Chad Greene

NASA Jet Propulsion Laboratory

Last seen: Today | Active since 2012

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I am interested in the floating ice shelves that fringe East Antarctica. My current work is toward building a better understanding of how climatology influences glaciology via oceanography. I also have some experience with the acoustics of gas hydrates and oceanic methane bubbles. Homepage: www.chadagreene.com Professional Interests: Antarctic ice shelf dynamics, sea level rise, underwater acoustics, methane hydrates Note: I will not do your homework for you and I will not respond to emails directing me to a question posed on the Answers forum.

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How to change figure size?
The paper size options are for printing, so they don’t change the size of the figure. The ‘Position’ property sets the size of ...

9 days ago | 37

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Labeling image region properties
I have a binary image, and I'd like to create a corresponding mask that contains a value in each pixel for the area of each regi...

9 months ago | 1 answer | 0

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External monitor crashes MATLAB R2023b
Using OSX 13.6.3, whenever I connect or disconnect my external monitor, all text in the MATLAB editor goes blank and I get a spi...

11 months ago | 2 answers | 0

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Defining the central longitude in Arctic borders in the Arctic Mapping Tool
Try this. Into the Command Window type open arcticborders Then find the line where it loads the border data. Try adding this...

12 months ago | 0

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How to download multiple files from a website
This question has been asked many times in various ways on this forum, but I've never found a simple answer to this very simple ...

1 year ago | 1 answer | 0

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Answered
How to plot locations on a polar stereographic map?
With Antarctic Mapping Tools, use plotps. Use plotpsn in the Arctic Mapping toolbox for northern hemisphere.

1 year ago | 3

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R2022b does not start after Update 3
Today I opened R2022b on my Mac OS 12.6.1, and after working for a few minutes I noticed that Update 3 is available for this MAT...

2 years ago | 2 answers | 0

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Opening multiple instances of MATLAB causes endless folder access errors
Whenever I try to open two instances of MATLAB, I run into an endless loop of error windows. For example, if I'm running 2022b a...

2 years ago | 1 answer | 1

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Text in editor window suddenly vanishes in R2022b.
I've run into lots of strange behavior using R2022a and R2022b on my MacOS Monterey 12.6.1, and until now it's been mostly just ...

2 years ago | 1 answer | 0

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Missing text objects when exporting graphics in R2022b
Since upgrading to R2022b, I've repeatedly run into an inssue in which text objects, legends, titles, etc do not get printed, or...

2 years ago | 1 answer | 1

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Answered
Changing the orientation Arctic Projection maps
I typically bypass the Matlab Mapping Toolbox for stereographic projections, because the functions are kind of clunky and slow. ...

2 years ago | 0

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Extract coordinates from a geopolyshape
@Sergey Kostrukov I think I found a working solution. The m_shaperead function in M_Map can handle PolygonZ and PolyLineZ data. ...

2 years ago | 0

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Duplicating an entire vector
You almost got it. Try repmat(A,[1 3])

2 years ago | 0

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How to read modern shapefile data
It seems increasingly common these days that data providers are saving shapefile data as PolygonZ or PolyLineZ data, rather than...

2 years ago | 2 answers | 1

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Glitchy Command Window behavior in R2022a and R2022b
I've got a MacOS 12.6.1, and I've noticed since I upgraded to R2022a that the cursor in the Command Window no longer behaves pre...

2 years ago | 0 answers | 2

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parpool failed to start
I'm trying to start a parallel pool in Matlab 2020b, but the pool repeatedly fails to start. Can anyone offer any guidance? Here...

2 years ago | 0 answers | 0

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calling a built-in private function
I'm using stream2 for a big problem that takes about a week to run on a high-performance computer. The profiler tells me that mo...

2 years ago | 1 answer | 0

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Answered
Mapshow : attribute colors to polygons according to ID
Try this. Define a list of colors, and plot each gridcode region seperately. climate = shaperead('c1976_2000.shp'); % List...

2 years ago | 0

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Answered
Is it possible to define colormap ranges or merge colormaps?
Try concatenating colormaps, like this. Below I'm using my cmocean colormaps, which are available on File Exchange, but you can ...

2 years ago | 1

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stream2 fails if coordinates are single precision?
I've encountered a strange behavior with stream2 which fails silently if any input coordinates are single precision. It looks li...

2 years ago | 1 answer | 0

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Answered
Boundary/polygon around coastline of Greenland
I've just added a 'gl' option to plot Greenland's grounding line using BedMachine's mask. https://github.com/chadagreene/BedMach...

2 years ago | 1

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Unfamiliar .D0 number syntax
I've inherited some Matlab code that was previously adapted from Fortran, and the Matlab code has a syntax I'm not familiar with...

2 years ago | 1 answer | 0

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XData and YData from area chart
I'm using the area function to create a stacked area chart of hundreds of time series. After plotting my data via h = area(t,Y...

3 years ago | 1 answer | 0

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Answered
Can anyone help me with the a tentative guide on how to average across the two dimensions of a 3d array, and loop it across 86 timesteps?
If you have a temperature data cube T whose dimensions correspond to lat x lon x time, the simplest way to get an 86x1 array of ...

3 years ago | 1

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Answered
Better “centerpoint” than centroid of a concave polygon
I added a polycenter function to do exactly what you need in the Climate Data Toolbox for Matlab. If you have a shapefile, the...

3 years ago | 0

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What should go in a next-generation MATLAB X?
If I could design Matlab from scratch I'd get rid of semicolons to suppress output, and make element-wise operations the def...

3 years ago | 0

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What should go in a next-generation MATLAB X?
I'd like to define ranges using square brackets for inclusive and rounded brackets for exclusive. So insead of if x>=20 & x<30...

3 years ago | 0

Answered
How can I convert a shapefile boundaries to lat and lon?
If it's a standard map projection, use projinv.

3 years ago | 0

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Answered
How to find a figure's centroid inside a polyshape?
Also answered here, but reposting my answer in case anyone stumbles upon this thread. I just ran into this problem when trying...

3 years ago | 0

Answered
Better “centerpoint” than centroid of a concave polygon
I just ran into this problem when trying to place a text label in the middle of a crescent-shaped ice shelf. The centroid or the...

3 years ago | 1

Chad Greene

NASA Jet Propulsion Laboratory

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