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Neil Guertin

MathWorks

Last seen: 2 years 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...

6 years 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>

6 years 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...

6 years 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...

6 years 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...

6 years ago | 0

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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...

6 years ago | 0

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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...

6 years ago | 0

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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...

7 years 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...

7 years ago | 0

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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...

7 years ago | 3

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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...

7 years 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...

7 years ago | 0

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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 ...

7 years 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...

7 years ago | 0

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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 ...

7 years ago | 1

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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...

7 years ago | 0

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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...

7 years 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 ...

7 years ago | 0

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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.

7 years 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...

7 years ago | 3

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 ...

7 years ago | 0

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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...

7 years ago | 0

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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...

7 years 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...

7 years 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...

7 years 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...

7 years ago | 1

Answered
Is there a built-in Demosaicing option in Matlab which doesn't use interpolation and instead just reduces the image size?
There is not currently a built in way to do this. However, it is pretty simple to write: I = imread('mandi.tif'); I = I(1:...

7 years ago | 0

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Answered
I need help grouping randomly oriented platelets into stacks using two different criteria.
Each platelet's location can be represented by a 1x6 vector, with the first three entries representing position as you have done...

7 years ago | 0

Answered
Best way to keep sequential graphics-updating commands from interfering?
Add a call to "drawnow" after the call to "subplot". This will force the figure to render and finish calculating the axes positi...

7 years ago | 0

Answered
roots function algorithm basis
According to the documentation, "The roots of the polynomial are calculated by computing the eigenvalues of the companion matrix...

7 years ago | 0

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