matlab - Why does fopen fail the first time, but work the second time? -

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i using matlab create new file calling 

fid = fopen(filename,'w')

since filename doesn't exist, should create new file , give me valid file descriptor. instead returns -1. if run code again however, fid = 3.

this being run on ubuntu apparently works fine on windows , can't figure out why.

-mike

not sure if helps, note if folder doesn't exist, fopen 'w' can't create file , returns -1.


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