Thanks. It works now.
गुरुवार, 9 अप्रैल 2015 को 7:27:05 अपर UTC+5:30 को, Jameson ने लिखा:
>
> Since you opened the file with read-only access ("r" instead of "r+"),
> attempting to write to the file (through the mmap array) is an error.
> On Thu, Apr 9, 2015 at 9:15 AM Maco Anshu <[email protected]
> <javascript:>> wrote:
>
>> Hi,
>> I am trying to reproduce an algorithm http://arxiv.org/abs/1312.5542 in
>> Julia. Since the array for which I want to find the Principle Components
>> for is huge, I would need to use it as a memory mapped as many discussions
>> in the mailing list point out.
>> However when I try to perform any set operation on mmap_array I get an
>> error. Its a different error on Windows/Linux. My question is whether the
>> mmap_array implementation is read-only or is it some mistake in my usage ?
>>
>> julia> s = open("data","r")
>> IOStream(<file data>)
>>
>> julia> A = mmap_array(Float64,(4,5),s)
>> 4x5 Array{Float64,2}:
>> 1.97626e-323 0.0 0.0 0.0 0.0
>> 2.47033e-323 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
>>
>> julia> A[2,3]
>> 0.0
>>
>> julia> A[2,3] = 5.6
>> ERROR: MemoryError()
>> in setindex! at array.jl:308
>>
>> One thread here points to close s before I use mmap_array so I tried that
>> too
>>
>> julia> close(s)
>>
>> julia> A[2,3] = 5.6
>> ERROR: MemoryError()
>> in setindex! at array.jl:308
>>
>> Thanks a lot,
>> Maco
>>
>
