oldEmptyBehaviour

Arguments

behaviour

a single string amongst "on", "off" or "query". The behaviour mode for operation+ and operation-

Description

Controls the behaviour of the empty matrix addition and subtraction. On versions prior to scilab-6.0.0, adding or subtracting and empty matrix to any other value val would return val.

If behaviour == "off", adding or subtracting the empty matrix will yield to the empty matrix. This is the default behaviour of scilab after version 6.0.0.

If behaviour == "on", activates the behaviour prior to scilab-6.0.0.

If behaviour == "query", returns the current value ("on" or "off") for the oldEmptyBehaviour tag.

Examples

// Get the current behaviour
behaviour = oldEmptyBehaviour("query");

// These will return empty
oldEmptyBehaviour("off");
1 + []
"Test string" + []
[] - int8(1)
[] - %s

// These will leave the other operand unchanged
oldEmptyBehaviour("on");
1 + [] // returns 1
"Test string" + [] // returns "Test string"
[] - int8(1) // returns int8(1)
[] - %s // returns %s

// Get back to the saved behaviour
oldEmptyBehaviour(behaviour)

See also

• warning for the warning behaviour on operation+ and operation-
• plus for the behaviour of the operation+.
• minus for the behaviour of the operation-.