It is possible :) I work with DNA sequences, there could be millions of common SNPs in a genome.
Cheers, Hernán 2015-01-26 3:33 GMT-03:00 Sven Van Caekenberghe <s...@stfx.eu>: > > > On 26 Jan 2015, at 06:32, Hernán Morales Durand < > hernan.mora...@gmail.com> wrote: > > > > > > > > 2015-01-23 18:00 GMT-03:00 Sven Van Caekenberghe <s...@stfx.eu>: > > > > > On 23 Jan 2015, at 20:53, Hernán Morales Durand < > hernan.mora...@gmail.com> wrote: > > > > > > Hi Sven, > > > > > > 2015-01-23 16:06 GMT-03:00 Sven Van Caekenberghe <s...@stfx.eu>: > > > Hi Hernán, > > > > > > > On 23 Jan 2015, at 19:50, Hernán Morales Durand < > hernan.mora...@gmail.com> wrote: > > > > > > > > I used to use a CSV parser from Squeak where I could attach > conditional iterations: > > > > > > > > csvParser rowsSkipFirst: 2 do: [: row | " some action ignoring first > 2 fields on each row " ]. > > > > csvParser rowsSkipLast: 2 do: [: row | " some action ignoring last 2 > fields on each row " ]. > > > > > > With NeoCSVParser you can describe how each field is read and > converted, using the same mechanism you can ignore fields. Have a look at > the senders of #addIgnoredField from the unit tests. > > > > > > > > > I am trying to understand the implementation, I see you included > #addIgnoredFields: for consecutive fields in > Neo-CSV-Core-SvenVanCaekenberghe.21 > > > A question about usage then, adding ignored field(s) requires adding > field types on all other remaining fields? > > > > Yes, like this: > > > > testReadWithIgnoredField > > | input | > > input := (String crlf join: #( '1,2,a,3' '1,2,b,3' '1,2,c,3' > '')). > > self > > assert: ((NeoCSVReader on: input readStream) > > addIntegerField; > > addIntegerField; > > addIgnoredField; > > addIntegerField; > > upToEnd) > > equals: { > > #(1 2 3). > > #(1 2 3). > > #(1 2 3).} > > > > > > > > May be you like to know if you make a pass to NeoCSV, for some data sets > I have 1 million of columns, it would be nice an addFieldsInterval: or such. > > 1 million columns ? How is that possible, useful ? > > The reader is like a builder. You could try to do this yourself by writing > a little loop or two. > > But still, 1 million ? > > > Thank you. > > > > Hernán > > > > >