Steven Lord

MathWorks

Last seen: Today | Aktiv seit 2002

Followers: 1 Following: 0

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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Matlab logic of plotting meshgrid formula
See this documentation page for a description of the difference between the * and .* operators (and similarly / and ./, etc.)

etwa 5 Stunden vor | 0

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Create a solid line instead of single points in the plot
Rather than plotting individual points inside a loop (as @VBBV and I both suspect you are doing) you could pull the plot command...

etwa 6 Stunden vor | 0

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Modifying the search path is not supported by Matlab Compiler?
See the "Do Not Rely on Changing Directory or Path to Control the Execution of MATLAB Files" section on this documentation page....

ein Tag vor | 0

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Incompatible Sizes for ode45 Output Assignment
Rather than plotting the orbit after the fact, why not use an OutputFcn to plot while the ODE solver is solving? The ballode and...

ein Tag vor | 0

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How can I write a set of first order ODEs with two variables?
In this case, the second input to your ODE function will have four elements. Using a slight variant (to avoid using y in two dif...

ein Tag vor | 1

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Create Class that is both Heterogeneous and a Handle class
I am looking to create a class that is both a handle class object which allows reference copies of that first object to be distr...

2 Tage vor | 0

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how to convert text file as it was written .m file to call functions?
If all the text in the file consists of valid MATLAB code and comments, just change the extension from .txt to .m.

2 Tage vor | 0

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datetime adjustment in x-axis plot
Stop using datenum. If you have the text form of a date and time, use datetime instead of creating a serial date number array. Y...

2 Tage vor | 1

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Why is it that Line objects can be instances of two different classes? How can I use findobj to detect only chart primitives?
Handle Graphics objects support the creation of heterogeneous arrays. So for example you can store a figure handle and an axes h...

2 Tage vor | 2

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How to sort table more than one variable with specified condition ?
See the "Sort Rows of Table by Variables" example on the documentation page for the sortrows function.

3 Tage vor | 0

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Can't get matrix to populate first column
The smallest value in z is 1. Because you add 1 to z to generate z1, that means the smallest value in z1 is 2. You use z1 to det...

4 Tage vor | 0

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description of highlighted code
From the variable names and the signature, this looks like a function you wrote or were given as part of solving a system of ODE...

5 Tage vor | 0

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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...

6 Tage vor | 0

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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...

6 Tage vor | 1

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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...

7 Tage vor | 0

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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);...

7 Tage vor | 0

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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...

7 Tage vor | 0

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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...

8 Tage vor | 1

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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...

9 Tage vor | 0

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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...

9 Tage vor | 0

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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...

9 Tage vor | 0

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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...

10 Tage vor | 0

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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...

10 Tage vor | 0

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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...

11 Tage vor | 0

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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...

11 Tage vor | 0

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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

14 Tage vor | 0

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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...

15 Tage vor | 0

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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...

15 Tage vor | 0

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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: %{ % ...

15 Tage vor | 0

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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...

16 Tage vor | 0

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