textscan wanted
Locked
 
|
Administrator
|
|
|
|
Administrator
|
|
Administrator
|
On Oct 20, 2010, at 1:55 PM, Ben Abbott wrote:
> On Oct 20, 2010, at 1:39 PM, Dr. Johannes Zellner wrote: > >> 2010/10/20 Ben Abbott <[hidden email]> >> On Oct 20, 2010, at 4:53 AM, Dr. Johannes Zellner wrote: >> >>>> Hi, >>>> >>>> I've a bunch of matlab files which use textscan. >>>> >>>> I don't want to replace all textscan calls with something like fscanf but I'd rather like to have an octave function which implements textscan(). >>>> >>>> Does anyone have a textscan implementation? >>>> >>>> regards, >>>> >>>> -- >>>> Johannes. >>> >>> I've opened a ticket in the bug tracker. >>> >>> https://savannah.gnu.org/bugs/index.php?31380 >>> >>> For now, have you looked at using textread() instead? Unfortunately, textread() is not fully compatible with the ML version. >>> >>> The syntax for ML's textscan is ... >>> >>> C = textscan (fid, 'format') >>> C = textscan (fid, 'format', N) >>> C = textscan (fid, 'format', 'param', value) >>> C = textscan (fid, 'format', N, 'param', value) >>> C = textscan (str, ...) >>> [C, position] = textscan (...) >>> >>> If you don't require the input "N", it should be straight forward to modify scantext() to implement textscan(). A quick fix would support the limited syntax below. >>> >>> C = textscan (fid, 'format') >>> C = textscan (fid, 'format', 'param', value) >>> C = textscan (str, ...) >>> >>> Would that be useful to you? >>> >>> Ben >> >> Ben, >> >> thanks for the quick response. >> It would be more useful, if it would also allow the input parameter N. >> >> regards, > > Ok. Can you provide a simple example with both an input file and a script that uses textscan() with the parameter N to read some data? > > Ben I'd appreciate it if you can try the attached textscan.m and let us know if it works for you. Ben _______________________________________________ Help-octave mailing list [hidden email] https://www-old.cae.wisc.edu/mailman/listinfo/help-octave |
textscan.m (4K) |
|
|
Administrator
|
|
|
Administrator
|
|
Administrator
|
On Oct 21, 2010, at 11:36 AM, Ben Abbott wrote: > On Oct 21, 2010, at 9:52 AM, Liam Groener wrote: > >> On Oct 20, 2010, at 3:03 AM, Ben Abbott wrote: >> >>> On Oct 20, 2010, at 1:55 PM, Ben Abbott wrote: >>> >>>> On Oct 20, 2010, at 1:39 PM, Dr. Johannes Zellner wrote: >>>> >>>>> 2010/10/20 Ben Abbott <[hidden email]> >>>>> On Oct 20, 2010, at 4:53 AM, Dr. Johannes Zellner wrote: >>>>> >>>>>>> Hi, >>>>>>> >>>>>>> I've a bunch of matlab files which use textscan. >>>>>>> >>>>>>> I don't want to replace all textscan calls with something like fscanf but I'd rather like to have an octave function which implements textscan(). >>>>>>> >>>>>>> Does anyone have a textscan implementation? >>>>>>> >>>>>>> regards, >>>>>>> >>>>>>> -- >>>>>>> Johannes. >>>>>> >>>>>> I've opened a ticket in the bug tracker. >>>>>> >>>>>> https://savannah.gnu.org/bugs/index.php?31380 >>>>>> >>>>>> For now, have you looked at using textread() instead? Unfortunately, textread() is not fully compatible with the ML version. >>>>>> >>>>>> The syntax for ML's textscan is ... >>>>>> >>>>>> C = textscan (fid, 'format') >>>>>> C = textscan (fid, 'format', N) >>>>>> C = textscan (fid, 'format', 'param', value) >>>>>> C = textscan (fid, 'format', N, 'param', value) >>>>>> C = textscan (str, ...) >>>>>> [C, position] = textscan (...) >>>>>> >>>>>> If you don't require the input "N", it should be straight forward to modify scantext() to implement textscan(). A quick fix would support the limited syntax below. >>>>>> >>>>>> C = textscan (fid, 'format') >>>>>> C = textscan (fid, 'format', 'param', value) >>>>>> C = textscan (str, ...) >>>>>> >>>>>> Would that be useful to you? >>>>>> >>>>>> Ben >>>>> >>>>> Ben, >>>>> >>>>> thanks for the quick response. >>>>> It would be more useful, if it would also allow the input parameter N. >>>>> >>>>> regards, >>>> >>>> Ok. Can you provide a simple example with both an input file and a script that uses textscan() with the parameter N to read some data? >>>> >>>> Ben >>> >>> I found some simple examples on the web, and made an attempt at implementing the function. >>> >>> I'd appreciate it if you can try the attached textscan.m and let us know if it works for you. >>> >>> Ben >>> >>> <textscan.m> >> >> Hi Ben, >> >> I downloaded the textscan.m and strread.m from your emails and tried the following simple script from a Matlab book using Octave 3.2.3: >> >> B = [30 40 60 70]; >> fid = fopen('myoutput','w'); >> fprintf(fid,'%g miles/hr = %g kilometers/hr\n',[B;8*B/5]); >> fclose(fid); >> >> fopen('myoutput','r'); >> X = fscanf(fid,'%f miles/hr = %f kilometers/hr') >> C = textscan(fid,'%f miles/hr = %f kilometers/hr') >> fclose(fid); >> >> This was the output: >> >> X = >> >> 30 >> 48 >> 40 >> 64 >> 60 >> 96 >> 70 >> 112 >> >> error: A(I): Index exceeds matrix dimension. >> error: called from: >> error: /Users/liamg/mFiles/textscan.m at line 60, column 3 >> error: /Users/liamg/mFiles/tst.m at line 8, column 3 >> >> The file "myoutput" was written correctly. >> >> Liam > > > I tried the example above in Matlab. The result for C was ... > > C = [0x1 double] [0x1 double] > > If I commend out "X = fscan (...)" then I get > > C = [4x1 double] [4x1 double] > >>> C{1} > > ans = > > 30 > 40 > 60 > 70 > >>> C{2} > > ans = > > 48 > 64 > 96 > 112 > > I modified the example as ... > > B = [30 40 60 70]; > fid = fopen ('myoutput','w'); > fmt = '%g miles/hr = %g kilometers/hr\n'; > str = sprintf (fmt, [B;8*B/5]); > fprintf (fid, '%s', str); > fclose (fid); > > fopen ('myoutput','r'); > fmt = '%f miles/hr = %f kilometers/hr'; > C = textscan (fid, fmt); > fclose (fid); > > c = cell (1, 2); > [c{:}] = strread (str, fmt); > > With ML, both textscan() and strread() give the same result. > >> From that I infer that the problem is with strread(). I'll take a look at fixing that. > > Ben If the format includes regular expressions then these won't work. Otherwise, the should be ok. If no problems are found, I'll move this thread to the developers list. Ben _______________________________________________ Help-octave mailing list [hidden email] https://www-old.cae.wisc.edu/mailman/listinfo/help-octave |
|
|
Loading...
| Powered by Nabble | Edit this page |