# Neil Guertin

### MathWorks

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**Feeds**

'griddatan' much slower than 'scatteredInterpolant'

The 'griddatan' function and 'scatteredInterpolant' object process the data differently, which leads to the difference in perfor...

6 years ago | 1

Robin condition in a 1D FEM matlab code

You may find some useful information here: <https://www.mathworks.com/help/pde/ug/elliptic-pdes.html>

6 years ago | 0

WMS Layer "True Color (1 day - Aqua/Modis Rapid Response)" resolution problem

The map returned is the full 2048x2048 pixels, but it looks like the zoom level is wrong. The server might assume the zoom level...

6 years ago | 0

How do i map the temperature for the colors ,i.e RGB respectively from a Falsely colored image ( my own code using for loops) ?

You can change the colors in the figure by using a different colormap. A list of built in colormaps are available in our documen...

6 years ago | 0

Printing a figure as .eps w/o letting the size change

This is a known issue and our developers are currently investigating. As a workaround, consider: # Using the -opengl optio...

6 years ago | 0

| accepted

AdaBoost Regression to Select Predictors

The fitrensemble function uses the LSBoost algorithm. Then you can use the removeLearners function to remove members of the ense...

6 years ago | 0

| accepted

orthogonal polynomial function in matlab similar to the R function poly()

The Legendre and Jacobi polynomials are orthogonal and can be easily generated in using the Symbolic Math Toolbox. <https://w...

6 years ago | 0

| accepted

What is image what?

Once you have produced the initial unfiltered segemented image, you can use morphological operations such as imopen or imerode t...

6 years ago | 0

How can I feed MATLAB's integral2 a vector of parameters using nested functions?

There is currently no way to do this using integral2. As a workaround you could run integral2 separately for each parameter valu...

6 years ago | 0

| accepted

How do I copy over only one legend entry from each plot using copyobj()?

When creating a legend, you can specify exactly the objects you want to appear in it. In this case, you will want to recreate th...

6 years ago | 3

| accepted

Why don't figures show up when I open a live script saved as a HTML file on a different computer?

The CSS and image data should be stored directly in the HTML source file itself. Most likely your browser just isn't rendering i...

6 years ago | 1

How Matlab access data in nested structures?

For a situation like this, code readability and adaptability is much more important than performance. Even if one of these metho...

6 years ago | 0

| accepted

Convert datetime to time of day, to be able to plot along time (e.g. 08:00, 10:00, 12:00 14:00...)

Use the timeofday function to convert your datetime objects to duration objects. You should be able to use the duration objects ...

6 years ago | 0

evaluate chebyshev polynomials takes too long

No matter how you do it, evaluating a polynomial at 10,000,000 different points is going to take a long time. I would suggest tr...

6 years ago | 0

| accepted

Change Legend Markers after legend creation in App Designer

There is no currently supported way to get access to the icons of a legend in App Designer. As a workaround you could create an ...

6 years ago | 1

| accepted

Blurry latex text on plots (help!) (matlab 2017a)

Try increasing the resolution when you export the figure. You can do this with the -r option of the print command. <https://w...

6 years ago | 0

| accepted

How to select a region of interest (ROI) from 3-d point cloud data?

Your first approach seems like the right way to do this. However it looks like your ROI is not orthogonal to the axes, and there...

6 years ago | 1

Getting number of data points for training, validation and testing of neural network; showing the training and testing data of neural networks?

nntool is an older tool and is not recommended. Use nnstart instead. From there you can get to the Neural Fitting app which has ...

6 years ago | 0

| accepted

Cannot progress in matlab fundamentals course - matlab academy fails to communicate with workers and closes every time.

Hi Sam, I've notified our Customer Service team about this issue. Someone should reach out to you next week.

6 years ago | 0

Why do I receive the error "Undefined function or variable 'usejava'" when trying to start MATLAB 6.x (R12.x)?

Instead of rewriting pathdef.m manually, the safest and best way to regenerate it is as follows: # Delete pathdef.m # Recrea...

6 years ago | 3

Solved

5th Time's a Charm

Write a function that will return the input value. However, your function must fail the first four times, only functioning prope...

6 years ago

Solved

The 5th Root

Write a function to find the 5th root of a number. It sounds easy, but the typical functions are not allowed (see the test su...

6 years ago

Solved

Energy of a photon

*⚛ ☢ ⚛ ☢ ⚛ ☢ ⚛* Given the frequency F of a photon in giga hertz. Find energy E of this...

6 years ago

Solved

How to subtract?

*± ± ± ± ± ± ± ± ± ± ±* * Imagine you need to subtract one...

6 years ago

Roipoly on UI axes

roipoly and impoly are not supported in App Designer as of R2017b. The error message in R2016b and R2017a says "HPARENT must ...

7 years ago | 0

| accepted

How to schedule employees that only work continually one shift a day?

Each column of A corresponds to a potential shift for one employee. For example, find(A(:,1)) shows that column 1 has entries in...

7 years ago | 0

| accepted

Why do I receive an error when I try to run MatLab (R2017b)?

This is most likely caused by a firewall, antivirus, or other security software. You must be able to access esd.mathworks.com fo...

7 years ago | 0

Piecewise function for black-scholes

piecewise expects a value in the second and fourth arguments, and what you have entered is not valid syntax there. What you n...

7 years ago | 0

Matrix condition in ordinal logistic regression

That warning comes from an mldivide (backslash) operation within mnrfit. Since the reciprocal condition number of that matrix is...

7 years ago | 0

Error Saving Figure: Error using hgexport (line 1051) Error using print (line 215) Images must contain fewer than 2^32 -1 bytes of data

When saving a .fig file, the entire contents of the figure must be saved for future editing, including all of the data, which in...

7 years ago | 1