ind2sub

(tmp_for_tar/vrml.doc/ind2sub.m)

Function Synopsis

ii = ind2sub(sz,r,c)

Help text

       i = ind2sub(sz,r,c) = ind2sub(sz,[r,c])

 i is the indice of element (r,c) in a matrix of size sz. That is, 
 i=(c-1)*sz(1)+r

 See also sub2ind.

 Last modified: January 2000

Listing of function file tmp_for_tar/vrml.doc/ind2sub.m

##       i = ind2sub(sz,r,c) = ind2sub(sz,[r,c])
## 
## i is the indice of element (r,c) in a matrix of size sz. That is, 
## i=(c-1)*sz(1)+r
##
## See also sub2ind.
##

## Author:        Etienne Grossmann  <etienne@isr.ist.utl.pt>
## Last modified: January 2000

function ii = ind2sub(sz,r,c)
  if nargin==2,
    if size(r,2)==2,		# Assume it's [r,c]
      c = r(:,2);
      r = r(:,1);
    else			# Assume it's [r;c]
      c = r(2,:);
      r = r(1,:);
    end
  elseif nargin!=3,
    printf("ind2sub : 2 or 3 args are needed\n");
    keyboard
  end
    
  ii=(c-1)*sz(1)+r;

  if any(r<=0) || any(c<=0) || any(ii<=0),
    if any(r<=0) , printf("ind2sub : Whoa!! negative rows\n"); end
    if any(c<=0) , printf("ind2sub : Whoa!! negative columns\n"); end
    if any(ii<=0), printf("ind2sub : Whoa!! negative subscript\n");end
    keyboard
  end