# Steven Lord

### MathWorks

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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**Content Feed**

fail to convert datetime with pm string

s = '2022-09-30 16-01'; In the InputFormat option for the datetime function, 'hh' refers to "Hour, 12-hour clock notation using...

circa 17 ore ago | 0

| accepted

Create subclass but doesn't need 1 superclass property

Ignore the fact that the superclass has the property by not using it in any of the subclass methods. Split the superclass into ...

1 giorno ago | 0

Issue with moving from hist() to histogram(). Different values?

As stated on this documentation page the hist function operates with bin centers while histogram operates with bin edges. If you...

1 giorno ago | 0

X axis tick labels

The function for setting the X ticks on an axes is xticks not xtick. It is not a method of the axes object so you need to call i...

2 giorni ago | 0

Round to nearest ones place value ex ante

theRange = [3700 3705]; x = randi(theRange, 10, 1); closer = interp1(theRange, theRange, x, 'nearest'); Let's show the result...

2 giorni ago | 0

How to write a script to test central limit theory

Im pretty new to matlab and am unsure of how write a script that calls to my funtion. I have a function written but I am also un...

2 giorni ago | 0

Error when using str2func: "Invalid expression. Check for missing multiplication operator, missing [...]"

Let's look at the first part of your text. @(X,Y,var)8,var(65),var(57)0,var(57)1,var(57)2,var(57)3,var(57)4,var(57)5)(var(57)5....

2 giorni ago | 0

How to save workspace in stages while optimizing disk space

How are you loading your data? Are you calling load with an output argument or without? If you called load with an output argum...

2 giorni ago | 0

Using Matlab as a variable name

There is a package named matlab that some functionality in MATLAB uses (such as the unit testing framework matlab.unittest packa...

2 giorni ago | 1

| accepted

Add Text Subscript to Table string

You don't. The text in the table doesn't have any sort of formatter or interpreter associated with it; it's a collection of char...

3 giorni ago | 0

Problem with function handle array evaluation

Define two helper functions: apply = @(fun, x) arrayfun(fun, x, 'UniformOutput', false); stack = @(x) vertcat(x{:}); Now let'...

3 giorni ago | 0

| accepted

Error about preallocating for speed

Those lines of code don't error. When Code Analyzer analyzes your code it issues a warning about those lines indicating that the...

3 giorni ago | 0

i need help with the matlab assigment i have done all the part but i just need to store them in vector and display the user output number and all its divisors in a meaningful

sum = 0; You should use a different name for this variable, as sum already has a meaning in MATLAB. x = input ( 'please input ...

4 giorni ago | 0

I am not able to get the answer for the following code, I am using golden search section method.

You define a function named gss but you never call that function. Also, I would remove the first three lines of your code. clc...

4 giorni ago | 0

How make the number of columns of two matrices equal?

There are a number of possibilities. Off the top of my head: You could discard 1100 columns of the second matrix (the first 110...

4 giorni ago | 0

Unrecognized function or variable 'sum'.

It seems that matlab is trying to evaluate sum as a variable instead of a function. That is correct, because in the method it i...

4 giorni ago | 0

How do I solve a triple integral with one integral limit in function of another variable

See the "Integral over the Unit Sphere in Cartesian Coordinates" example on the integral3 documentation page for an example of h...

4 giorni ago | 1

GUI crashes when using eigs with a nonzero shift on a large generalised eigenvalue problem.

Please send the crash log file along with the code and data with which you can reproduce the crash to Technical Support directly...

4 giorni ago | 0

How to plot data point by point and erasing the last one?

Instead of creating two new scatter plots each step (one to cover the previous point in white, the other to create the new point...

5 giorni ago | 0

Rounding towards zero or from zero

The tiebreaker methods only apply when the quantity to be rounded is halfway between the two numbers to which it could be rounde...

5 giorni ago | 0

How do I pick a number from a set of random numbers?

Since I suspect this is part of a homework assignment I'm not going to give you the answer, but I will point you toward two func...

6 giorni ago | 0

Efficient way to solve an equation in MATLAB

Solve numerically using fzero. Here I've written a function handle that itself makes function handles. I can pass that generated...

6 giorni ago | 1

| accepted

How to find parent uifigure for a child several layers down

Use ancestor. >> f = uifigure; >> h = uipanel('parent', f); >> f2 = ancestor(h, 'matlab.ui.Figure'); >> f == f2 ans = ...

8 giorni ago | 1

| accepted

if and sum not working together

Please try this little experiment. Find something to write with and something to write on (ideally compatible things; pencil and...

8 giorni ago | 1

Would like a script that removes repeat data

Dates_Wrong = ['2/4/21';'2/5/21';'2/5/21';'2/6/21';'2/7/21'] dt = datetime(Dates_Wrong, 'InputFormat', 'M/d/yy') differences =...

8 giorni ago | 0

| accepted

Equality between 2 floats not recognized when using <= relational operator

I searched it up and apparenty it's to do with matlab not storing floats very accurately, No, that is not the cause. Are the n...

9 giorni ago | 1

divide year time data into days and nights

I'm going to use the sunrise and sunset times for Natick, MA for this example. I'll create some random datetime values for the n...

9 giorni ago | 2

APP Designer code convert to CPP code

If upgrading to a release (R2020a or later) that includes Simulink Compiler is an option, you might find the workflow on this do...

9 giorni ago | 0

How to obtain the piecewise expressions of spline fit obtained using MATLAB's command spapi?

i want to obtain the expression and calculate it derivatives further. Do you need the actual expression, or do you just want to...

9 giorni ago | 1

Add code to have switch repeat if a case is not met

You can simplify your switch call so you don't have to include 2^(number of letters) cases each with a different combination of ...

10 giorni ago | 0