Candace
Posts:
41
Registered:
10/20/12


Re: matlab version and "for" loops
Posted:
Feb 13, 2013 4:53 PM


dpb <none@non.net> wrote in message <kfdui8$66t$1@speranza.aioe.org>... > On 2/12/2013 10:07 AM, Jessica wrote: > > "Jessica " <jly5@duke.edu> wrote in message > > <ke3bjs$b6t$1@newscl01ah.mathworks.com>... > >> dpb <none@non.net> wrote in message <ke2bbi$98i$1@speranza.aioe.org>... > >> > On 1/26/2013 4:50 PM, Jessica wrote: > >> > > "Jessica " <jly5@duke.edu> wrote in message > >> > > <kdmql8$n4i$1@newscl01ah.mathworks.com>... > >> > >> "Bruno Luong" <b.luong@fogale.findmycountry> wrote in message > >> > >> <kdlt80$st0$1@newscl01ah.mathworks.com>... > >> > ... > >> > > >> > Data(delete) = [] > >> > ... > >> > > > And, one other question. If I want to do the same as above > >> except delete > >> > > based on numbers, how would I do that? If I do: > >> > > > >> > > delete_b = GazeType(GazeType>10) > >> > > > >> > > it only lists the numbers that are greater than 10 and I therefore > >> > > cannot delete those rows. > >> > > Generalize the rule Bruno illustrated > >> > > GazeType(GazeType>10)=[]; > >> > >  > >> > > >> Unfortunately, this won't quite work because I am trying to delete > >> rows within larger data sets: > >> > >> > >> First, I isolate the column I am interested in: > >> > >> RemoveColumn3=Total4(:, 11); > >> > >> Then I wanted to generate a variable (just like I did above when the > >> value was a string), that indicates the rows to be deleted (which are > >> greater than 10). > >> > >> And then, delete those specific rows within 2 datasets: > >> Total4(delete) = [] > >> Target4(delete) = [] > > > > > > I am having some trouble generalizing this logical method. Specifically, > > I am reading in a .csv file and trying to delete "Rows" that have even > > numbers: > > > > Dataset=importdata('020513_No11_WithHeaders.csv'); > > FinalDataSet=Dataset.data; > > FinalDataSet2=Dataset.data; > > Row=Dataset.data(:,5); > > tf=bitget(abs(Row),1)~=0; > > FinalDataSet2(tf)=[]; > > > > However, "FinalDataSet2" is originally sized as 81539x6. When I delete > > the "tf" values, it turns into a variable that is sized as 1x448465. > > > > Can anyone suggest what I am doing incorrectly here? > > Well, when you don't remove elements such that those being removed are > specified as either complete rows or columns the result can't be a > regularly spaced array and so ML returns a vector. > > Given a (short) example dataset that illustrates the input and desired > results. > > Reading the first part literally, to eliminate rows w/ even indices simply > > x(2:2:end,:)=[]; > > does that job. > >  That was a big help thanks for the tip!

