Re: dlmread only returns empty matrix

[Gerald Ebberink]

After reading this I think I'll have to checkout either the new octave
or the new octave forge, because my version of dlmread does not accept
more than 3 arguments.

On Tue, 2006-09-12 at 16:35 -0400, Przemek Klosowski wrote:
> You are using dlmread() to skip first three lines, but in that case it
> needs two numbers (row and column of the first number to read).
> Appending a zero argument to your arglist my octave v. 2.9.8 gives:
> 
> F=dlmread('/tmp/test.d',';',3,0)
> F =
> 
>    0   1   5   0   0   0
>    0   2   4   0   0   0
>    0   3   5   0   0   0
>    0   4   0   7   0   0
>    0   5   0   7   0   0
>    0   6   0   7   0   0
> 
> Now, you have some numbers here like 5,68029. Are you using decimal
> comma numeric separator? it may be, because one of the numbers is
> 5,06032 and the leading zero makes more sense in this case. I wonder
> if your locale settings make it work in such case; I tried
> 
>        LC_NUMERIC=',' octave
> 
> wherease getenv("LC_NUMERIC") returned ',' but the values read by
> dlmread didn't change. 
> 
> If the comma is an alternative separator, it's a little more difficult
> because dlmread does not allow regexpressions for the split symbol.
> One way around it would be to re-read the file with a different split
> character: F2=dlmread('/tmp/test.d',',',3,0), or even better, use the
> full range and read it directly into the F array read in the first step:
> 
> F(:,5)=dlmread('/tmp/test.d',',',[3,1,8,2])
> F =
> 
>        0       1       5       0   68029       0
>        0       2       4       0   49062       0
>        0       3       5       0    6032       0
>        0       4       0       7   13333       0
>        0       5       0       7   16667       0
>        0       6       0       7   16667       0
> 
> 
> 
> 
> I have been using  your test file:
> 
> Image Name;ID;Vertical Line;Horizontal Line
>  ; ;Length;Length
>  ; ;mm;mm
> Tv11;1;5,68029;
> Tv11;2;4,49062;
> Tv11;3;5,06032;
> Tv11;4;;7,13333
> Tv11;5;;7,16667
> Tv11;6;;7,16667
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