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Julia prelude
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# basic packages and plotting | |
versioninfo() | |
using FFTW, DSP, DataFrames, Query, Plots, StatsPlots; #plotlyjs() | |
const N=100 | |
plot(1:N,1:N |> x->cos.(2pi*x/N)+0sin.(2pi*x/N) |> fft |> x->abs.(x) |> fftshift) | |
# calling to C++ via LLVM | |
using Cxx | |
cxx"""#include <iostream>""" | |
cxx"""using namespace std;""" | |
icxx"""cout << 123+234 << endl;""" | |
#__current_compiler__ = Cxx.new_clang_instance() | |
# adding new packages | |
using Pkg | |
Pkg.add("CSV") | |
using CSV | |
# process tabled data | |
df=DataFrame(xs=1:N,ys=1:N |> x->sin.(2pi*x/N),zs=1:N |> x->cos.(2pi*x/N)) | |
display(df) | |
df1 = ( @from d in df begin | |
@where d.ys>.5 | |
@select d | |
@collect DataFrame | |
end ) | |
display(df1) | |
CSV.write("df1.csv",df1) | |
@df stack(df,[:ys,:zs]) plot(:xs,:value,group=:variable) | |
# get help | |
?CSV.write | |
# Units | |
using Pkg; Pkg.add("Unitful") | |
using Unitful | |
SpeedOfLight=299_792_458u"m/s" | |
freq=2.959u"GHz" | |
len=SpeedOfLight/u"s^-1"(freq) | |
display(len) | |
ustrip(len) | |
# Setup Conda (working with Python packages) | |
ENV["PYTHON"]="" | |
using Pkg | |
Pkg.build("PyCall") | |
Pkg.build("PyPlot") | |
Pkg.add("Conda") | |
# SciPy | |
using Conda | |
Conda.add("scipy") | |
using PyCall | |
so=pyimport("scipy.optimize") | |
display(so.newton(x->cos(x)-2x,1)) | |
using PyPlot | |
x=-3:.1:3 | |
plot(x,cos.(x)-2x,x,zeros(length(x))) | |
# SymPy | |
using Pkg | |
Pkg.add("SymPy") | |
using SymPy | |
x=symbols(:x) | |
eval(solve(x^4-x-1)) |
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