Steven Lord
MathWorks
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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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dictionary() question: "Error: Output argument not assigned a value in the execution with 'x' function" - works with some inputs and not others even though code is identical.
What value is assigned to the output argument variable numout if the value in the input argument variable convtype doesn't match...
alrededor de 10 horas hace | 0
Vector norms not interacting with dlarrays as documented
According to the Release Notes, support for dlarrays in vecnorm was added in release R2023b.
alrededor de 10 horas hace | 0
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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.)
alrededor de 21 horas hace | 0
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...
alrededor de 23 horas hace | 0
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....
1 día hace | 0
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...
2 días hace | 0
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...
2 días hace | 1
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...
3 días hace | 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.
3 días hace | 0
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...
3 días hace | 1
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...
3 días hace | 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.
4 días hace | 0
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...
5 días hace | 0
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...
6 días hace | 0
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...
7 días hace | 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...
7 días hace | 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 días hace | 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);...
8 días hace | 0
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...
8 días hace | 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...
9 días hace | 1
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...
10 días hace | 0
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...
10 días hace | 0
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...
10 días hace | 0
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...
11 días hace | 0
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...
11 días hace | 0
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...
12 días hace | 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...
12 días hace | 0
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 días hace | 0
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...
16 días hace | 0
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...
16 días hace | 0