Converting Float to String with padding?

New to Julia
1

Simple question here, how could I emulate the effect of string(Int, pad=n) with floats?
Using string itself throws an error.

2

You can use the Printf standard library:

julia> using Printf

julia> @sprintf("%10.4g", 3.14159) # 10 characters, 4 digits of precision, right-justified
"     3.142"

julia> @sprintf("%-10.4g", 3.14159) # 10 characters, 4 digits of precision, left-justified
"3.142     "

julia> Printf.format(Printf.format"%-10.4g", 3.14159) # equivalent to the previous
"3.142     "

See printf, fprintf, sprintf, snprintf, printf_s, fprintf_s, sprintf_s, snprintf_s - cppreference.com for more options. You can also use this library to get finer control of integer printing.

2 Likes
3

An alternative, fwiw:

julia> lpad(string(round(pi, digits=2)), 6)
"  3.14"

julia> lpad(string(round(pi, digits=2)), 6, '0')
"003.14"