## 2-D Plotting
## At the time of writing this techical report, plotting in Julia is not quite straighforward. There are several packages with varying 
## capabilities that grant flexibility in 
## choosing the underlying plotting device. PyPlot seems to be one of the popular packages that uses Python's matplotlib package. 
## In order to use this package, Julia must have access to a certain Python shared library. On maya, this can be done by starting 
## Julia as: >LD_LIBRARY_PATH=/usr/cluster/contrib/julia/0.5.0/share/julia/site/v0.5/Conda/deps/usr/lib/ julia

using PyPlot
plt = PyPlot;
# Read the data from a dat file.
datt = readdlm("../matlabdata.dat");
# Basic plotting of y vs x
plt.figure();
plt.plot(datt[:,1],datt[:,2]);
plt.savefig("julia_fig_1.png");

x1 = collect(-2*pi:4*pi/1024:2*pi);
y1 = x1 .* sin(x1.^2);
# now a better plot with title, grid etc.
plt.figure(); 
plt.plot(x1, y1);
plt.ylabel("f(x)");
plt.xlabel("x");
plt.title("Graph of f(x)=x sin(x^2)");
plt.grid(true);
plt.savefig("julia_fig_2.png");