Matrix Elements VB-800 Instrukcja Użytkownika Pobierz pdf (Strona 156)

148 Appendix A6 OxGauss Language Reference

will always be executed. For example, in the expression func1() .&& func2() the

second function is called, regardless of the return value of func1().

A6.8.11 Logical dot-OR expressions

The dot-or operator is written as .|| or .or. It returns 1 if either of its operands com-

pares unequal to 0, 0 otherwise. Both operands must have arithmetic type. Handling

of matrix-type is as for dot-relational operators: if one or both operands is a matrix,

the result is a matrix of zeros and ones. Unlike the non-dotted version, both operands

will always be executed. For example, in the expression func1() .|| func2() the

second function is called, regardless of the return value of func1().

A6.8.12 Logical dot-XOR expressions

The dot-or operator is written as .xor. It returns 1 if one and only one of the operands

compares unequal to 0, 0 otherwise. Both operands must have arithmetic type. Han-

dling of matrix-type is as for dot-relational operators: if one or both operands is a

matrix, the expression is evaluated for each element, and the result is a matrix of zeros

and ones.

A6.8.13 Logical dot-EQV expressions

The dot-eqv operator is written as .eqv. It returns 1 if both operands are unequal to 0 or

if both are equal to 0, 0 otherwise. Both operands must have arithmetic type. Handling

of matrix-type is as for dot-relational operators: if one or both operands is a matrix, the

expression is evaluated for each element, and the result is a matrix of zeros and ones.

A6.8.14 Relational expressions

The relational operators are <, <=, >, >=, ==, /=, standing for ‘less’, ‘less or equal’,

‘greater’, ‘greater or equal’, ‘is equal to’, ‘is not equal to’. They yield 0 if the speciﬁed

relation is false, and 1 if it is true.

The type of the result is always an integer, see Table A6.4. If both operands are

a matrix, the return value is true if the relation holds for each element. If one of the

operands is of scalar-type, and the other of matrix-type, each element in the matrix is

compared to the scalar, and the result is true if each comparison is true.

String comparison is case sensitive.

A6.8.15 Logical-NOT expressions

The logical negation operator not precedes the operand which must be scalar and have

arithmetic type. The result is 1 if the operand is equal to 0 and 0 otherwise.

1 2 ... 151 152 153 154 155 156 157 158 159 160 161 ... 171 172

Brak uwag

Matrix Elements VB-800 Instrukcja Użytkownika Strona 156