Steven Lord

Last seen: Today

MathWorks

5.071 total contributions since 2002

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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Answered
bisector method help and inputs
You haven't showed the code for your APFunction, so all we can say is that you're calling it with five input arguments and it mu...

circa 8 ore ago | 0

Answered
Using obj within function without passing it
The online documentation indicates I do not need to pass obj to the function to use it within That is incorrect. See the "Metho...

circa 19 ore ago | 0

Answered
How to solve this issue :Error: File: FormatDataNew.m Line: 1 Column: 59 Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parenthese
See my answer on this question.

circa 22 ore ago | 0

Answered
What does fzero take as input for the function?
then what does the function findmode take as input x? fzero will call your findmode function repeatedly with various values as ...

1 giorno ago | 1

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Answered
Handling Big Data in MatLab
Some of the tools and techniques described in the Large Files and Big Data category in the documentation may be of interest to y...

1 giorno ago | 0

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Finding the trajectory of a ball
Do not call ode45 with fball as the ODE function from within fball itself! That way lies (at best) a recursion error. Call ode45...

2 giorni ago | 0

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Answered
Error using tiledlayout syntax instead of subplot when referencing axes handles
Be very careful about using gca, gcf, etc. in your code. I generally only use those when I'm experimenting in the Command Window...

2 giorni ago | 0

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Answered
What value is 1.0000e-03 in normal numbers?
format longg x = 1.0000e-03

2 giorni ago | 0

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How to convert a 'char' into 'double' data type without disrupting the data?
You could try adding back in the '0' that you subtracted to create DoubleC from C, but keep in mind that not all the values in I...

2 giorni ago | 0

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Finding the position of specific value in a vector without knowing the exact number
Depending on how you're storing your data and what analysis / manipulation you want to perform on it, storing it in a timetable ...

2 giorni ago | 0

Answered
Remove time from datetime
Use timeofday to create a duration array containing the time since midnight for each of the datetime arrays. rightNow = datetim...

2 giorni ago | 0

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Answered
How to solve preallocating speed of a variable?
You start off with car an empty double array, then change it to a struct array with your first assignment in the loop. Instead I...

2 giorni ago | 1

Answered
How do I change the default background color of view(biograph) objects created in MATLAB?
I don't believe you can do what you ask. If you're not required to use the biograph object consider using a graph or digraph ob...

3 giorni ago | 1

Answered
Invalid use of operator.
int = sqrt(@(t).* (av(t))^2); That is not valid. You're not multiplying the square of av(t) by anything. int = sqrt(@(t) (av(t...

3 giorni ago | 0

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Answered
What is the default MathWorks recommended compiler for mex compiling C++ source files that require Intel MKL as linear algebra package?
See the page linked in the appropriate row of the "Supported Compilers" column of the table on the system requirements page. Tha...

4 giorni ago | 0

Answered
How to locate and link with the exact same Intel MKL that MATLAB is shipped with?
See this documentation page.

4 giorni ago | 0

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hypercube or hyperpca not found. Not even in R2020b .why ?
Both those functions are part of Image Processing Toolbox. Check the output of the ver function to determine if you have this to...

4 giorni ago | 0

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Object properties that automatically update but aren't Depenent
function obj = set.P(obj,pressure) if ~isempty(obj.P) error('Pressure is already set, please change pressure via s...

4 giorni ago | 0

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Answered
How do I convert a date time format that's (dd-MMM-yyyy hh:mm:ss) to (dd-MMM-yyyy hh)?
Do you want to change the displayed value or the stored value? dt = datetime('now') dt_display = dt; % Make a copy so dt can b...

4 giorni ago | 0

Answered
matlab 2021-a
In "the March timeframe". We don't give the specific release date ahead of time.

4 giorni ago | 0

Answered
ode45 error: must return a column vector
When you call your function at the initial time and conditions you pass into ode45 does it return a column vector? [I commented ...

4 giorni ago | 0

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Answered
The Simpson's 1-3 (h / 3) method in Matlab
% Ask for user input % Lower bound (a) a = input('What is your lower bound (a)?') % Upper bound (b) b = input('What is your ...

4 giorni ago | 0

Answered
Store a vector in one function and access it from another function in Appdesigner.
See this documentation page.

5 giorni ago | 0

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Answered
Dos command doesn't work through Matlab, and works OK in command window
You cannot use double quotes both to surround the command and inside the command, at least not that way. Something like this wou...

5 giorni ago | 0

Answered
Hello, can you help me with drawing up such a scheme, what source data is needed and in what form and how to enter them into the program (Matlab Simulink)?
Section 5 of the paper to which you linked seems to explain the meanings of most if not all of the identifiers given in that Sim...

6 giorni ago | 0

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Answered
Error using atan2 Inputs must be real.
Set an error breakpoint and run your code. When MATLAB stops on that line, look at the values you're passing into atan2 in the c...

6 giorni ago | 0

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Quotes matlab please help
What layout is your keyboard setup? On my 104 key US-QWERTY the single quote character used to create a char vector is immediate...

6 giorni ago | 0

Answered
Do anyone know how to graph your function in the interval from x=0 to inf
The fplot function allows you to specify the range of x over which you want your function to be plotted. syms x fplot(sin(x), ...

7 giorni ago | 0

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Answered
Solution to time and space dependent ODE
See the ode45 function and the example on its documentation page that discusses passing additional parameters into your ODE func...

7 giorni ago | 0

Answered
-If else- conditionals in matlab app.designer?
Compare: 'ac' == 'ad' % returns a 1-by-2 logical array 'ac' == "ad" % returns a 1-by-1 logical array When you compare two cha...

7 giorni ago | 1

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