# 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**

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...

environ 2 heures 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...

environ 4 heures 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...

environ 21 heures 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...

1 jour 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 = ...

3 jours 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...

3 jours 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 =...

3 jours 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...

4 jours 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...

4 jours 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...

4 jours 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...

5 jours 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 ...

5 jours ago | 0

How can I drawing equipotential lines?

Take a look at the contour function.

5 jours ago | 0

installing two MATLAB versions at same time.

It is possible to have multiple versions of MATLAB installed on the same machine at the same time. Just don't install them both ...

5 jours ago | 0

I need to understand what's the mistake and how to define vector

When MATLAB runs line 7 of your code, it tries to access the second element of the variable u (or to call a function named u wit...

6 jours ago | 1

How to reduce the file size of a saved histogram figure

You could avoid creating the histogram using the data by specifying 'BinCounts' and 'BinEdges'. If you do this, there won't be a...

6 jours ago | 1

| accepted

Is it possible to generate a Mex function which has within it another mex function?

I'm not 100% certain but if you're trying to generate code using MATLAB Coder on a file that calls a MEX-file, you may be able t...

6 jours ago | 0

Join strings together with '_' between them

Use the string append operator +. a = {'A11';'A12';'A21';'A22';'A23';'A24'}; b = {'A300';'A5300';'A291';'A5291'}; C1 = a + "_...

6 jours ago | 1

Identifying if reaction times are 3 standard deviations away from mean

Take a look at the "mean" method for the isoutlier function.

7 jours ago | 0

Translate sine coding? Need understanding

To start off, I suggest you start with the free MATLAB Onramp tutorial to quickly learn the essentials of MATLAB. Then work you...

7 jours ago | 1

How to fix the large and mad fractions when dealing with symbolic vars

Symbolically, use vpa or double or use the sympref function to change the FloatingPointOutput preference. Numerically, if you w...

8 jours ago | 1

Why is my table displaying 1x1 in workspace but displays actual values in command window?

You're creating a timetable whose elements are tables. If you want to change a table into a timetable instead take a look at the...

8 jours ago | 0

Is there a smoothing function with a coefficient that can tell the trend in my data. I used loess but is there a scaler that could tell if rising, falling or sustained

The detrend and trenddecomp functions may be of interest to you.

10 jours ago | 0

error when I try to open a file to edit

Do you have a function you've created named settings.m? Does the command below show just one item (in a subdirectory under toolb...

17 jours ago | 0

how can i change the value of a variable with a slider in matlab designer?

Rather than changing the value of a fixed variable I would likely retrieve the Value property of the slider object whenever I ne...

17 jours ago | 0

MPC toolbox computation time

If you're trying to analyze the performance of your Simulink model (to identify bottlenecks?) consider using Simulink Profiler.

17 jours ago | 0

I wan to display an image of size 512x512x150 using matlab.

Take a look at the tools listed in the Volume Visualization section of the documentation.

17 jours ago | 0

why my conditional function is not what I expected?

if X>=0 & X^2+Y^2<4 From the documentation for the if keyword: "if expression, statements, end evaluates an expression, and exe...

18 jours ago | 1

Why isn't my figure consistent? It keeps changing every time

Here's one line of your code. I've put it in block comments so MATLAB Answers won't try to execute it, since I have other code l...

19 jours ago | 0