SystemError:opening file Tensor1.txt: No such file or Directory

New to Julia
1

Hi guys, I’m trying to execute a script file, but I got a message of SystemError:opening file Tensor1.txt: No such file or Directory. Actually the file Tensor1.txt is there inside the same folder. I can’t figure out why Julia 0.6.4 is not reading the file. I’m running this script file on Atom 1.29.

The code is:


# MDP problem description

# Get transition matrices
Tensor = Dict()
Tensor["1"] = readdlm("Tensor1.txt")
Tensor["2"] = readdlm("Tensor2.txt")

# Get reward function
Rewards = Dict()
Rewards["1"]   = readdlm("Rewards1.txt")
Rewards["2"]   = readdlm("Rewards2.txt")

# State space description
States = Dict()
States["#states"]  = size(Tensor["1"],1)
States["FeatSize"] = [2,162]

Actions = Dict()
Actions["#actions"] = 2

Constraints = Dict()
Constraints["#constraints"] = 1
Constraints["States"] = [52]

# Initial condition
init = 1
λ = 0.7

VXpolicy = CMDP(States,Actions,
                Tensor,Rewards,
                λ,init,zeros(3),Constraints)

(Values,Policy) = SolveCMDP(VXpolicy);

TotalStates = States["#states"]

MC = zeros(TotalStates,TotalStates)

for i = 1:TotalStates
   ind = Policy[i]
   MC[i,:] =  Tensor["$(ind)"][i,:]
end
``



``` LoadError: e[91mSystemError: opening file Tensor1.txt: No such file or directorye[39m
while loading /Users/marcelord12/Documents/phd2018/mppo/thesis/MDP/LP/Sample.jl, in expression starting on line 7
#systemerror#44 at error.jl:64 [inlined]
systemerror(::String, ::Bool) at error.jl:64
open(::String, ::Bool, ::Bool, ::Bool, ::Bool, ::Bool) at iostream.jl:104
open(::Base.#readstring, ::String) at iostream.jl:150
#readdlm_auto#11(::Array{Any,1}, ::Function, ::String, ::Char, ::Type{T} where T, ::Char, ::Bool) at datafmt.jl:134
#readdlm#7 at datafmt.jl:81 [inlined]
readdlm(::String, ::Char, ::Char) at datafmt.jl:81
#readdlm#5(::Array{Any,1}, ::Function, ::String) at datafmt.jl:64
readdlm(::String) at datafmt.jl:64
include_string(::String, ::String) at loading.jl:522
include_string(::Module, ::String, ::String) at Compat.jl:88
(::Atom.##112#116{String,String})() at eval.jl:109
withpath(::Atom.##112#116{String,String}, ::String) at utils.jl:30
withpath(::Function, ::String) at eval.jl:38
hideprompt(::Atom.##111#115{String,String}) at repl.jl:67
macro expansion at eval.jl:106 [inlined]
(::Atom.##110#114{Dict{String,Any}})() at task.jl:80```
2

I think julia-0.6 looks up that file in the current working directory (pwd()) not in the /Users/marcelord12/Documents/phd2018/mppo/thesis/MDP/LP/ .

Which folder do you mean?

3

Thanks, but I was runing the .jl script file code in the same directory where I saved Tensor1.txt. I thought that is the Current Directory.

What shall I do to fix the error?

4

You can put pwd() at the begining of jl file to see current directory. Maybe use absolute path if julia confuses which folder it should load the file?

5

I tried this

~$ cat > test.txt
LTMS
^C
~$ cat > Projects/Julia/trial.jl
pwd()   
f=open("test.txt","r+")  
t = readlines(f)   
close(f)   
^C
~$ julia

julia> include("Projects/Julia/trial.jl")

julia> t
1-element Array{String,1}:
 "LTMS"

...

~$ mv test.txt Projects/Julia/test.txt
~$ julia

julia> include("Projects/Julia/trial.jl")
ERROR: LoadError: SystemError: opening file test.txt: No such file or directory
Stacktrace:
 [1] #systemerror#39(::Nothing, ::Function, ::String, ::Bool) at ./error.jl:106
 [2] systemerror at ./error.jl:106 [inlined]
 [3] #open#297(::Bool, ::Bool, ::Nothing, ::Nothing, ::Nothing, ::Function, ::String) at ./iostream.jl:283
 [4] #open at ./none:0 [inlined]
 [5] open(::String, ::String) at ./iostream.jl:339
 [6] top-level scope at none:0
 [7] include at ./boot.jl:317 [inlined]
 [8] include_relative(::Module, ::String) at ./loading.jl:1038
 [9] include(::Module, ::String) at ./sysimg.jl:29
 [10] include(::String) at ./client.jl:398
 [11] top-level scope at none:0
in expression starting at ~/Projects/Julia/trial.jl:2
6

Current directory is by default the directory from which you start Julia. If you want to find a file in the same directory as a file you load, @__DIR__ is probably what you look for. Try

f = open(joinpath(@__DIR__, "test.txt"), "r+")

in your test script.

7

Thanks> I think it has worked. But I got an unexpected error:
WARNING: Problem status UnknownError; solution may be inaccurate.