Steven Lord
Last seen: Today
MathWorks
4.762 total contributions since 2002I 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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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
table2timetable adding time vector with start- and end date
The times for a timetable can be either a datetime array or a duration array. Turn your data into a duration array and use it to...
circa 8 ore ago | 0
char to double data type
I recommend turning the character data representing dates into a datetime array and using that datetime array along with your do...
circa 14 ore ago | 0
Can I store a function including multiple variable?
You can't call a function handle using :. If you want the anonymous function to "remember" and use the values of x and t that yo...
3 giorni ago | 0
Hi, I want a solution regarding below error.
Google found only one hit for mk_egs_string. It was this question. So this is not a MathWorks function, nor is it a function on ...
4 giorni ago | 0
I have matrix A, calculate null(A) but then A*null(A) doesn't give me 0?
Note that the description of the output argument on the documentation page for the null function does not include the character ...
4 giorni ago | 0
Is there such a table units identification approach?
Let's make a sample table and give it some units: >> load patients >> patients = table(LastName,Gender,Age); >> patients.Prop...
4 giorni ago | 0
| accepted
How to find what settings "tsne" is using when I do not specify any Name Value pairs as options?
Open the documentation page for tsne using the doc command. Scroll down to the Name-Value Pair Arguments subsection of the Input...
4 giorni ago | 0
| accepted
Why matlab live editor and matlab script gives different rank calculation result for the same matrix ?
The value MATLAB displays is sometimes not the value MATLAB uses in computations. >> format short >> x = 1 + 1e-8 x = 1....
4 giorni ago | 1
MATLAB CODE COVID-19
This is not at all what I'd call a trivial task, given the number of papers and stories on the MathWorks COVID-19 R&D page. At a...
5 giorni ago | 0
Help me read the doc on matlab.fonts Settings
What is the purpose of TemporaryValue ? The name itself indicates that its value will only be used for a limited time. Setting ...
5 giorni ago | 0
| accepted
Loading C files in matlab with mex
I'm not familiar with that package but I'm curious if the ilu function in MATLAB would be suitable for your needs?
5 giorni ago | 0
How to change variable in base workspace without blocking the thread?
Are you using the Simulink Support Package for Arduino Hardware? I have not used this myself but I would be surprised if it didn...
5 giorni ago | 0
What products are Recommended?
In addition to what the other posters suggested, take a look at the Solutions page on the website. This lists various industries...
5 giorni ago | 1
Complex number to polar form
Use pol2cart and cart2pol to convert between the (r, theta) and (real, imag) representations of the complex numbers. Since I'm g...
5 giorni ago | 0
pitch function equation for documentation
Do the Algorithms and References sections on the documentation page for the pitch function not provide the information you want ...
5 giorni ago | 0
Stuck on question 2.
Under the constraints that you have to use nested for loops and that this only has to work for matrices, not N-dimensional array...
5 giorni ago | 0
| accepted
How can I select the working dimension by supplying the DIM argument?
In the Extended Capabilities section of the documentation page for the max function, expand the "C/C++ Code Generation" item. Th...
6 giorni ago | 0
how can i calculate a complex polygon with coordinates in matlab ?
If you want to do more than just compute its area I would use polyshape for that. >> x = [7 7 5 3 -5 0 -8 2 -4]; >> y = [-7 3 ...
6 giorni ago | 0
What kind of blocks are these?
Based on context I think they are To Workspace blocks.
6 giorni ago | 0
| accepted
Ideas for a better way to present my data
I agree with Rik's suggestion. I think a heatmap might work well, as might a bar3 plot. But a broader suggestion I have is to t...
6 giorni ago | 0
| accepted
Non Compatible Indices, Combining array sections
You can't put multiple numbers into one element of a numeric array. x = 1:10; x(5) = ... % assigning to one element of x ...
6 giorni ago | 0
| accepted
please help to solve the issue below, I couldn't replace the Matrix A with matrix b. For example, Matrix A is 4x4 and Matrix b is 4x1. What can I do?
A and b are not inputs to your function. Only n is. If you want A and b to be inputs, define your function to accept them as inp...
7 giorni ago | 0
Previous versions of Symbolic Math Toolbox
Running release X of a toolbox with release Y of MATLAB (where X is not the same as Y) is not supported. Unless you're using fu...
7 giorni ago | 0
| accepted
How can I plot this anonymous function?
(x^.2) You probably don't want to use the matrix power operator ^ to raise the square matrix x to the 0.2 power here. You prob...
7 giorni ago | 0
| accepted
Global variable definition change in 2020a
My suspicion is that you're not actually using global variables, you're using variables shared between a function and another fu...
9 giorni ago | 0
| accepted
ode45 failing but other solvers work fine
Rename this file from ode45.m (which prevents you from calling the ode45 function included in MATLAB) to firstorderRK45.m. Don't...
9 giorni ago | 0
Runtime error in compiled standalone
"Creation of symbolic expressions, such as using sym, syms, and str2sym" in a standalone application created with MATLAB Compile...
9 giorni ago | 0
| accepted
Matlab Invalid Data Argument
Let's look at your code section by section. u = @(t) (t>=0); r = @(t) t.*u; This will not work as written. You cannot multipl...
9 giorni ago | 0
How to get == to help solving equations
My guess would be that you had redefined y between the syms call and when you tried to use it as a symbolic variable. syms y f...
9 giorni ago | 0
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