LUA function plotter for sin(x)
Posted by Anonymous on Wed 1st Feb 2023 14:22
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view followups (newest first): LUA function plotter for sin(x) by Anonymous

-- test1.lua - simple function plotter in lua
-- written by Roland Mainz <roland.mainz@nrubsig.org>

-- Terminal size
TermSize = {w = 70, h = 20}


function term_clear ()
        io.write("\27[2J")
end

function term_cup (x,y)
        io.write(
                string.format("\27[%d;%dH",
                        math.floor(y),
                        math.floor(x)
                        )
                )
end


-- plot a function
-- (assume that domain&&image are in the range [-1,+1])
function plot (f)
        term_clear()

        for i=1, TermSize.w do
                local x = (i/TermSize.w)*2 - 1
                local y = (f(x) + 1)/2 * TermSize.h

                term_cup(i, y)
                io.write('X')
        end

        -- move cursor to the bottom
        term_cup(1, TermSize.h+1)
end

plot(function (x) return math.sin(x*2*math.pi) end)

-- EOF.