Chad Greene

Last seen: 7 days ago

NASA Jet Propulsion Laboratory

1,268 total contributions since 2012

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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Answered
plot using latitude and longitude
That looks like you have scattered data. If you have an array of latitudes, an array of longitudes, and a corresponding array of...

27 days ago | 0

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Answered
polybuffer distance in meters?
I think you've got it right, Alex, but this calls for an explanation of the phrase numeric scalar. The word numeric just means a...

27 days ago | 1

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ploting 2d graph of a vector
You've pretty much got it, but you'll need to define a range of t values, and a value for the constants A, and B. You also need ...

1 month ago | 0

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Submitted

Climate Data Toolbox for MATLAB
A set of low-level functions and tutorials for analyzing and displaying Earth science data.

1 month ago | 256 downloads |

Answered
Specific color corresponding to specific data usin contourf colormap
Perhaps @Kelly Kearney's contourfcmap is what you need?

1 month ago | 0

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Make a vector plot of the velocity field in polar coordinates
Can you use cart2pol to convert the coordinates and vector components to polar coordinates?

1 month ago | 0

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Why ?? Undefined function 'crosscorr' for input arguments of type 'double'.
crosscorr is part of the econ toolbox. If you don't have that toolbox, you can probably rewrite your code to use xcorr instead. ...

1 month ago | 0

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Fit data recorded with different internal clocks
This is an interesting problem. If you can identify a few peaks that occur throughout the 600 s measurement, and those peaks are...

1 month ago | 0

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How to create map with [x;y] coordinates? Mapping toolbox
No guaratees on the accuracy of the attached functions, but you may be able to convert between lat,lon and x,y using the attache...

1 month ago | 0

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Answered
How can i solve for this issue with the logical flow
I think the error is here: term3=q(i-1)*((r(i)-dr)/r(i)*dr); The first time through the loop, i=1, meaning i-1=0. There is no...

1 month ago | 0

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Answered
Adding line change the size of the image
Can you get the axis limits before plotting the lines, and then set the axis back to those limits afterwards? Something like thi...

1 month ago | 0

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Color along line in polaraxes
What if you interpolate along a dense line and plot with polarscatter? I'm thinking something like this: theta = linspace(0,...

1 month ago | 0

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Answered
How to make a surface plot of imported data of a numerical function z=f(x,y)
Just to be clear, you already have the data, and it takes this form M = [x y z]; where x, y, and z are columns? My next qu...

1 month ago | 0

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time position in graphic
This question is pretty vague, but here's pi displayed at the bottom right corner of a plot: txt = text(1,0,num2str(pi,'%4i'),...

1 month ago | 1

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Answered
I have a climatic dataset of a region where I am calculating time series (for drought index). The dimension of the dataset is 164*153*1416 (1416 months in the dataset and the others are the location). How I can average this over space and time?
To get a map of average SPEI, SPEI_mean = mean(SPEI,3,'omitnan'); and that calculates the mean along the third dimension (ti...

1 month ago | 0

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Answered
Antarctic Mapping Tool: how can I evaluate the distance of a point from the coastline?
The easiest solution is the dist2mask function in the Antarctic boundaries add-on for AMT. Syntax is d = dist2mask('openocean'...

1 month ago | 0

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How to mask a 3-D raster using a multiple feature attribute shapefile?
Try this: mask = inpolygon(X,Y,[roi.X],[roi.Y]); You don't even need to remove the trailing nans. :)

1 month ago | 0

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how to turn netcdf into contour map
Hi Abigail, The first thing I do with a netcdf file is type ncdisp('myfile.nc') to see what's inside it. If you have some ...

1 month ago | 0

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Answered
Extracting data from matrix
To only plot the ocean data, try masking out the land data by setting those values in A to NaN. like this: A(B==1) = NaN; % se...

1 month ago | 0

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Answered
Equal Sized random assortment, using randi?
This would be one way to define how many ones and how many twos in each column before randomizing them: N_cols = 8; % number o...

1 month ago | 0

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PCA Graph of Data Comes Up Blank
I think you're mixing and matching different ways of defining filenames. As a result, dir is unable to find the files you're loo...

1 month ago | 0

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datestr generating different string
How about myy = 2014; mym = 1; myd = 20; datestr(datenum(myy,mym,myd),'dd/mm/yyyy')

1 month ago | 0

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Answered
Three column table into matrix
I think table2array is the function you're looking for.

1 month ago | 1

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How to find data points within 2% tolerance of curve
Sounds like a nice homework problem. You'll probably want to use logical indexing to find the indices of the Y data that are w...

2 months ago | 0

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Plotting multiple graphs from multiple ranges in excel
The easiest way is probably to read the full range of data all at once, then loop through the different ranges you want to plot....

2 months ago | 0

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Getting a filter error today when yesterday didn't?
I suspect that yesterday you weren't including x in the filter. Yesterday you were filtering the d signal, which is just [1 0 0 ...

2 months ago | 0

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How do I fix my display of the x and y values? They should be x = 1.15 and y = 3.85.
The double equals is defining x and y as a boolean. It's saying x = 1 if minimum_voltage equals acosd(B/2*A)*5/180. Let's find o...

2 months ago | 0

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How can i create these three images in one figure?
If you're question is about how to make subplots, here's how. figure subplot(3,1,1) plot(sind(1:1e4)) subplot(3,1,2) plot...

2 months ago | 0

Answered
How can I compute the mean value over a time interval?
Hi Anna, welcome to the forum. With these types of questions it always helps if you can provide a minimal working example. But...

2 months ago | 0

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What MATLAB functions are underappreciated?
One of the most powerful functions I know of took me years from hearing about its existence to using it regularly, because it's ...

2 months ago | 3