[Octave-bug-tracker] [bug #51412] strcmp with multidimensional char arrays

[Nicholas Jankowski]

Follow-up Comment #10, bug #51412 (project octave):

just providing an update with octave 8.0.1 (hg id: 24bd675bceab) and matlab
2022b:

no change in the comment #0 response except the 2D case in Octave now gives a
warning:

"warning: multi-row character matrix converted to a string, only the first row
is used"


adding in the Matlab behavior with string arrays:


%1D array
>> a = string('abc')
a = 
    "abc"
>> strcmp(a,a)
ans =
  logical
   1
>> strcmp(a,{a})
ans =
  logical
   0
>> strcmp({a},{a})
ans =
  logical
   0
>> strcmp(a,{a,a})
ans =
  1×2 logical array
   0   0
>> strcmp({a},{a,a})
ans =
  1×2 logical array
   0   0
>> a = ["abc","def"]
a = 
  1×2 string array
    "abc"    "def"
>> strcmp(a,a)
ans =
  1×2 logical array
   1   1
>> strcmp(a,{a})
ans =
  1×2 logical array
   0   0
>> strcmp({a},{a})
ans =
  logical
   0
>> strcmp(a,{a,a})
ans =
  1×2 logical array
   0   0
>> strcmp({a},{a,a})
ans =
  1×2 logical array
   0   0

%2D array
>> a = ["abc","def"; "ghi", "jkl"]
a = 
  2×2 string array
    "abc"    "def"
    "ghi"    "jkl"
>> strcmp(a,a)
ans =
  2×2 logical array
   1   1
   1   1
>> strcmp({a},{a})
ans =
  logical
   0
>> strcmp(a,{a,a})
Error using strcmp
Inputs must be the same size or either one can be a scalar. 
>> strcmp({a},{a,a})
ans =
  1×2 logical array
   0   0

%3D array
>> a = cat(3,a,a)
  2×2×2 string array
a(:,:,1) = 
    "abc"    "def"
    "ghi"    "jkl"
a(:,:,2) = 
    "abc"    "def"
    "ghi"    "jkl"
>> strcmp(a,a)
  2×2×2 logical array
ans(:,:,1) =
   1   1
   1   1
ans(:,:,2) =
   1   1
   1   1
>> strcmp(a,{a})
  2×2×2 logical array
ans(:,:,1) =
   0   0
   0   0
ans(:,:,2) =
   0   0
   0   0
>> strcmp({a},{a})
ans =
  logical
   0
>> strcmp(a,{a,a})
Error using strcmp
Inputs must be the same size or either one can be a scalar. 
>> strcmp({a},{a,a})
ans =
  1×2 logical array
   0   0


also, mike's check in comment #5, in octave 8.0.1:

>> a = ['aaa'; 'bbb'];
>> string_value (a)
error: 'string_value' undefined near line 1, column 1
>> cellstr_value (a)
error: 'cellstr_value' undefined near line 1, column 1

so it seems those functions no longer exist in octave?

and Rik's comment #6 and comment #7 tests:

Matlab 2022b:

>> x = {['aa'; 'bb']; ['aa'; 'cc']}
x =
  2×1 cell array
    {2×2 char}
    {2×2 char}
>> strcmp (x, 'aa')
ans =
  2×1 logical array
   0
   0
>> strcmp (x, {'aa'})
ans =
  2×1 logical array
   0
   0
>> strcmp (x, {'aa';'cc'})
ans =
  2×1 logical array
   0
   0
>> strcmp (x, {['aa';'cc']})
ans =
  2×1 logical array
   0
   1
>> x = {['ab']; ['cd'; 'ef']}
x =
  2×1 cell array
    {'ab'    }
    {2×2 char}
>> iscellstr (x)
ans =
  logical
   1
>> y = {['ab']; ['c'; 'e']}
y =
  2×1 cell array
    {'ab'    }
    {2×1 char}
>> iscellstr (y)
ans =
  logical
   1
 

and the same tests in Octave 8.0.1:

ﻳ誂>> x = {['aa'; 'bb']; ['aa'; 'cc']};
>> strcmp (x, 'aa')
warning: multi-row character matrix converted to a string, only the first row
is used
warning: multi-row character matrix converted to a string, only the first row
is used
ans =

  1
  1

>> strcmp (x, {'aa'})
ans =

  1
  1

>> strcmp (x, {'aa';'cc'})
ans =

  1
  0

>> strcmp (x, {['aa';'cc']})
warning: multi-row character matrix converted to a string, only the first row
is used
ans =

  1
  1

>> x = {['ab']; ['cd'; 'ef']}
x =
{
  [1,1] = ab
  [2,1] =

cd
ef

}

>> iscellstr (x)
ans = 1
>> y = {['ab']; ['c'; 'e']}
y =
{
  [1,1] = ab
  [2,1] =

c
e

}

>> iscellstr (y)
ans = 1



    _______________________________________________________

Reply to this item at:

  <https://savannah.gnu.org/bugs/?51412>

_______________________________________________
Message sent via Savannah
https://savannah.gnu.org/