# How to Convert Computation Result in Julia in pi terms?

Hi all,

I want to show the result of my computation in pi terms, instead of float with lots of decimal numbers. Is it possible?

Here is my code:

using Plots, LaTeXStrings; gr()
#=
# To plot a curve starting at (0, 0)
θ = 0:0.1:4.1π
x = θ .- sin.(θ)
y = 1 .- cos.(θ)
plot(x, y, xlims=(0,15), ylims=(0,4),
label=L"(x,y) = (\theta - \sin \ t , 1 - \cos \ t)",
framestyle=:zerolines, aspect_ratio=:equal)
=#

println("t \t x \t \t y")
for N in 0:pi/2:4*pi
x1 = (N) - sin.(N)
y1 = 1 - cos.(N)
println("$N \t$x1 \t \$y1")
end



I want it like the left table:

Here is an idea using PrettyTables package:

julia> using PrettyTables

julia> println(pretty_table(String,
vcat([[string(t)*"π" t*π-sinpi(t) 1-cospi(t)] for t in 0:0.5:4]...);
┌──────┬──────────┬──────┐
│    t │     x(t) │ y(t) │
├──────┼──────────┼──────┤
│ 0.0π │      0.0 │  0.0 │
│ 0.5π │ 0.570796 │  1.0 │
│ 1.0π │  3.14159 │  2.0 │
│ 1.5π │  5.71239 │  1.0 │
│ 2.0π │  6.28319 │  0.0 │
│ 2.5π │  6.85398 │  1.0 │
│ 3.0π │  9.42478 │  2.0 │
│ 3.5π │  11.9956 │  1.0 │
│ 4.0π │  12.5664 │  0.0 │
└──────┴──────────┴──────┘


UPDATE: corected according to Oscar_Smith suggestion to use sinpi, cospi

1 Like

For rational fraction display take a look at this post.

1 Like

note that we have sinpi and cospi

2 Likes

Thanks for the PrettyTables suggestion