eq.m

Interval Arithmetic Toolbox for Matlab

function info = eq(a,b)

%EQ (interval) implements (eq)ual for intervals (a==b).
%
%b4m - datatype interval    Version 1.02    (c) 3.9.1998 Jens Zemke
%
%   DESCRIPTION:
%     'eq' is called
%
%         info = a == b
%
%     or
%
%         info = eq(a,b)
%
%     and computes whether a equals b.
%
%     The operations on the datatype interval
%     are based on BIAS by Olaf Knueppel.
%
%   SEE ALSO:
%     interval: le, lt, ge, gt, ne, in, in_interior, in0.
%     double: eq.

if     isa(a, 'double')
   info = (    a  == inf(b) &     a  == sup(b));
elseif isa(a, 'interval') & isa(b, 'interval')
   info = (inf(a) == inf(b) & sup(a) == sup(b));
elseif isa(b, 'double')
   info = (inf(a) ==     b  & sup(a) ==     b );
else
   error('Class error.')
end