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
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...
23 minuter ago | 0
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...
en dag 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...
en dag ago | 0
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 ...
en dag ago | 1
How to add black isolines for f(x,y) = -1, 0, 1
Use the contour or contour3 functions.
en dag 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...
2 dagar 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...
2 dagar 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...
2 dagar 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)
3 dagar 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...
6 dagar 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...
6 dagar ago | 0
| accepted
Histogram occurences per age problem
Use the histogram function instead of histc.
7 dagar ago | 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...
7 dagar 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...
8 dagar 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...
8 dagar 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....
8 dagar ago | 0
How to determine polynomial coeffisient of N x M matrix instead Of 1 x N or N x 1?
Do you want M polynomials, one per row, or do you want one polynomial for all your data? If the latter, just columnize your data...
8 dagar ago | 0
| accepted
Is there a better way to use cellfun with arguments? and is it better than for-loop?
A = {1:10, magic(5), @sin} cellfun(@(x) size(x, 1), A)
8 dagar ago | 1
[beginner] How do you plot two vectors of diffrent length?
I believe your suspicion about whether the commas should be periods is correct. MATLAB uses the convention that the decimal sepa...
8 dagar ago | 0
How do I create array of a function with for loop?
I have a in total 42 of 424x412 doubles Can you do this? Yes. Should you do this? The general consensus is no. Rather than ha...
9 dagar ago | 1
Setting a plot's x-axis by units and not finer data points?
When you call plot with one data input, the indices of the elements in the vector are used as the X coordinates. plot((1:10).^2...
9 dagar ago | 0
Use of geoglobe in MATLAB R2017a
As stated on the documentation page for the geoglobe function, it was introduced in release R2020a. It did not exist in release ...
10 dagar ago | 0
I am trying to solve 3 simultaneous ODE's. Which method to use?
This documentation page includes two examples, the second of which you can use as a model for your code to solve a system of dif...
10 dagar ago | 1
creating variables with a for loop
Can you define variables with numbered names like X1, X2, X3, ... or whose names are given by a list of strings? Yes. Should y...
13 dagar ago | 0
Which toolboxes are recommended for civil engineering?
This question is really quite general and so it's difficult to give a definitive answer. If you open the Solutions page linked a...
13 dagar ago | 0
Efficient ODE with function handles
Does f_function expect to be called with two input arguments or three? x = [1; 2; 3]; y = [4; 5; 6]; value1 = min([x, y], 4) ...
13 dagar ago | 0
Converting hh:mm:ss into seconds
t='14:35:59.812'; F = 'hh:mm:ss.SSS'; du = duration(t, 'InputFormat', F, 'Format', F) format longg % To make s look nicer s ...
15 dagar ago | 0
How to average first two dimension of 3D array/matrix?
The ability to specify a vector of dimensions over which to sum an array was introduced in release R2018b as stated in the Relea...
15 dagar ago | 1
function whose arguments contains a function with possibly a variable number of outputs
See this documentation page, specifically the section on How to Use Comma-Separated Lists.
16 dagar ago | 0
| accepted
For inbuilt solvers ODE23/DDE23, how to keep saving/output all solution values intermediately (eg: every 1 hour, save/output the solution instead of only after reaching tf)
Specify an OutputFcn in your dde23 function. Have that OutputFcn log the data to a file.
16 dagar ago | 0
