Steven Lord

Last seen: Today

MathWorks

5 408 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
Error using round every time can anyone please help me with this?
The round function for symbolic expressions does not accept the input argument N (the number of digits to which to round) like t...

ungefär 14 timmar ago | 0

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Rounding off and approximation functions.
N = 14; x = 2.^nextpow2(N)

ungefär 15 timmar ago | 0

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Does a site license work when offline; if so, how long before it needs to be refreshed?
One option would be to check with your IT department (or whomever maintains your licenses) to see if license borrowing is enable...

en dag ago | 0

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How to I know this file? It is a .p file.
Constantino Carlos Reyes-Aldasoro is correct. If you want to see the implementation of a P-coded file you will need to ask the a...

en dag ago | 0

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Why linsolve cannot solve this very simple equation?
The vector [6; 7; 11] is a solution to the problem but it is not the only solution. A = [4,2,2; 5,1,3; 6,0,4]; B = [60; 70; 80...

en dag ago | 0

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Help needed in some qutions about normalize histogran functions(in Q3 bulding like "plot (X'Y)
Read through the documentation page for the histogram function to see if it has any options and/or properties that will be of us...

en dag ago | 0

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Solve system of higher ODEs
Apply the techniques shown on this documentation page to turn your system of higher order ODEs into a larger system of first ord...

en dag ago | 0

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How would I perform logical comparisons with times given in the form of a string vector?
% time = datenum(temptime); Instead of converting the dates and times to serial date numbers, I recommend converting them to a ...

4 dagar ago | 0

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actxcontrol and actxserver: Future support plans?
1. Is there an announced time-frame for removing the actxcontrol( ) command? If you're looking for something more concrete than...

4 dagar ago | 1

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Error being printed "Error using sym>convertChar (line 1557) Character vectors and strings in the first argument can only specify a variable or number. To evaluate character vectors and strings representing symbolic expressions, use 'str2sym'."
You could use str2sym as the error message suggested, but instead I would use one of the approaches shown on this documentation ...

5 dagar ago | 0

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Split Table data based on Day Names
Do you want to have seven individual variables or do you want to operate on the set of rows in your table data where each row in...

5 dagar ago | 0

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How can I fix the problem of deep network designer in MATLAB?
Which release of Deep Learning Toolbox are you using? If you're using a release prior to R2019a I suspect though I'm not certain...

5 dagar ago | 0

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Passing structs/objects to functions
Just because MATLAB passes a large array into a function doesn't mean it needs to make a copy of that array if you don't modify ...

5 dagar ago | 0

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Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses.
for 1=1:n, The number 1 is not a valid variable name in MATLAB and so cannot be used as the loop variable in a for loop.

5 dagar ago | 0

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How to open Matlab with specific scripts in my editor?
Consider setting up different Projects for your different projects.

5 dagar ago | 0

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How to replace specific values to all values of a bin ?
Specify the values input argument in your discretize call. x = 6*rand(10, 1); d = discretize(x, 0:2:6, [1.6, 3.8, 5.7]); resu...

5 dagar ago | 3

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Nested structs and objects - do or don't?
Off the top of my head I'd probably use a three tier approach, something along the lines of the following untested code: classd...

6 dagar ago | 0

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resampling to avoid limit - nchoosek
Assuming VID1 has 429 elements and Hcombos has 36 rows, that means you're trying to generate one of this many combinations: N =...

7 dagar ago | 0

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how to define a variable with dates
Adapt the example on this documentation page. It won't require a lot of modification.

7 dagar ago | 0

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Answered
Feature Matching in MATLAB
Break each of those steps into sub-steps. Repeat step 1 until you've broken each step into sub-steps that you are able to imple...

7 dagar ago | 0

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Answered
Hi, I want to write a code that locates the nth value of matrix x= [2,4,6,8,10,12,14,16,18,20] where n is [1:10]. How could I write that?
That's basic linear indexing. See the "Indexing with a Single Index" section on this documentation page for more information. x...

8 dagar ago | 0

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Inconsistency of angle function in finding angle of vectors
Typing the command angle(1+i) yields an angle of 45 degrees, No it doesn't. It returns the equivalent angle in radians, however...

8 dagar ago | 0

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Comparative Operator result is wrong
Two numbers that are displayed the same may not represent the same stored value. See this Answers post for more information abou...

9 dagar ago | 0

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How to clear a TestCase class from memory?
You may find this new feature introduced in release R2021a useful.

11 dagar ago | 1

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How to get mean of all variables in a table?
The varfun function requires one of its inputs to be a table or timetable array (or a tall table or timetable.) which -all varf...

12 dagar ago | 1

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Graphplot nodes How to ensure generating only existing nodes.
S=[1 30]; T=[2, 1]; D1 = digraph(S, T) % use S and T as node numbers, 30 nodes plot(D1) D2 = digraph(string(S), string(T))...

12 dagar ago | 0

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Error using inlineeval (line 14)
Do not use inline. We first marked it "not recommended" somewhere between 15 and 20 years ago if I recall correctly. Just opera...

13 dagar ago | 1

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Answered
"Array indicies must be positive integers" error
The first element / row / column / etc. of an array in MATLAB is element / row / column / etc. 1. There is no element / row / c...

13 dagar ago | 0

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Why I can't use keywords "AutoFitWidth" for writematrix() in MATLAB R2020a?
That functionality was added in release R2020b.

13 dagar ago | 0

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How can I fix this error?
Where in your code do you define a variable named i? If the answer is some form of "nowhere" or "I don't" then MATLAB will call ...

13 dagar ago | 0