Plot with x-axis in radians with ticks at multiples of pi

General Usage
3

A working example with Plots.jl:

using Plots, LaTeXStrings
pyplot(fmt=:svg)

function pitick(start, stop, denom; mode=:text)
    a = Int(cld(start, π/denom))
    b = Int(fld(stop, π/denom))
    tick = range(a*π/denom, b*π/denom; step=π/denom)
    ticklabel = piticklabel.((a:b) .// denom, Val(mode))
    tick, ticklabel
end

function piticklabel(x::Rational, ::Val{:text})
    iszero(x) && return "0"
    S = x < 0 ? "-" : ""
    n, d = abs(numerator(x)), denominator(x)
    N = n == 1 ? "" : repr(n)
    d == 1 && return S * N * "π"
    S * N * "π/" * repr(d)
end

function piticklabel(x::Rational, ::Val{:latex})
    iszero(x) && return L"0"
    S = x < 0 ? "-" : ""
    n, d = abs(numerator(x)), denominator(x)
    N = n == 1 ? "" : repr(n)
    d == 1 && return L"%$S%$N\pi"
    L"%$S\frac{%$N\pi}{%$d}"
end

a, b = -2π, 2π
plot(sin, a, b; xtick=pitick(a, b, 4), label="y = sin(x)", size=(720, 250))

image
image1420×485 71.7 KB

plot(sin, a, b; xtick=pitick(a, b, 4; mode=:latex), label="y = sin(x)", size=(720, 250), tickfontsize=10)

image
image1440×477 67.8 KB

Edit: LaTeX style tick labels

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