In R I can easily generate vectors of formatted strings like this: > sprintf("a%.2d", 1:10) [1] "a01" "a02" "a03" "a04" "a05" "a06" "a07" "a08" "a09" "a10" What is the closest in julia? As @sprintf is a macro I cannot do using Printf @sprintf.("a%.2d", 1:10) ERROR: syntax: invalid macro usage "…

It’s not the closest to your example, but i guess most idiomatic in julia. julia> "a" .* lpad.(1:10, 2, '0') 10-element Vector{String}: "a01" "a02" "a03" "a04" "a05" "a06" "a07" "a08" "a09" "a10"

Thank you @rafael.guerra . They way I understand your comment, the suggestion is something like this: Printf.format.(Ref(Printf.Format("a%.2d")),1:10) 10-element Vector{String}: "a01" "a02" "a03" "a04" "a05" "a06" "a07" "a08" "a09" "a10" Also a bit long for my taste.

There’s a string macro which is a bit tidier. I wonder why Format objects aren’t made scalar under broadcasting, since they aren’t iterable / indexable. That’s a small change, a larger one would be to make them callable: julia> using Printf: format, @format_str, Format julia> Broadcast.broadcastab…

Thanks @mcabbott This is a lot closer to what I would expect from julia - in particular the last one. But it is annoying that @format_str is not exported and it does not work “out of the box”.

[image] mcabbott: I wonder why Format objects aren’t made scalar under broadcasting Would be an easy PR if anyone wants to take it on. Maybe file an issue and mark it with the “Good first issue” tag.

Thanks @rmsmsgood I totally forgot about lpad :smile:

Vectorized sprintf?

General Usage

rafael.guerra December 11, 2022, 3:20pm 2

You can try Printf.Format, see example here., or use a helper function as here.

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Vectorized sprintf?

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