Obtain matrix and column matches

Hi,

I have some data from which I want to obtain some information. However, I ran into some problems for which I will be glad to get expert help.

Data and some information:

A = [1 0 -1 2 0 1;0 2 1 0 1 -2;1 1 0 2 1 1]%matrix
B = [1 3]#rows 1 and 3 are rows for searching.
struc.names = ['blue', 'red', 'green', 'amber', 'grey','yellow']% a structure of column names.
required.names = {'blue', 'green', 'grey','yellow'}; % a structure of required column names

I tried to obtain 3 types of information as follows:

First: Get and save matrix for a subset of rows.

Second: I want to obtain a vector (populated with either 1 or 0) corresponding to columns of interest (required.names) compared to struc.names

Third: For rows 1 and 3, find matches between struc.names and required_rows when row elements are non-zero; also to have result output arranged according to the number of matches.

Problem 1:

 code for getting matrix:

 struc.names = {'blue', 'red', 'green', 'amber', 'grey','yellow'};
 required_rows = [1 3];
 for k = 1:length(required_rows);
  %open file for writing
  fid =fopen('ouput.txt','w');
  idx(k,:) = A(required_rows(k),:);
  fprintf(fid,'%d \n',idx);#print matrix
  end;

output obtained:
1
0
-1
2
0
1 
1
1
0
2
1
1
required output:
1 0 -1 2 0 1 
1 1 0 2 1 1

Problem 2: Obtain column vector for required.names = {'blue', 'green', 'grey','yellow'} when compared with struc.names;

I want to obtain 1(column name present) and 0(column name absent) in a vector like: [1 0 1 0 0 1]; I'm unsure how to write the code.

Problem3: Code for finding matches between struc.names and required_rows when row elements are non-zero and then obtaining sorted results arranged according to number of matches.

 code:
 struc.names = ['blue', 'red', 'green', 'amber', 'grey','yellow']# a structure  of column names.
 required.names = {'blue', 'green', 'grey','yellow'}; # a structure of required  column names

 struc.names = {'blue', 'red', 'green', 'amber', 'grey','yellow'}
 required_rows = [1 3];
 % open file for writing, and Loop
 fid=fopen('file.txt','w+');
 for K = 1 : length(required_rows);
     idx = A(required_rows(K),:) ~= 0;
     if any(idx)
     struc.names = struc.names(idx)
     C = intersect(struc.names ,required_rows)        
     fprintf(fid, 'row A(%d,:) has the following matches:\n');
     fprintf(fid, '%s ', C{idx} );
     fprintf(fid, '\n');
     end
 end
 fclose(fid);

Sorted output (according to number of matches) required as:

 row 3: blue red amber grey yellow
 row 1: blue green amber yellow

Thank you