how can i randomly sample from a matrix and determine the remaining part?

i have a matrix (D) having 343 rows and 7 columns and i want to sample randomly the 30% of the data and determine the remaining 70% (no randomly). I wrote this code for randomly sample the 30% but i don't know how determine the rest.

perc =30; %percentual
n = round(343*perc/100); % number of rows associated to 30% of data 
c=randperm(length(D),n); 
D1=D(c,:) %output matrix

Answer 1

[Bruno Luong]

D2=D(setdiff(1:end,c),:)

or

b = ~logical(accumarray(c(:),1,[size(D,1) 1]));
D2 = D(b,:);

or

b = true([size(D,1) 1]);
b(c) = false;
D2 = D(b,:);

[EM geo]

really thank you Bruno!!!