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Thread Subject: Writing a column vector to file

Subject: Writing a column vector to file

From: Felipe Sediles

Date: 27 Sep, 2007 19:22:45

Message: 1 of 2

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Hi, I'm trying to take an N-element column vector and write
it in a particular format. I want to write it as a
comma-separated, 16-column, set, but N isn't necessarily
divisible by 16. How would I got about doing this using
fprintf?

Subject: Writing a column vector to file

From: Jos

Date: 27 Sep, 2007 19:40:42

Message: 2 of 2

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"Felipe Sediles" <felipe.sediles.nospam@mathworks.com>
wrote in message <fdgvu5$pc4$1@fred.mathworks.com>...
> Hi, I'm trying to take an N-element column vector and
write
> it in a particular format. I want to write it as a
> comma-separated, 16-column, set, but N isn't necessarily
> divisible by 16. How would I got about doing this using
> fprintf?

One of the many solution:

% example data
A = 1:7 ;
n = 2 ; % number of required columns

% step 1: convert to single string
  fmt = repmat('%f,',1,n) ;
  S = sprintf([fmt(1:end-1) '\n'],A) ;
% step 1+ : remove a possible trailing comma
  if rem(numel(A),n), S = S(1:end-1) ; end

% step 2: write to a file as a single string
  fid = fopen('dummy.txt','wt') ;
  fprintf(fid,'%s',S) ;
  fclose(fid) ;

% show the result
  type dummy.txt

hth
Jos

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fprintf	Felipe Sediles	27 Sep, 2007 15:25:03

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