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Steven Lord

MathWorks

Last seen: Today |  Active since 2002

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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
Possible to iterate over table rows without a loop index variable?
To perform an operation on all rows of a table array you could use rowfun, but that isn't the same as writing a general for loop...

ungefär 6 timmar ago | 0

Answered
pcregistericp using GPU Support
Note that "GPU Code Generation" and "GPU Arrays" are two different Extended Capabilities. For example, in MATLAB there are 200 f...

ungefär 7 timmar ago | 1

| accepted

Answered
ode45 invalid parameter 981/100
When you call odeFunction with g as part of the third input, it is not a symbolic variable. You originally defined it using syms...

ungefär 19 timmar ago | 0

| accepted

Answered
I need to Fix an Error For Lines 34 & 126
Let's look at your cal_obj function. function z = cal_obj(A,B,MB) n = length(MB); z = 0; for i = 1:n z = z + B(MB(i))*A(i);...

en dag ago | 0

Answered
I get an error using fsolve but I don't understand why?
Look at the description of the fun input argument on the documentation page for the fsolve function. The relevant part of that d...

en dag ago | 0

| accepted

Answered
Problem with solve() and "Empty sym: 0-by-1".
Let's look at the systems of equations you're trying to solve. Ax = [0 1 0 0; 0 -0.1 0 0.8; 0 0 -4 9; -1 -9 2 -8]; Bx = [0 0 0...

2 dagar ago | 1

Answered
Error using fclose in MATLAB on Mac: "Invalid file identifier. Use fopen to generate a valid file identifier.
When you call fopen you should call it with two output arguments and check if the first is -1. If it is, that means MATLAB and/o...

3 dagar ago | 0

Answered
how do I get my license number?
See this Answers post for instructions on how to determine your license number either from within MATLAB or without having MATLA...

3 dagar ago | 0

Answered
I have a code in python and want to convert it in matlab format
Do you need to convert the code or would being able to run the code in MATLAB be sufficient? If the latter, see the documentatio...

3 dagar ago | 0

Answered
How to Get one Property of a Structure Array Using a Property on the Same Line
You could do what you described by making a non-scalar struct, each element of which has three fields, each of which has a piece...

4 dagar ago | 0

Answered
How to extract numerator and denominator coeficients from polynomial function to array
Do you have separate symbolic expressions for the numerator and denominator or do you have the fraction created by dividing nume...

4 dagar ago | 0

Answered
Error in matlab.internal.doc.csh.DocPageTopicMap/parseTopicPath
Likely you've written your own split.m function that takes precedence over the split function included in MATLAB. What does this...

5 dagar ago | 0

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Answered
Trouble labeling x and y axis
Do you have a variable named xlabel in the workspace? If you do, you cannot call the xlabel function. Clear or rename the variab...

5 dagar ago | 0

Answered
Maximum recursion limit is reached when I try to open any script
Did you create an open.m file that tries to call open? What does this command show? which -all open

8 dagar ago | 0

Answered
convert a range vector of bin centers to bin edges. Bin Centers and edges are non-uniform
If you know one of the edges of the region you're trying to bin, either the left-most or right-most edge, you can do this. Let's...

9 dagar ago | 0

Answered
How to Fix "Warning: Colon operands must be real scalars" Warning
If you have a small case with which you can reproduce this behavior, could you please send it to Technical Support directly usin...

9 dagar ago | 0

Answered
How to open a directory in Matlab ? Like how do I make the code open a directory ?
I've copied and pasted your code commented out into this message so I can run some sections of code I wrote. This line: %{ % ...

9 dagar ago | 0

Answered
Optimization toolbox installed, but MATLAB says it has been removed
The Optimization Tool interface (optimtool) was removed in release R2021a. The Optimization Toolbox has not been removed. Inste...

10 dagar ago | 0

Answered
how to multiply every single element in a matrix to entire of another matrix?
If you're asking can you dynamically create variables with numbered names like x1, x2, x3, etc.? Yes. Should you do this? The g...

12 dagar ago | 2

Answered
is there a way to make the 0 x and y axis bold?
If you wanted to highlight the X and Y axes by making them cross at the origin, set the XAxisLocation and YAxisLocation properti...

12 dagar ago | 0

Answered
Wrong suming output in simulink r2023A
I don't work with Simulink that much, but I'd check the data types of the various signals in your code. 106 - (-150) The fact ...

12 dagar ago | 0

Answered
Subtracting a Vector from a Scalar-Multiplied Matrix
See this documentation page.

14 dagar ago | 1

| accepted

Answered
Unrecognized method, property, or field 'updateGraph' for class 'app1'.
Your updateGraph function is nested inside your UIAxesButtonDown method. So it's not a method of the class. Move the updateGrap...

15 dagar ago | 0

Answered
Number of counts in matrix
Use histcounts with unique (or uniquetol) to generate the bins. You will need to add one more bin at the end since the last bin ...

15 dagar ago | 0

Answered
Download of addons & update are blocked by company firewall
I am not 100% certain but I believe Add-Ons Manager and the Update installer need to connect to the same servers as the MathWork...

16 dagar ago | 0

Answered
Parse error at x
If all of the code you posted is in the same file, the line where you define the initial value occurs after the end keyword that...

17 dagar ago | 1

Answered
Generate 3D histogram while capping the height of bars
Rather than trying to make hist3 or histogram2 truncate the bins, consider using zlim to control the limits of the Z axis. x = ...

17 dagar ago | 0

Answered
Drawing polygons from vertex coordinates
See the polyshape function. If you're hoping MATLAB will automatically "figure out" what the polygons should be from your scatt...

17 dagar ago | 1

Answered
I can't run a file
Most often I'd expect to see this if you tried to include either a space in the name of your MATLAB program file (not allowed) o...

18 dagar ago | 1

| accepted

Answered
Telling numbers and letters apart
You can use the isstrprop function to determine which characters inside a string are letters. S = ["D56788T5434" "E44G5555" "...

18 dagar ago | 0

| accepted

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