help: formatting matlab vectors/columns with fprintf

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2 total messages Started by Rob Thieler Thu, 01 Sep 1994 14:29

#161

Author: Rob Thieler
Date: Thu, 01 Sep 1994 14:29

39 lines
2318 bytes

Greetings. I've got a little problem in matlab 4.1.1 that's driving me
nuts. Recourse to the manual and the FAQ hasn't helped.

I have a matrix called L12_030794_bathy_corr. It looks like:

>> size(L12_030794_bathy_corr)

ans =

   864     9

I want to save this as an ascii file called "L12_030794_bathy_corr.dat"
using a printf of the form

'%.6f\t%.6f\t%.1f\t%02.0f\t%02.0f\t%02.0f\t%06.4f\t%.8f\t%.1f\n'

where each %.Xf refers to the desired format of vectors/columns 1-9 in
the matrix.

So far, my attempts have met with spectacular failure. I
get a flat file of the data in the each column formatted according to
each of the nine specs in serial fashion. I must be doing something
dumb here.  I'm assuming that this command would behave like a printf
in C or awk (i.e., print each row using format #1 for $1, #2 for $2,
etc.) but obviously this is not the case. Can someone help me out?

The commands I've been using are:

fid = fopen('L12_030794_bathy_corr.dat','w');

fprintf(fid,'%.6f\t%.6f\t%.1f\t%02.0f\t%02.0f\t%02.0f\t%06.4f\t%.8f\t%.1
f\n', L12_030794_bathy_corr);

Thanks in advance,

Rob Thieler                               | rthieler@rogue.geo.duke.edu
Duke University, Department of Geology    |         Tel: (919) 681-8228
Pgm for the Study of Developed Shorelines |         Fax: (919) 684-5833
Durham, NC  27708-0228                    |

Re: help: formatting matlab vectors/columns with fprintf

#162

Author: Cleve Moler
Date: Thu, 01 Sep 1994 19:34

35 lines
1740 bytes

In article <344ofl$970@news.duke.edu>,
Rob Thieler <rthieler@rogue.geo.duke.edu> wrote:
>Greetings. I've got a little problem in matlab 4.1.1 that's driving me
>nuts. ...
>
>The commands I've been using are:
>
>fid = fopen('L12_030794_bathy_corr.dat','w');
>
>fprintf(fid,'%.6f\t%.6f\t%.1f\t%02.0f\t%02.0f\t%02.0f\t%06.4f\t%.8f\t%.1
>f\n', L12_030794_bathy_corr);
>
>Rob Thieler

Hi

I think all you need to add is one apostrophe to transpose your matrix:

 fprintf(fid,'%.6f\t... \n', L12...corr');
                                       ^--   that's it, there.

When you say

 fprintf(fid,'format',A)

the matrix A is sent to the print routine column by column, just
like A(:).  The format is used over and over again until all the data
has been processed.  Since you are thinking of the format as 
describing a row, not a column, use

 fprintf(fid,'format',A')

Hope this is what you were after.

  -- Cleve Moler

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