[Octave-patch-tracker] [patch #8783] C++ implementation of textscan

[Philip Nienhuis]

Follow-up Comment #76, patch #8783 (project octave):

Lachlan,

It's just that to use textscan.cc as backend for strread.m and textread.m,
absence/presence of a trailing EOL matters.

Matlab (at least r2016a prerelease) gives:
w>> format compact
>> textscan (['1 2' char(10) '3'], '%d %f')
ans = 
    [2x1 int32]    [2]

>> textscan (['1 2' char(10) '3' char(10)], '%d %f')
ans = 
    [2x1 int32]    [2x1 double]

>> textscan (['1 2 3' char(10)], '%d %f')
ans = 
    [2x1 int32]    [2x1 double]

>> textscan (['1 2 3'], '%d %f')
ans = 
    [2x1 int32]    [2]
>> 

Similarly when reading from file:

>> fid1 = fopen ('txtscn.dat')
fid1 =
     3

>> C = textscan (fid1, '%d %d')
C = 
    [2x1 int32]    [2]
>> fclose (fid1);

>> fid2 = fopen ('txtscn2.dat')
fid2 =
     3
>> C = textscan (fid2, '%d %d')
C = 
    [2x1 int32]    [2x1 int32]
>> 


where txtscn.dat contains "1 2\n3" and txtscn2.dat "1 2\n3\n".

This behavior is the same as that of Matlab's strread:

>> [a, b] = strread ('1 2 3', '%d %d')
a =
     1
     3
b =
     2
>> [a, b] = strread (['1 2 3' char(10)], '%d %d')
a =
     1
     3
b =
     2
     0
%% note int32 has no NaN so here we get 0
>> [a, b] = strread (['1 2' char(10) '3'], '%d %d')
a =
     1
     3
b =
     2
>> [a, b] = strread (['1 2' char(10) '3' char(10)], '%d %d')
a =
     1
     3
b =
     2
     0>>



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