Serialize and deserialize generic functions

[Cristóvão Duarte Sousa]

Hi,

I would like to do something like

f(x) = x+1

open("f.jld", "w") do file

    serialize(file, f)

end

then, close julia, open it again and do

open("f.jld", "r") do file

    f = deserialize(file)

end

f(1)

but that gives "ERROR: f not defined"

Is serialization supposed to be able to do this?

If yes, which is the right way to code it?

Thanks

[Ivar Nesje]

This does not solve your problem, but you will get closer if you declare f as global so that you do not write to a local variable that will go out of scope as soon as it gets declared.

open("f.jld", "r") do file

    global f = deserialize(file)

end

f(1)

ERROR: function f not defined on process 1
in error at error.jl:21
in anonymous at serialize.jl:353

I am not sure how deserialization of functions is intended to work, so this is all I could do.

[Cristóvão Duarte Sousa]

Thanks Ivar for pointing that error of mine. I'd previously written the deserialize in the main scope and got the same "function f not defined on process 1", but then I rewrite it inside the `do` block without noticing it introduces another scope.

So the real ERROR is the one you presented.

Meanwhile I worked around this issue by serializing not the function but its Expression which is evaluated after the deserialization.

However, I still wonder if it is possible to do something like what I was trying.

[Stefan Karpinski]

You can use the fact that open returns the value of the block:

f = open("f.jld", "r") do file

    deserialize(file)

end

[Cristóvão Duarte Sousa]

Hum, nice. Thanks.