Community Profile # Steven Lord

### MathWorks

4,889 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

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Creating M histograms from an NxM table on separate plots
A = 2*randn(1e4, 6) + 5*(0:5); T = array2table(A); for k = 1:width(T) subplot(2, 3, k) histogram(T{:, k}) end Note...

4 hours ago | 1

Operands on table, comparison with numbers
say I fix one of the row indices " ind" .If I try say find(A(ind,:)>0.1) I get the error : "Operation '>' not supported for oper...

9 hours ago | 0

How to extract rows based on column values in a matrix?
This wasn't an option when the question was asked originally but depending what you're trying to do with those "3 matrices", usi...

9 hours ago | 0

Matlab 2020b does not find Xcode Mac OS Big Sur
I would try following the instruction in the warning message. Run Xcode (outside of MATLAB) and when it prompts you to accept th...

9 hours ago | 0

Create new column in table based on another column value
Let's start with a sample table. T = table([123; 345; 234], [9; 1; 3], 'VariableNames', ["ID", "Occurrences"]) Fill in the Uni...

18 hours ago | 0

Sorting time in 1 hour time slots.
minutesPerDay = minutes(days(1)); m = minutes(randi(minutesPerDay, 100, 1)); n = datetime('now'); t = n + m; h = histogram(t...

1 day ago | 0

Generalized Eigenvalue Problem - Hessenberg Matrix
It sounds like you might want to use the syntax of eigs whose first input is Afun, a function handle that returns the result of ...

2 days ago | 0

Error using inputdlg: dialogs disabled
Line 2 of the inputdlg function included in MATLAB is a comment describing the function. Therefore you have written or downloade...

2 days ago | 0

Creating a symbolic array
If you want an array of q's: syms q A = repmat(q, [5 5])

2 days ago | 0

Installing matlab 2019 on windows
Searching using Google for "exec error 22" found this MATLAB Answers post that appears to be relevant.

2 days ago | 0

I can't create a graph from the adjacency matrix
I suspect you've created a digraph object and stored it in a variable named graph, which will prevent you from calling the graph...

2 days ago | 0

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How to find minimum value ,correspondings to a column ,in an output ?
The second output from the min function will help you retrieve the corresponding element of x.

2 days ago | 0

tan verses tand error in loop
phi_o(i) = (atand((0.5*g*t(i).^2*((1/3)*(2*sqrt(Vx(i)/Vx_o)+1)))/x(i))); ...

3 days ago | 0

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How to get a function from user without knowing its symbols
The symvar and str2sym functions listed (along with many others) on this documentation page may be of interest to you.

3 days ago | 0

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how do I right x^2 in MATLAB
To raise a square matrix to a power use the ^ operator. To raise each element of an array (the array need not be square or even...

3 days ago | 0

Why is line visible while its parent axes is unvisible?
Because the line has its own Visible property and that property's value is 'on'. fig = figure; ax = axes(fig, 'Visible', 'on')...

3 days ago | 0

How can I create bins in Matlab using predefined counts?
histogram('BinEdges', [2, 4, 6, 8], 'BinCounts', [20, 5, 13]);

4 days ago | 0

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Function keeps getting errors, how to fix?
What is the full and exact text (everything displayed in red and/or orange in the Command Window) of the error and/or warning me...

4 days ago | 1

How can I get the solve function to display values instead of solutions containing other variables?
syms d D N_a D_od = 1.9; %outer diameter of coil C = 7; eqn1 = (D_od-d)/d == C; solve(eqn1,d) This second line of code solv...

4 days ago | 0

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I am not able to use the function minibatchqueue. I get the error as "Unrecognized function or variable 'minibatchqueue'."
According to the documentation page this function was introduced in Deep Learning Toolbox in release R2020a. Do you have this to...

4 days ago | 0

2016b installtion problem
What happened when you tried pressing Yes? If that still did not work, you may want to try restarting the installer in case tha...

4 days ago | 0

How and when can future versions of the custom deep learning layer improve flexibility?
If you wish to request that the custom deep learning layer functionality be enhanced with specific functionality (like the abili...

4 days ago | 0

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Arg max of a function
The operator + does not and cannot return two output arguments. Nor can its functional form, plus. As a hint, take a look at th...

5 days ago | 1

Creating a Matrix of random numbers
possibleValues = [-1, 1]; desiredSize = [5 6]; A = possibleValues(randi(numel(possibleValues), desiredSize)) This assumes you...

5 days ago | 2

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My polyfit function is displaying NaN
There are at least three potential difficulties with your code. The first difficulty is that you're passing log10 of the Displac...

5 days ago | 0

Draw a heptagone of dice vertices. MATLAB.
polyshape, patch, or plot are three possibilities depending on what you want to do later on with the polygon.

6 days ago | 0

How do I throw an error from TimerFcn?
The TimerFcn is running at the same time as MATLAB is executing the try / catch block but it's not executing "inside" the try / ...

6 days ago | 0

I'm keep having an error 'Not enough input arguments' for this code
Others have commented on the fact that you need to call your function with an input argument. I want to point out a different pr...

6 days ago | 0