Julia function to display a given matrix prettily in Markdown/KaTeX, optionally limiting the number of rows/columns shown

displayMatrix.jl

using Markdown;
# Displays given matrix R in Markdown using KaTeX
# Optional parameter lims sets how many rows and columns (respectively) will be shown
# \cdots, \vdots, and \ddots are used in place of skipped cells
function dispMatrix(R, lims=[Inf,Inf])
    i = -1 # Start at beginIndex - 2 = 1 - 2 = -1. Minus 2 because one taken up by the \vdots, the other taken up by the last element
    sizes = size(R)
    show = min.(sizes,lims)
    str = "\$\$\\begin{bmatrix} "
    for row in eachrow(R)
        # We want to print the numbers for the first (limit-1) rows and the last row
        if(show[1] - 2 > i || sizes[1] == i+2)
            if(sizes[2] <= lims[2])
                # If we'll show the entire row, just join it together
                str *= join(row, " & ")
            else
                # Otherwise, get the first (limit-1) items and the last item only
                str *= join(row[1:show[2]-1], " & ")
                str *= " & \\cdots & "
                str *= string(row[sizes[2]])
            end
            str *= " \\\\ "
        # For the limit'th row, print the dots
        # This can be any row after (limit-1) as long as it happens only once,
        # I just arbitrarily picked the one following (limit-1)
        elseif(show[1] - 1 == i)
            # Again, this needs to behave differently depending on if we're showing the entire row
            if(sizes[2] <= lims[2])
                # If we are, just show[2] of \vdots in an array and join them with &'s
                dots = []
                for _ in 1:show[2]
                    push!(dots, "\\vdots")
                end
                str *= join(dots, " & ")
            else
                # Otherwise, we want to first show (limit-1) of \vdots, then \ddots, then \vdots again
                dots = []
                for _ in 1:show[2]-1
                    push!(dots, "\\vdots")
                end
                str *= join(dots, " & ")
                str *= " & \\ddots & \\vdots"
            end
            str *= " \\\\ "
        end
        i+=1;
    end
    str *= "\\end{bmatrix}\$\$"
    display(Markdown.parse(str))
end