Os x man fwrite api

fwrite text

The idea being that if milli and microseconds are present then you most likely want to retain them. The first three options are fast due to new specialized C code. R's internal UTC representation is written faithfully to encourage ISO standards, stymie timezone ambiguity and for speed.

This is new functionality as of Nov The file position indicator of the new stream is set to that belonging to fd, and the error and end-of-file indicators are cleared.

Fread

In speaking, writing and in code comments we may refer to sep2[2] as simply "sep2". The stream is positioned at the beginning of the file. The default is chosen to visually distinguish from the default sep. We may be able to support one or two more specific options if required. Cannot be the same as sep. All other column types including Date, IDate and ITime which are independent of timezone are written as the "ISO" option using fast C code which is already consistent with write. Therefore it is good practice and indeed sometimes necessary under Linux to put an fseek 3 or fgetpos 3 operation between write and read operations on such a stream. The mode string can also include the letter 'b' either as a last character or as a character between the characters in any of the two- character strings described above. Experiment to see what works best for your data on your hardware. Note that ANSI C requires that a file positioning function intervene between output and input, unless an input operation encounters end-of-file. Output is always appended to the end of the file. Default is ",". You should not be able to notice any difference in write speed between those three options. See link in references.

Cannot be the same as sep. Name change for consistency with 'fread' for which 'logicalAsInt' would not make sense. Details fwrite began as a community contribution with pull request by Otto Seiskari. Accordingly this can be slow. The file descriptor is not dup'ed, and will be closed when the stream created by fdopen is closed.

The fopenfdopen and freopen functions may also fail and set errno for any of the errors specified for the routine malloc 3. Old name for 'logical01'.

fclose

Therefore it is good practice and indeed sometimes necessary under Linux to put an fseek 3 or fgetpos 3 operation between write and read operations on such a stream. All other column types including Date, IDate and ITime which are independent of timezone are written as the "ISO" option using fast C code which is already consistent with write.

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