多维数组，格式为julia script / print（）中的shell Array输出

Question

When in the Julia shell if you run the function zeros(5, 5) you get something that looks like this:

 0.0  0.0  0.0  0.0  0.0
 0.0  0.0  0.0  0.0  0.0
 0.0  0.0  0.0  0.0  0.0
 0.0  0.0  0.0  0.0  0.0
 0.0  0.0  0.0  0.0  0.0

If you store the multidimensional array in a variable and print it (or directly print it) in the shell or an external script, you will get the much uglier:

[0.0 0.0 0.0 0.0 0.0; 0.0 0.0 0.0 0.0 0.0; 0.0 0.0 0.0 0.0 0.0; 0.0 0.0 0.0 0.0 0.0; 0.0 0.0 0.0 0.0 0.0]

Is there a way to access the Array's builtin STDOUT formatter that displays it the human readable way in the shell?

Answer 1

Use display(x) instead of print(x) .

Note that print(x) can be useful in situations where you need copy-paste-runnable code.

Answer 2

to complete @crstnbr answer I would also suggest show

M=rand(2,3)
f = open("test.txt","w")
show(f, "text/plain", M)
close(f)

then if you read and print test.txt you get:

julia> print(read("test.txt",String))
2×3 Array{Float64,2}:
 0.73478   0.184505  0.0678265
 0.309209  0.204602  0.831286 

note: instead of file f you can also use stdout.

To save some data in a stream the function show is more suited than display , as explained in the docs ( ?display ):

  In general, you cannot assume that display output goes to stdout (unlike print(x) or show(x)). For example, display(x) may open up a separate window with an image. display(x) means "show x in the best way you can for the current output device(s)." If you want REPL-like text output that is guaranteed to go to stdout, use show(stdout, "text/plain", x) instead.