fread's strip.white=TRUE behavior can have similar functions to read.csv()
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 45/100
Research direction
Start by reproducing the issue's fread() and read.csv() examples with sep="," and strip.white=TRUE, then inspect the fread() parsing path for how tabs and surrounding whitespace are handled. Done means fread() matches the stated read.csv() behavior for the shown input, with tests covering the difference.
Written by the indexing model from the issue text.
Description
It is hoped that strip.white=TRUE in the fread() can have similar functions to strip.white=TRUE in read.csv().
For example, when we set sep= ",", spaces and tab are filtered out as spaces in read.csv.
Then in the fread(), tab is preserved in fread().
> all_solution_df <- read.csv(all_solution_file_s, header=FALSE,strip.white=TRUE)
> head(all_solution_df)
V1 V2 V3 V4
1 Model_Term Class Solution StndError
2 Generation.TankID.SexSpec.M2Age2 G00.P11.FNE 0.0 0.0
3 Generation.TankID.SexSpec.M2Age2 G00.P11.M2C 0.0 0.0
4 Generation.TankID.SexSpec.M2Age2 G00.P11.M1C 0.0 0.0
5 Generation.TankID.SexSpec.M2Age2 G00.P11.FCE 0.0 0.0
6 Generation.TankID.SexSpec.M2Age2 G00.P10.FNE 0.0 0.0
> all_solution_dt <- fread(all_solution_file_s, header=FALSE,strip.white=TRUE)
> head(all_solution_dt)
V1 V2 V3 V4
1: Model_Term Class Solution StndError
2: Generation.TankID.SexSpec.M2Age2 \tG00.P11.FNE \t0.0 \t0.0
3: Generation.TankID.SexSpec.M2Age2 \tG00.P11.M2C \t0.0 \t0.0
4: Generation.TankID.SexSpec.M2Age2 \tG00.P11.M1C \t0.0 \t0.0
5: Generation.TankID.SexSpec.M2Age2 \tG00.P11.FCE \t0.0 \t0.0
6: Generation.TankID.SexSpec.M2Age2 \tG00.P10.FNE \t0.0 \t0.0
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