Print sequence in F#

Question

I'm very new to F# so please excuse the completely newbie question:

I have a sequence stored in a variable called prices. I'd like to output the contents of this sequence to the interactive window. What's the easiest command to do this?

Here is my sequence:

> prices;;
val it : seq<System.DateTime * float> = seq []

I've tried printf'ing it but that gives me the error:

> printf("%A", prices);;

  printf("%A", prices);;
  -------^^^^^^^^^^^^

stdin(82,8): error FS0001: The type ''b * 'c' is not compatible with the type 'Printf.TextWriterFormat<'a>'

Any help would be appreciated.

Answer 1

printf does not take parentheses:

printfn "%A" prices;;

(See F# function types: fun with tuples and currying for details)

You might also convert the seq to a list, eg

printfn "%A" (Seq.toList prices);;

Answer 2

此外，您可以通过更改fsi。*属性（FloatingPointFormat，PrintWidth，PrintDepth，PrintLength，...）来控制交互式会话打印机功能。请参阅： http ：//cs.hubfs.net/forums/post/7438.aspx

Answer 3

> prices;;
val it : seq<System.DateTime * float> = seq []

It's doing its job: seq [] means the sequence is empty.