great, thanks for the replies. The reason I asked is that the book gives detailed pedal marks for most of the other pieces, so I was surprised that there were no marking for this particular piece. The picture I'm getting is that mostly the use of the pedal comes down to personal taste and interpretation a lot of the time. I suppose it also depends on how stricly you want to stick to the composers intentions for the piece. I wonder, did Chopin indicate pedal marks in his original manuscripts or are these markings that have been added by various editors over time ?
Editors can sometimes add pedal marks if they think a section should be pedaled a certain way, but not even the editors' additions will account for all the pedal you will be using and when to change it.
However, if you have an Urtext edition of Chopin it usually means it is edited from his original score and/or the first editions after Chopin's corrections, including his original pedal marks.
Keep in mind, though, that the pedal was less "effective" in Chopins time, ie the notes didn't resonate as long, so it will usually not be possible to pedal as Chopin intended on a modern piano anyway. Passages will sound too blurry, etc. You'll have to change the pedal several times rather than holding it for the duration Chopin indicated in many cases.