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Steven Lord


MathWorks

3.564 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
Graph visualization adding white to my nodes. How to solve it?
Can you check if there's an update available for your graphics driver? If not, did this behavior suddenly start appearing (afte...

alrededor de 8 horas ago | 0

Answered
fplot command makes plot white
Those ought to throw an error. You can't multiply a function handle and a number. You can multiple the result you receive from e...

alrededor de 8 horas ago | 0

Answered
Why is help() malfunctioning
The output you posted for help doc doesn't match the help text I see when I run that command. Did you post exactly what you see ...

alrededor de 11 horas ago | 0

Answered
How to develop a number selector using matlab app designer?
Do you need individual buttons for each digit, or would a uispinner or uidropdown that allows you to select a number between 0 a...

alrededor de 11 horas ago | 0

Answered
Error: Unbalanced or unexpected parenthesis or bracket
DON'T USE eval unless you absolutely need to. [There are very, very few circumstances where you absolutely need to.] But let's ...

alrededor de 12 horas ago | 0

Answered
Run scripts with a script
genpath is a big hammer. Are you certain you actually need to use it? Looking at the message you received: Warning: Name is no...

alrededor de 12 horas ago | 0

Answered
Write a loop that sums and subtracts elements with a lower and upper limit?
Do you want to stop the loop entirely or do you want to saturate and continue on with the next iteration starting from the satur...

alrededor de 16 horas ago | 0

Answered
How to draw lines in matlab figure
You could either turn the grid on or use the xline and/or yline functions. plot(1:10); grid on xline(4.5, 'r:') yline(2*pi, ...

alrededor de 16 horas ago | 0

Answered
Sub function error within main function
In general, when you're asking for help with an error you should show the full and exact text of the error message you receive. ...

1 día ago | 0

Answered
running time problem in matlab
Take a look at groupsummary.

4 días ago | 0

Answered
Mathworks .m files license condition
I will repeat what I said in my response to a similar question from Jakub Tomek: "For questions about the license agreement you...

4 días ago | 0

| accepted

Answered
How to pass a method as a function handle
Are my_method and my_other_method Static or non-Static methods of the class of the value stored in the my_obj_with_methods prope...

4 días ago | 0

Answered
How to filling a blank matrix with designated patterns using a single for loop?
reshape your vector into a matrix of the appropriate size then flip the matrix. No for loop required. If you're required (by a ...

4 días ago | 0

| accepted

Answered
Index in position 1 is invalid. Array indices must be positive integers or logical values.
So when I calculate the index, it is 1.7290e+03. Calling "index" in the code throws an error, but copying and pasting "1.729e+03...

5 días ago | 0

| accepted

Answered
sinc(pi) doesn't give zero
The pi function does not return but a value very close to as Jeremy Marcyoniak stated. Using a tolerance or rounding are two a...

5 días ago | 0

Answered
for loop indexing per allocating
As KALYAN ACHARJYA stated you're not allowed to use either 0 or a non-integer value as an index into a numeric array in MATLAB. ...

5 días ago | 2

Answered
Traveling Salesman Problem: change border
So you want to try Cleve's or Loren's approaches for solving the TSP? Just substitute your own graph object reflecting which reg...

6 días ago | 0

Answered
Creating values to a matrix with "if" statement
When you call if with a non-scalar expression as its condition, " An expression is true when its result is nonempty and contains...

6 días ago | 0

Answered
Help Implementing Pseudo Code
Since this sounds like it may be homework I'm only going to give two hints. One way to do step 1 is to use discretize. You may...

6 días ago | 1

| accepted

Answered
The logical indices contain a true value outside of the array bounds
I recommend setting an error breakpoint and running your code again. When the code throws the error and stops at the breakpoint,...

6 días ago | 0

Answered
Two equal datetime values showing as unequal when compared?
One thing you can do is check if they're "close enough": s = datetime(2017,3,24,9,5,0.1); t = datetime(2017,3,24,9,5,0.2); ...

6 días ago | 0

| accepted

Answered
Legality of modifying built-in functions
For questions about the license agreement you should contact Customer Service using the telephone icon in the upper-right corner...

6 días ago | 0

| accepted

Answered
Undefined function 'month' for input arguments of type 'double'.
The month function is only defined for certain data types in MATLAB. It can be used to extract the month number from a datetime ...

6 días ago | 0

| accepted

Answered
Symbolic solve/linsolve GUI Compiler - ERROR
Symbolic Math Toolbox is not eligible for use with MATLAB Compiler. Use matlabFunction to generate one or two function files tha...

6 días ago | 0

Answered
How change the colormap on heatmap??
Change the Colormap property of the heatmap, either when you construct the heatmap: h = heatmap(magic(5), 'Colormap', copper);...

6 días ago | 0

Answered
Cannot zoom into figures
Flavv, The name view already has a meaning in MATLAB. The zoom function (which is called when you use the zoom button in the Fi...

7 días ago | 0

Answered
return many value in function.
k1_1= sum(data{1:10,{'Var1'}})/10 k1_2= sum(data{1:10,{'Var2'}})/10 k1_3= sum(data{1:10,{'Var3'}})/10 k1_4= sum(data{1:10,{'V...

7 días ago | 2

Answered
how can i sum
Are the -1 values just indicators that there is data missing? If so, I'd replace them with NaN values and call sum with the 'omi...

7 días ago | 0

Answered
Is the 2007b release of MATLAB fully supported software?
Please send this question to Customer Service using the telephone icon in the upper-right corner of this page for an official an...

7 días ago | 0

Answered
MATLAB syntax (parantheses without intermediate steps)
That intermediate step isn't necessary in this case, since you're using a release that supports the 'all' dimension input argume...

7 días ago | 0

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