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.
Statistics
RANK
17
of 242,970
REPUTATION
12,258
CONTRIBUTIONS
0 Questions
5,834 Answers
ANSWER ACCEPTANCE
0.00%
VOTES RECEIVED
2,042
RANK
480 of 16,987
REPUTATION
3,207
AVERAGE RATING
3.40
CONTRIBUTIONS
5 Files
DOWNLOADS
29
ALL TIME DOWNLOADS
31344
CONTRIBUTIONS
0 Posts
CONTRIBUTIONS
0 Public Channels
AVERAGE RATING
CONTRIBUTIONS
0 Highlights
AVERAGE NO. OF LIKES
Contribute at least one answer each month for 36 consecutive months
Awarded to Steven Lord on 02 Jul 2020
Your submissions were downloaded 30 or more times in a month
Awarded to Steven Lord on 01 Nov 2019
Your submission is selected as "Pick of The Week"
Awarded to Steven Lord on 09 Oct 2019
Your submissions received 10 five star ratings
Awarded to Steven Lord on 09 Oct 2019
Publish your first submission
Awarded to Steven Lord on 09 Oct 2019
Answer 10 questions that were unanswered for more than 30 days
Awarded to Steven Lord on 30 Nov 2017
Accept 20 answers given by other contributors
Awarded to Steven Lord on 20 Jul 2017
100 of your answers have been accepted
Awarded to Steven Lord on 20 Jul 2017
Provide your first answer ever to someone else's question
Awarded to Steven Lord on 20 Jul 2017
15-year anniversary Scavenger Hunt finisher badge
Awarded to Steven Lord on 09 Nov 2016
Solve a problem for the first time
Awarded to Steven Lord on 23 Jan 2013
Content Feed
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...
19 hours ago | 0
Separate date and time
dt = datetime('now') % Sample data theTime = timeofday(dt) theDate = dt - theTime % or theDate2 = dateshift(dt, 'start', 'day...
19 hours ago | 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...
21 hours ago | 0
| accepted
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 ...
1 day ago | 0
Install a toolbox from command line?
I would probably use the silent installation process.
2 days ago | 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 (...
2 days ago | 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:...
2 days ago | 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...
2 days ago | 1
| accepted
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...
2 days ago | 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?...
3 days ago | 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 ...
3 days ago | 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...
5 days ago | 0
| accepted
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...
5 days ago | 1
| accepted
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...
5 days ago | 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...
6 days ago | 0
| accepted
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...
7 days ago | 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...
7 days ago | 0
| accepted
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 ...
7 days ago | 1
How to add black isolines for f(x,y) = -1, 0, 1
Use the contour or contour3 functions.
7 days ago | 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...
8 days ago | 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...
8 days ago | 1
| accepted
Extracting value from Name-Value pairs using the Name string
test = struct('units', {'degrees_east', 'degrees_north'}, ... 'long_name', {'longitude', 'latitude'}) theNames = {test.lon...
8 days ago | 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)
9 days ago | 0
| accepted
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...
12 days ago | 1
| accepted
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...
12 days ago | 0
| accepted
Histogram occurences per age problem
Use the histogram function instead of histc.
13 days ago | 1
| accepted
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...
13 days ago | 0
Passing additional argument into objconstr
Adapting the example from the documentation page for packfcn: ros = @(x, k) k*(x(2) - x(1)^2)^2 + (1 - x(1))^2; % Added a param...
14 days ago | 0
Use of Genetic Algorithm feature for optimization of technical design
What signature does the documentation page for the ga function state your nonlinear constraint function must have? [How many inp...
14 days ago | 1
Transpose pivot reshape a MATLAB table from a cross-section wide 'row format' to a panel-data long 'column' format
I'm not sure where those 4444 values came from in your second T variable, but I think what you want is to stack your table data....
14 days ago | 0
