MATLAB Central Newsreader - dlmwrite help!

dlmwrite help!

lauren_g — Thu, 08 May 2008 14:38:01 -0400

Hi,

I am a matlab novice so please excuse me if my question is silly!

I have a variable I am trying to save as an ASCII. The variable is double precision and each case only takes one of two values. I initially created this variable with each case taking either the value of '0' or '255' (for imagery purposes). I saved it using the following command which worked fine:

dlmwrite('name.asc',E,'delimiter','\t','precision','%.0f')

However, the program I wish to import the ASCII into needs the values to be between 0 and 9 (the actual values do not matter, so long as they are single digits). When I have tried creating the variable so all cases have single digit values (e.g. all '0' or '1', or all '8' and '9') and saved this using the same command as above the ASCII created does not contain any numeric values - just boxes!

Does anyone know why this is?

many thanks

Lauren

Re: dlmwrite help!

dpb — Thu, 08 May 2008 18:01:31 -0400

lauren_g wrote:
...
> I have a variable I am trying to save as an ASCII. The variable is
> double precision and each case only takes one of two values. I
> initially created this variable with each case taking either the
> value of '0' or '255' (for imagery purposes). I saved it using the
> following command which worked fine: >
> dlmwrite('name.asc',E,'delimiter','\t','precision','%.0f')
>
> However, the program I wish to import the ASCII into needs the values
> to be between 0 and 9 (the actual values do not matter, so long as they
> are single digits). When I have tried creating the variable so all cases
> have single digit values (e.g. all '0' or '1', or all '8' and '9') and
> saved this using the same command as above the ASCII created does not
> contain any numeric values - just boxes!
...

W/O specific code to look at, not precisely, no.

But, the following worked fine for me...

>> x = rand(10,1) % get some arbitrary data
x =
     0.0153
     0.7468
     0.4451
     0.9318
     0.4660
     0.4186
     0.8462
     0.5252
     0.2026
     0.6721
>> x(x>0.5)=1; x(x<=0.5)=0 % make it bi-valued
x =
      0
      1
      0
      1
      0
      0
      1
      1
      0
      1
>> dlmwrite('test.dat',x, '\t') % output it
>> type 'test.dat' % check it's what wanted
0
1
0
1
0
0
1
1
0
1

I'm stuck in a time-warp w/ Matlab R12 so don't have the alternate
optional arguments to dlmwrite later versions have, but you don't need
them for this purpose anyway.

--

>>

Re: dlmwrite help!

Barry Williams — Thu, 08 May 2008 19:00:25 -0400

I'm not sure that I've got the answer to your question,
but here's a bit more info that may make the problem
murkier.

How are you looking at the file you create? When I open
it in Notepad, all I see are boxes. When I save to
name.txt (with everything else left the same as you wrote
it) and either type name.txt in MatLab or open in Excel, I
see the single integers values that I have wrriten to
name.txt.

Barry

lauren_g <lgxlg1@nottingham.ac.uk> wrote in message
<21483080.1210257689268.JavaMail.jakarta@nitrogen.mathforum
.org>...
> Hi,
>
> I am a matlab novice so please excuse me if my question
is silly!
>
> I have a variable I am trying to save as an ASCII. The
variable is double precision and each case only takes one
of two values. I initially created this variable with
each case taking either the value of '0' or '255' (for
imagery purposes). I saved it using the following command
which worked fine:
>
> dlmwrite
('name.asc',E,'delimiter','\t','precision','%.0f')
>
> However, the program I wish to import the ASCII into
needs the values to be between 0 and 9 (the actual values
do not matter, so long as they are single digits). When I
have tried creating the variable so all cases have single
digit values (e.g. all '0' or '1', or all '8' and '9') and
saved this using the same command as above the ASCII
created does not contain any numeric values - just boxes!
>
> Does anyone know why this is?
>
> many thanks
>
> Lauren