x)A, 0 , 2*pi)); Your expression for B won't work for two reasons. The inte...
3日 前 | 0
What is wrong with A = alter(a)?
which -all alter What function are you trying to call? From the tag can I assume you're trying to use Computer Vision Toolbox?...
4日 前 | 0
How to place NaN instead of " " / [ ] or empty field by using standardizeMissing?
My guess is that the data that was read into that 7th variable in your table was not numeric data but included data that MATLAB ...
4日 前 | 0
Is the Abstract keyword needed to make a method abstract?
That is valid syntax, but not for making my_method an Abstract method. What you've written tells MATLAB that my_method is implem...
6日 前 | 0
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Standalone application cannot read p-code?
Standalone apps cannot run any MATLAB code that was not included in the application at compile-time. From the documentation "MAT...
6日 前 | 1
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Tiny discussion on good practices in object oriented programming (OOP) through a simple example
First, having two classes whose names differ only by casing or by the difference between singular and plural seems likely to cau...
6日 前 | 0
Files generated during testing are not saved
I second Geoff Hayes's question about where you're creating these files. Are you putting them in a directory created using a Tem...
7日 前 | 0
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Retrieve curve fit coefficients
What "something else" are you planning to do with this fit information? There are a number of post-processing operations you can...
8日 前 | 1
Does Matlab support coding of embedded systems and robotics
Take a look at the Robotics and Autonomous Systems and Embedded Systems sections linked from the Solutions section of the websit...
8日 前 | 0
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How to save multiple output?
In your code: %{ for i = 1:m [A,x,y]=myfunction(I,vals(i,1), vals(i,2)); end %} is A always going to be the same size? If ...
8日 前 | 1
How to add black isolines for f(x,y) = -1, 0, 1
Use the contour or contour3 functions.
8日 前 | 0
Dealing with Data Structures
Can you create variables named impact_data0, impact_data1, impact_data2, etc.? Yes. Should you do this? The general consensus i...
9日 前 | 0
Warning: Function class has the same name as a MATLAB builtin. We suggest you rename the function to avoid a potential name conflict
You've created or downloaded a file named class.m that's preventing MATLAB from calling the built-in class function. Identify th...
9日 前 | 1
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Extracting value from Name-Value pairs using the Name string
test = struct('units', {'degrees_east', 'degrees_north'}, ... 'long_name', {'longitude', 'latitude'}) theNames = {test.lon...
9日 前 | 0
How do I get an Expression to Use the Value of a Variable that was Assigned after the Expression was Defined?
Use subs. syms z f = 2*z z = 4; f g = subs(f)
10日 前 | 0
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What is the equivalent of mmult of excel in matlab?
The * operator performs matrix multiplication, but in order for that operation to be mathematically defined you need to transpos...
13日 前 | 1
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Cut a graph ?
If the data to be plotted includes NaN, that point will not be plotted. x = 1:5; y = [1 2 NaN 1 2]; plot(x, y) axis([0 6 0 3...
13日 前 | 0
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Histogram occurences per age problem
Use the histogram function instead of histc.
14日 前 | 1
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How to assign strings and numbers to elements of the same matrix?
Do you need your data stored with mixed-type columns or would mixed-type rows work? If the latter, consider a table array. Resu...
14日 前 | 0
