Underline numbers in matrix

General Usage
1 
julia> Matrix(reshape(1:100,10,10))
10Γ—10 Matrix{Int64}:
  1  11  21  31  41  51  61  71  81   91
  2  12  22  32  42  52  62  72  82   92
  3  13  23  33  43  53  63  73  83   93
  4  14  24  34  44  54  64  74  84   94
  5  15  25  35  45  55  65  75  85   95
  6  16  26  36  46  56  66  76  86   96
  7  17  27  37  47  57  67  77  87   97
  8  18  28  38  48  58  68  78  88   98
  9  19  29  39  49  59  69  79  89   99
 10  20  30  40  50  60  70  80  90  100

How to underline the perfect squares 1,4,9 etc?

2

PrettyTables.jl may help you do that… but I don’t think it allows underlining.

3

This underlines the squares, but the alignment is off:

julia> issquare(n) = isqrt(n)^2 == n

julia> import Markdown

julia> [Markdown.parse(issquare(i) ? "_$(i)_" : "$i")  for i in reshape(1:100,10,10)]

This prints the squares in bold (using Unicode bold digits):

julia> boldnum(n::Integer) = map(c -> c + ('𝟎'-'0'), string(n))

julia> [Text(issquare(i) ? boldnum(i) : "$i")  for i in reshape(1:100,10,10)]
10Γ—10 Matrix{Text{String}}:
 𝟏   11  21  31  41  51  61  71  πŸ–πŸ  91
 2   12  22  32  42  52  62  72  82  92
 3   13  23  33  43  53  63  73  83  93
 πŸ’   14  24  34  44  54  πŸ”πŸ’  74  84  94
 5   15  πŸπŸ“  35  45  55  65  75  85  95
 6   πŸπŸ”  26  πŸ‘πŸ”  46  56  66  76  86  96
 7   17  27  37  47  57  67  77  87  97
 8   18  28  38  48  58  68  78  88  98
 πŸ—   19  29  39  πŸ’πŸ—  59  69  79  89  99
 10  20  30  40  50  60  70  80  90  𝟏𝟎𝟎
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