apostrophe after linspace code

[Marc Normandin]

Siddhartha wrote:
> can anyone tell me the significance of having the apostrophe
> ' after a line of code?
> 
> something like this:
> 
> x = linspace(0,100,100)';
> 
> What is the difference between having that and leaving it
> out? I can't tell, so any help would be great!
> 
> THanks,
> Siddhartha Owens

Hi Siddhartha,

The apostrophe acts as the transpose operator, flopping rows for columns
and columns for rows.  In your example, the act of transposing simply
turns a row vector (see variable y below) into a column vector.

octave:1> x = linspace (0, 100, 100)';
octave:2> y = linspace (0, 100, 100);
octave:3> whos x y

*** local user variables:

  Prot Name        Size                     Bytes  Class
  ==== ====        ====                     =====  =====
   rwd x         100x1                        800  double
   rwd y           1x100                      800  double


Regards,
Marc

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Marc D. Normandin              http://web.ics.purdue.edu/~mdnorman
Graduate Research Assistant                     mnormand at iupui.edu
Indiana University School of Medicine           317-278-9841 (tel)
Department of Radiology, Division of Research   317-274-1067 (fax)
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