MATLAB Central Newsreader - Can you do this with load?

Can you do this with load?

David Doria — Tue, 27 May 2008 13:07:02 -0400

I have a file like this

1 2 3
1 2 3 4 5 6
1 2 3 4 5 6
1 2 3 4 5 6
1 2 3 4 5 6
(etc. 1000's of lines like the previous)

where the first line is shorter than the rest.

Is there a way with load() to say "Its ok, just fill in NaN
for the missing numbers? It just seems better to read this
file with load instead of writing a loop and using fscanf.

Thoughts?

Thanks,

Dave

Re: Can you do this with load?

us — Tue, 27 May 2008 13:21:01 -0400

"David Doria":
<SNIP simple text reader...

> I have a file like this
> 1 2 3
> 1 2 3 4 5 6
> 1 2 3 4 5 6
> 1 2 3 4 5 6
> 1 2 3 4 5 6

one of the solutions

     fnam='foo.txt'; % your file name...
     nc=6;
     fmt=repmat('%n',1,nc);
     clear m;
     [m{1:nc}]=textread(fnam,fmt,'emptyvalue',nan);
     m=cat(2,m{:});
     disp(m)
%{
     1 2 3 NaN NaN NaN
     1 2 3 4 5 6
     1 2 3 4 5 6
     1 2 3 4 5 6
     1 2 3 4 5 6
%}

us

Re: Can you do this with load?

David Doria — Tue, 27 May 2008 13:45:02 -0400

WOW!!! It went from 150 seconds to 0.45 seconds to read the
file!!!

What does textread do that makes it so fast? This is MUCH
faster than even reading the file in c++!!