fread for complex input
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Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 35/100
Research direction
Review the related discussions in #3690 and #4464, then inspect parse_double_regular_core in fread.c and the Rcomplex handling in freadR.c. Determine how complex values should be stored and how type auto-detection affects the sample scan; done means fread can recognize and return complex columns without an unacceptable efficiency cost.
Written by the indexing model from the issue text.
Description
Follow-up to #3690 and #4464.
Originally I said it would take significant effort but #4464 would make adding a parser for complex straightforward -- parse_double_regular_core followed by + or -, then parse_double_regular_core followed by i. The only complication is about storage -- fread.c returns a struct and freadR.c applies Rcomplex?
It also raises a question of efficiency -- how much of an impact does it have to add auto-detect types? Since plain numeric and complex columns look identical for 10-15 characters (maybe), it could be inefficient to offer this "lookalike" parser. OTOH it's only applied to a small sample of rows.
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- R
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- Merged PRs (30d)
- 4
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