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Please note that the recommended version of Scilab is 2025.0.0. This page might be outdated.
See the recommended documentation of this function
comparison
comparison, relational operators
Calling Sequence
a==b a~=b or a<>b a<b a<=b a>b a>=b
Arguments
- a
any type of variable for
a==b
,a~=b
a<>b
equality comparisons and restricted to real floating point and integer array for order related comparisonsa<b
,a<=b
,a>b
,a>=b
.- b
any type of variable for
a==b
,a~=b
a<>b
equality comparisons and restricted to real floating point and integer arrays for order related comparisonsa<b
,a<=b
,a>b
,a>=b
.
Description
Two classes of operators have to be distinguished:
- The equality and inequality comparisons:
a==b
,a~=b
(or equivalentlya<>b
). These operators apply to any type of operands.- The order related comparisons:
a<b
,a<=b
,a>b
,a>=b
. These operators apply only to real floating point and integer arrays.
The semantics of the comparison operators also depend on the operands types:
- With array variables
like floating point and integer arrays, logical arrays, string arrays, polynomial and rational arrays, handle arrays, lists... the following rules apply:
If
a
andb
evaluates as arrays with same types and identical dimensions, the comparison is performed element by element and the result is an array of booleans of the same size.If
a
andb
evaluates as arrays with same types, buta
orb
is a scalar, then the scalar is compared with each element of the other array. The result is an array of booleans of the size of the non scalar operand.If
a
orb
are arrays, but one of them is empty, then an equality or an inequality comparison is possible. In this case, the result is a scalar boolean.In the others cases the result is the boolean
%f
If the operand data types are different but "compatible" like floating points and integers, then a type conversion is performed before the comparison.
- With other type of operands
like
function
,libraries
, the result is%t
if the objects are identical and%f
in the other cases.Equality comparison between operands of incompatible data types returns
%f
.
Examples
//element wise comparisons (1:5)==3 (1:5)<=4 (1:5)<=[1 4 2 3 0] 1<[] list(1,2,3)~=list(1,3,3) "foo"=="bar" sparse([1,2;4,5;3,10],[1,2,3]) == sparse([1,2;4,5;3,10],[1,2,3]) //object wise comparisons (1:10)==[4,3] 'foo'==3 1==[] list(1,2,3)==1 isequal(list(1,2,3),1) isequal(1:10,1) //comparison with type conversion int32(1)==1 int32(1)<1.5 int32(1:5)<int8(3) p=poly(0,'s','c') p==0 p/poly(1,'s','c')==0
See Also
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