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Neil Guertin

MathWorks

Last seen: meer dan 2 jaar ago |  Active since 2017

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

meer dan 6 jaar ago | 1

Answered
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>

meer dan 6 jaar ago | 0

Answered
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...

meer dan 6 jaar ago | 0

Answered
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...

meer dan 6 jaar ago | 0

Answered
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...

meer dan 6 jaar ago | 0

| accepted

Answered
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...

meer dan 6 jaar ago | 0

| accepted

Answered
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...

meer dan 6 jaar ago | 0

| accepted

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

bijna 7 jaar ago | 0

Answered
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...

bijna 7 jaar ago | 0

| accepted

Answered
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...

bijna 7 jaar ago | 3

| accepted

Answered
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...

bijna 7 jaar ago | 1

Answered
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...

bijna 7 jaar ago | 0

| accepted

Answered
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 ...

bijna 7 jaar ago | 0

Answered
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...

bijna 7 jaar ago | 0

| accepted

Answered
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 ...

bijna 7 jaar ago | 1

| accepted

Answered
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...

bijna 7 jaar ago | 0

| accepted

Answered
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...

bijna 7 jaar ago | 1

Answered
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 ...

bijna 7 jaar ago | 0

| accepted

Answered
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.

ongeveer 7 jaar ago | 0

Answered
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...

ongeveer 7 jaar 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...

ongeveer 7 jaar 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...

ongeveer 7 jaar ago

Solved


Energy of a photon
*&#9883 &#9762 &#9883 &#9762 &#9883 &#9762 &#9883* Given the frequency F of a photon in giga hertz. Find energy E of this...

ongeveer 7 jaar ago

Solved


How to subtract?
*&plusmn &plusmn &plusmn &plusmn &plusmn &plusmn &plusmn &plusmn &plusmn &plusmn &plusmn* * Imagine you need to subtract one...

ongeveer 7 jaar ago

Answered
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 ...

ongeveer 7 jaar ago | 0

| accepted

Answered
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...

ongeveer 7 jaar ago | 0

| accepted

Answered
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...

ongeveer 7 jaar ago | 0

Answered
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...

ongeveer 7 jaar ago | 0

Answered
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...

ongeveer 7 jaar ago | 0

Answered
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...

ongeveer 7 jaar ago | 1

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