rekil156/julia

julia
to open a package manager - ]
to add a package - add Pluto
to quit - ctrl+c

save - use local folder location + filename to save locally
/Users/rekilprashanth/Documents/GitHubPersonal/julia/notebooks/

Adding a package in code.

setting up an empty package environment

begin
    import Pkg
    Pkg.activate(mktempdir())
    Pkg.Registry.update()
end

add (ie install) a package to our environment

begin
    Pkg.add("Compose")
    # call `using` so that we can use it in our code
    using Compose
end

begin
    Pkg.add("PlutoUI")
    using PlutoUI
end

Lesson1

• adding packages

begin
    import Pkg
    Pkg.activate(mktempdir())
end

begin
    Pkg.add(["Images", "ImageIO", "ImageMagick"])
    using Images
end

• writing multiple statements in a begin-end block a = begin b =1; c=4; b+c end

• typeof(image)

• size(image)

• reverse(image, dims =2)

• img_copy = copy(image)

• BROADCASTING

begin 
    new_img = copy(old_img)
    new_img[100:200, 1:100] .= RGB(0, 1, 0)
    new_img
end

• BROADCASTING FUNCTION

# define a function that turns a colour into just its red component
function redify(color)
    return RGB(color.r, 0, 0)
end

redify.(image)

• Adding UI element

begin
    Pkg.add("PlutoUI")
    using PlutoUI
end 

adding a slider

@bind deciamte_ratio Slider(1:10, show_value=true)
decimate(img,deciamte_ratio)