Re: automation and for loops

[Jonas Amhest]

nevermind, I got it!

thank you for you help though. 

i immensely appreciate it. now i can finish up the rest of this...

--Mike

--- On Wed, 6/24/09, James Sherman Jr. <address@hidden> wrote:

> From: James Sherman Jr. <address@hidden>
> Subject: Re: automation and for loops
> To: "Jonas Amhest" <address@hidden>
> Cc: "octave" <address@hidden>
> Date: Wednesday, June 24, 2009, 10:24 PM
> Instead of modifying the code that
> works, I'd break it off into a separate function that
> accepts a filename and returns the data variable. 
> Something like:
> 
> in file called read_data_file.m:
> 
> function data = read_data_file(filename)
> 
> data = [];
> 
> fid = fopen(filename);
> 
> <rest of your function>
> return;
> 
> then you can just call this function in your for loop:
> 
> files=dir('*.txt');
> 
> for i=1:length(files)
> 
>         all_data{i} = read_data_file(files(i).name);
> 
> end
> 
> where all_data is called a cell array.  Basically, you can
> treat it like a normal array when accessing elements just
> use {} instead of ().
> 
> Hope this helps.
> 
> On Wed, Jun 24, 2009 at 6:07 PM,
> Jonas Amhest <address@hidden>
> wrote:
> 
> 
> 
> hi all,
> 
> 
> 
> i'm using octave 3.2 on windows xp.
> 
> i have a lot of files i need to load and save, but it has
> to be automated.
> 
> the files have headers, data, and footers. i know how to
> open these but i want to incorporate a loop where the file
> is loaded and saved to a separate file or even just have the
> data saved to a separate variable through each loop.
> 
> 
> 
> 
> here're are two example files:
> 
> 
> 
> new00.txt
> 
> 
> 
> asdf
> 
> asdf
> 
> 1385.00 5585
> 
> 2446.34 95456.74
> 
> 3234.35 2343456.04
> 
> 4564    53456345
> 
> 5797    83456
> 
> asdf
> 
> 
> 
> 
> 
> and
> 
> 
> 
> new01.txt
> 
> 
> 
> 
> 
> asdf
> 
> asdf
> 
> 1385.00 5585
> 
> 2446.34 95456.74
> 
> 3234.35 2343456..04
> 
> 4564    53456345
> 
> 5797    83456
> 
> asdf
> 
> 
> 
> 
> 
> to open the files i'm using this code so that it skips
> the headers and footers and makes a matrix out of my data:
> 
> 
> 
> data = [];
> 
> fid = fopen('ref00.txt');
> 
> line_string = fgetl(fid);   # reads one line of the file
> into a string
> 
> while (line_string != -1)   # makes sure its not eof
> 
>   [line_data, count] = sscanf(line_string, '%f
> %f');  # tries to parse string; f=decimal notation
> 
>   if (count == 2)   # if its successful (finds 2
> integers)
> 
>     data = [data;line_data'];   # append it to your
> data variable
> 
>   end
> 
>   line_string = fgetl(fid);
> 
> end
> 
> fclose(fid);
> 
> 
> 
> 
> 
> my matrix is saved into the variable data. i was trying to
> put the code above into a for loop that saves new00.txt into
> 'data00' and new01.txt into 'data01'
> 
> based off of this code:
> 
> 
> 
> files=dir('*.txt');
> 
> for i=1:length(files)
> 
>         eval(['load ' files(i).name '
> -ascii']);
> 
> end
> 
> 
> 
> 
> 
> 
> 
> my attempt at this was:
> 
> 
> 
> for i=1:length(files)
> 
> fid = fopen(files);
> 
> line_string = fgetl(fid);   # reads one line of the file
> into a string
> 
> while (line_string != -1)   # makes sure its not eof
> 
>   [line_data, count] = sscanf(line_string, '%f
> %f');  # tries to parse string; f=decimal notation
> 
>   if (count == 2)   # if its successful (finds 2
> integers)
> 
>     data(i) = [data;line_data'];   # append it to
> your data variable
> 
>   end
> 
>   line_string = fgetl(fid);
> 
> end
> 
> fclose(fid);
> 
> end
> 
> 
> 
> but i keep getting an error about double_value () : :wrong
> type argument 'struct'
> 
> 
> 
> 
> 
> 
> 
> any help is greatly appreciated!
> 
> 
> 
> -Mike
> 
> 
> 
> 
> 
> 
> 
> 
> 
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