Steven Lord

Last seen: Today

MathWorks

5.418 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
why fprintf have a double class but sprintf have char
Because that's what they're documented to do. The documentation for the sprintf function states "str = sprintf(formatSpec,A1,.....

alrededor de 15 horas ago | 0

Answered
Different results for formula in Matlab and Excel
The problem is operator precedence. Here are the rules for operator precedence in Microsoft Excel and here are the rules for MAT...

alrededor de 18 horas ago | 2

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Answered
Error: Array indices must be positive integers or logical values.
-2*zeta2(z(4)-z(2)) Is z(4)-z(2) guaranteed to be a positive integer value suitable for use as an index into the variable zeta2...

alrededor de 18 horas ago | 0

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Answered
Call function in package from package
Everything I'm writing here is my own opinion about what would happen if we made the change requested in this discussion thread....

alrededor de 19 horas ago | 1

Answered
unclear number of if or maybe other commands?!
So you want to discretize your data? x = rand(10, 1); binedges = 0:0.25:1; values = [1.1, 2.22, 3.333, 4.4444]; d = discreti...

alrededor de 20 horas ago | 0

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Answered
how to create helperCropPointCloudsAndMergeLabels function?
Open the Live Script containing the example in MATLAB using the "Open Live Script" near the upper-right corner of the page in th...

alrededor de 21 horas ago | 1

Answered
The end operator must be used within an array index expression.
In this case read is a function, not a variable. Attempting to "index" into the function with end won't work. I would probably r...

alrededor de 21 horas ago | 2

Answered
Problem with adding integers
Set an error breakpoint and run your code. When you reach the line that throws the error, check that what you believe to be true...

alrededor de 21 horas ago | 0

Answered
scatter plot (need matlab script)
That doesn't look like a scatter plot. It looks more like a heatmap chart. Though you are going to need to bin your data if you ...

alrededor de 21 horas ago | 1

Answered
Create an array of empty durations
Another way to create an empty array of duration objects is to use the empty function for the class. d = duration.empty(5, 0)

alrededor de 21 horas ago | 1

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...

2 días ago | 0

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

2 días ago | 0

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Answered
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...

3 días ago | 0

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Answered
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...

3 días ago | 0

Answered
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...

3 días ago | 0

Answered
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...

3 días ago | 0

Answered
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...

3 días ago | 0

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Answered
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 ...

5 días ago | 0

Answered
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...

6 días ago | 1

Answered
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 ...

6 días ago | 0

Answered
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...

6 días ago | 0

Answered
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...

6 días ago | 0

Answered
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 ...

6 días ago | 0

Answered
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.

6 días ago | 0

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

6 días ago | 0

Answered
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...

7 días ago | 3

Answered
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...

7 días ago | 0

Answered
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 =...

8 días ago | 0

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

8 días 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...

9 días ago | 0

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