MTH 229

Meeting times: Wednesday 12:20 - 2:15, 1S-103. We will meet Tuesday April 7th instead of April 8th.

Test 1 is scheduled for March 11; Test 2 for April 22; the final will likely be May 20.

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Using Julia in 1S-103:

Unfortunately Julia is not installed on the image in 1S-103. Consequently, we will utilize one of several workarounds (more may be added):

• is an option. Click the button, and somewhere on the internet your own version of Julia will start up. This can take a minute, so read the static project while you wait. Once loaded, you will have an interactive Julia session.

This link will load faster, but seemed flaky.

• juliabox.com This site hosts Julia for a fee. Currently the first month is free, and thereafter it is 7 dollars a month for academic use. To use juliabox you will need to install some software (below).

• cocalc.com This site is free for simple use, but for this class, a paid account is necessary. The rate is 14 dollars per semester. You must email me at verzani@math.csi.cuny.edu and I can add you as a student. This makes it easy to access the projects. You will still need to install some software (below).

• Install julia on a laptop. Julia is free software and can be downloaded from julialang.org. Once downloaded, you would need to configure your installation.

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Configuring your system.

Install IJulia

Binder, juliabox, and cocalc all provide a notebook interface. However, if installing julia on a laptop, you will want to install IJulia so that you can interact with julia using a notebook interface, instead of the command line interface. To do so, you must install the IJulia package. Open julia and a "terminal" will present itself. At the terminal type in:

] add IJulia

then press enter. This will install IJulia. You do this once. After it is installed each time you wish to use julia you open the terminal and type these two commands:

using IJulia
notebook()

This opens a directory that allows you to open a notebook. At first, you should open a new notebok using the "New" button on the right side.

Install the MTH229 package

This class uses a package to provide various conveniences. Packages are how julia can be enhanced. Like IJulia, you install a package once, but have to load it each time you start a session. The MTH229 package can be installed with these commands (watch the capitalization):

using Pkg
Pkg.add(PackageSpec(url="https://github.com/mth229/MTH229.jl.git"))

To use this package, you simply issue the command

using MTH229

Install the projects

Copy these commands into an IJulia cell and execute

using Pkg
Pkg.add("ZipFile")
using ZipFile
r = ZipFile.Reader(download("https://github.com/mth229/229-projects/archive/master.zip"));
for f in r.files
  basename(f.name) == "" && continue
  io = open(basename(f.name), "w")
  write(io, read(f, String));
end

This will download the files into your current directory. They should now be viewable from the IJulia directory listing, though you may need to refresh that page.