Sorry for another stupid question. It is a little similar with How to repeat the format in @printf? - #12 by CRquantum However i want to be more creative by design my own fmts in Printf. The idea is simply, I looked at Printf · The Julia Language There is a simply example there, @printf("%f %F …

A very basic example below. Recommend you search discourse for more complete examples. str = Printf.format(s, Inf, Inf, NaN, NaN) io = open("fileout.txt", "a"); write(io, str); close(io); or better: io = open("fileout.txt", "a"); Printf.format(io, s, Inf, Inf, NaN, NaN) close(io);

It seems to be the same problem with the same solution as in the other post: s = Printf.Format("%f %F %f %F"); Printf.format(s, Inf, Inf, NaN, NaN)

Thank you very much. Sorry I was a little sleepy and asked a stupid question again. I see, the great thing of Printf.Format is that it allows me to put string() inside, like, s = Printf.Format(string("%f"^4,"%f"^4)) So can define anything. May I ask, how to use or is it possible to use Printf.f…

With @sprintf it is more compatible with “R”…and IMO simpler. [img]

Maybe the do-block form of open would be better to suggest? open("fileout.txt", "a") do io Printf.format(io, s, Inf, Inf, NaN, NaN) end That way the file handle is still closed in case format throws an exception (using a try-finally block under the hood).

While format strings are a powerful DSL, I would stop short of including conditionals and control flow and use Julia instead. That is, if you need to construct a format string on the fly, just encapsulate the logic in a function that branches to the appropriate @printf "%f" value or @printf "%F" val…

[image] ericphanson: open("fileout.txt", "a") do io Printf.format(io, s, Inf, Inf, NaN, NaN) end Thank you very much indeed! May I ask one more thing, if I set array A as A = [Inf, Inf, NaN, NaN] can I just print this array in a way like Printf.format(io, s, A) ?

[image] CRquantum: Printf.format(io, s, A) I think this should work: Printf.format(io, s, A…)

Can I define string as "%Fmt" in Printf?

General Usage

rafael.guerra August 21, 2021, 1:23pm 6

Your example does not seem to answer OP’s question. See the post linked by OP, the eval method and this comment.

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Can I define string as "%Fmt" in Printf?

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