Example of how to write line by line to a CSV file in Julia?

[yaois...@gmail.com]

Hi Guys,

I'm struggling to find some examples regarding how to write line by line to a CSV file. Scouring the documentation, I have been able to come across this so far: http://julia-cn.readthedocs.org/en/latest/stdlib/base/?highlight=writecsv
So I currently have a function that is part of a for loop that outputs some data in each iteration.
In pseudocode, here is what I want to do:

for i in 1:2000
    y1,y2,y3 = f(i)
    ysavetuple = y1,y2,y3
    writecsv("ysavetuple.csv",ysavetuple)

However, I am not sure how to go about saving line by line, separating the tuple into individual cells under labeled column headers.

Any guidance would be appreciated.

Thanks,
Wally

[Leah Hanson]

Is this what you're looking for?

~~~

julia> csvfile = open("ysavetuple.csv","w")

IOStream(<file ysavetuple.csv>)

julia> write(csvfile,"ColName A, ColName B, ColName C\n")

32

julia> foo(i) = tuple(rand(Int,3)...)

foo (generic function with 1 method)

julia> for i = 1:20

         y1,y2,y3 = foo(i)

         ysavetuple = y1, y2, y3

         write(csvfile, join(ysavetuple,","), "\n")

       end

julia> close(csvfile)

shell> cat ysavetuple.csv

ColName A, ColName B, ColName C

3341065172693628568,2785375663699326345,3139303717694603190

6079317564046002747,-9078602496166771942,316842938125726587

-3417130537836373451,-2125006311387038993,7377203727928183519

8358027301276313215,-550007455247301253,4550810412861259284

6923216407498203989,-6554142179327706075,-7691369716492508716

-1686152429396775777,8749188497040439214,-7530985225065041867

-1703823086470161742,8611509687251940012,4568676596067050636

5799892753953213008,3071911357874547504,-5404969669875969538

-2454300728611454039,6075726156412295188,-2730595046142414415

-4745225085034107111,6326943245021453770,-1335744683672406184

-8241065834050575249,9081437527204936820,-5382908887176747766

3809111146841985672,8705023102801762616,-7272701245961853612

8636161548674726627,5531655905953625247,-2539551872166338494

-1075777440989646159,1220494169889323606,3141159378055978579

2137393503615038568,-1785476893677818827,-411925966250929747

-5315012022696729804,858923725586425906,-7987423971277696135

3115970830776320266,6147819354500740390,-9153883089584687671

-5801765622147987138,-6846434057707600414,-850327360071980009

-4113725585379526907,5602712312389731368,2811295763696425064

-1191524940193068432,-3389508986455397789,2511100231858228670

~~~

-- Leah

[yaois...@gmail.com]

Leah, thank you for saving the day again.

Regards,
Wally

[Jacob Quinn]

Sounds like you should change your email to leahis...@gmail.com! :)