From help-octave-request at bevo dot che dot wisc dot edu Sun Jan 11 21:44:37 2004
Subject: Re: Data Structure Question
From: "Henry F. Mollet" <mollet at pacbell dot net>
To: Paul Kienzle <pkienzle at users dot sourceforge dot net>
CC: Octave_post <help-octave at bevo dot che dot wisc dot edu>
Date: Sun, 11 Jan 2004 19:40:34 -0800

Thanks. I used a comma instead of a semi-colon because I was hoping to get a
row-vector for my variable names. Then I've tried your suggestion of using a
cell structure instead of a data structure (if this is the correct
terminology) and had difficulties with referencing my row comments and
variable names (see below with comments).
Henry

octave:48> mySpreadSheet
mySpreadSheet =

{
  [1,1] =
    1.0000  1.1000  2.1000  3.1000
    2.0000  1.2000  2.2000  3.2000
    3.0000  1.3000  2.3000  3.3000
    4.0000  1.4000  2.4000  3.4000
  [1,2] =
male  
fem   
male  
female
  [1,3] =
Var1
Var2
Var3
Var4
}

octave:49> iscell (mySpreadSheet)
ans = 1  % OK
octave:51> mySpreadSheet{1}(1,3)
ans = 2.1000 %OK third value in first row
octave:52> mySpreadSheet{2}(1)
error: single index only valid for row or column vector
% looks like a col-vector to me?
octave:52> mySpreadSheet{2}(1,1)
ans = m % first letter of male but I was hoping to get "male"
% Does it imply that I can index with only one letter
% If so, I might as well index with a number using an
% additional col in my matrix?
octave:53> mySpreadSheet{3}(1)
error: single index only valid for row or column vector
% as above for row index
octave:53> mySpreadSheet{3}(1,1)
ans = V % as above for row index



on 1/10/04 1:08 PM, Paul Kienzle at pkienzle at users dot sf dot net wrote:

> You have a ';' in comment and a ',' varname which is why it doesn't work
> like you expect.  You will be better off using {} rather than [] for an
> array
> of strings because you can then use x.comment{i} rather than
> deblank(x.comment(i,:)) to reference them.  You need the deblank
> for [] because a character matrix must be rectangular.  You don't
> need it for {} because a vector of values can contain character vectors
> of different lengths.
> 
> Paul Kienzle
> pkienzle at users dot sf dot net
> 
> On Jan 10, 2004, at 1:27 PM, Henry F. Mollet wrote:
> 
>> Am I on the right track here for the use of a data structure? I'd like
>> to
>> add variable names (columns) and comments (rows) to a matrix a. It
>> seems to
>> work for the comments but not the varnames.
>> Henry
>> 
>> 
>> octave:13> x.a = [1,2;3,4];
>> octave:14> x.comment = ["FirstRowComment"; "SecondRowComment"];
>> octave:15> x.varname = ["Var1", "Var2"];
>> octave:16> x
>> x =
>> {
>>   a =
>> 
>>     1  2
>>     3  4
>> 
>>   comment =
>> 
>> FirstRowComment
>> SecondRowComment
>> 
>>   varname = Var1Var2
>> }
>> 
>> 
>> 
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