Re: Question on fscanf ....

[Dr.-Ing. Dieter Jurzitza]

Hello Nicholas,
hello octave - team,
ok, let me try again:

a snipplet of my data - file:

19.03.2020  00.00     30.9322      0.0000    229.0000     74.4911    229.0000   
   
0.0000   -155.8958    259.9323
19.03.2020  00.25     30.3245      0.0000    215.0000     73.6548    215.0000   
   
0.0000   -167.1042    245.3245
19.03.2020  00.50    283.7751      0.0000   1451.3334     71.8259   1451.3334   
   
0.0000   -948.5000   1735.1084
19.03.2020  00.75     20.7556      3.5018    308.4982     65.9915    312.0000   
   
0.0000   -270.6667    329.2538
19.03.2020  01.00     23.7027      2.3038    911.6962     63.4976    914.0000   
   
0.0000   -906.2708    935.3989
19.03.2020  01.25     12.8118      0.0000    198.0000     61.9911    198.0000   
   
0.0000   -156.4792    210.8118
19.03.2020  01.50     28.3770      0.0000    155.0000     61.1548    155.0000   
   
0.0000   -116.6667    183.3770
19.03.2020  01.75     33.9556      0.0000    117.0000     60.1572    117.0000   
   
0.0000      1.7292    150.9556
19.03.2020  02.00     44.0180      0.6392     92.6941     58.9934     93.3333   
   
0.0000    -27.1458    136.7121
19.03.2020  02.25     10.5807     12.8240    119.8427     53.9903    132.6667   
   
0.0000    -91.3750    130.4234

I cannot prevent the linebreak, so the first line should continue after 
229.0000 and go until 259.9323 and so on and so forth. Put this snipplet into 
a file and call it i. e. "data.dat". Call the next "minimalbeispiel.m" with i. 
e. 
minimalbeispiel (data.dat)


This works ok:
function minimalbeispiel (infilename)
  % open infile for reading ....
  infile=fopen(infilename, "r");
  % read data into one array ....
  [Y]=fscanf(infile, "%*s %f %*lf %*f %*f %*f %*f %f %*f %*f", [2 inf]);
  % close infile
  fclose(infile);
  % separate variables ...
  t=Y(1,:)
  y=Y(2,:)
endfunction

Y contains two arrays,  one consisting of the values of column 2 of the file, 
one consisting of the values of column 8 of the file.

My questions:
1.) is there  any way to circumvent the usage of Y and do some kind of
[t,y]=fscanf(infile, "%*s %f %*lf %*f %*f %*f %*f %f %*f %*f", ??????);

2.) the version of fscanf using "C" where I had had put the "??????" now is 
said to be more C-ish. However, I did not find a way to read the data shown 
above into any variable using the "C" statement - only if I would do it in two 
subsequent fscanf - operations assigning one variable at a time.

If some kind soul could provide an information to me - and, moreover, maybe 
let me know how the process would work using "C" at all would be very much 
appreciated. In C-language I would have two pointers to variables sitting 
behind the format - string. But I cannot find a way to do the assignment the 
way I'd like to do it at all. I am sure it is my fault - any help is very much 
appreciated.

Thank you very much for looking into this,
take care

Dieter Jurzitza


Am Freitag, 20. März 2020, 20:39:17 CET schrieb Nicholas Jankowski:
> On Fri, Mar 20, 2020 at 2:56 PM Dr.-Ing. Dieter Jurzitza
> 
> <address@hidden> wrote:
> > Dear listmembers,
> > I've been having a hard time with understanding the format specifiers of
> > fscanf et al - still not fully done, but anyway. Let me provide an example
> > what I'd like to do.
> > 
> > Given you have an ASCII file with 10 columns of data and you're interested
**************

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Dr.-Ing. Dieter Jurzitza                    76131 Karlsruhe