overloading - display, functions and operators overloading capabilities
In scilab, variable display, functions and operators may be defined for new objects using functions (scilab coded or primitives).
for binary operators: %<first_operand_type>_<op_code>_<second_operand_type>
for unary operators: %<operand_type>_<op_code>
extraction and insertion operators which are n-nary operators are described below.
<operand_type>, <first_operand_type>, <second_operand_type> are sequence of characters associated with each data type as described in the following table:
| data type | char code | data type | char code |
| constant | s | boolean | b |
| string | c | library | f |
| function pointer | fptr | handle | h |
| integer | i | list | l |
| function | m | compiled function | mc |
| polynomial | p | sparse | sp |
| boolean sparse | spb | tlist | tlist_type |
<op_code> is a single character associated with each operator as described in the following table:
| op | char code | op | char code |
| ' | t | + | a |
| - | s | * | m |
| / | r | \ | l |
| ^ | p | .* | x |
| ./ | d | .\ | q |
| .*. | k | ./. | y |
| .\. | z | : | b |
| *. | u | /. | v |
| \. | w | [a,b] | c |
| [a;b] | f | () extraction | e |
| () insertion | i | == | o |
| <> | n | | | g |
| & | h | .^ | j |
| ~ | 5 | .' | 0 |
| < | 1 | > | 2 |
| <= | 3 | >= | 4 |
The overloading function for extraction syntax b=a(i1,...,in) has the following calling sequence: b=%<type_of_a>_e_(i1,...,in,a)
and the syntax [x1,..,xm]=a(i1,...,in) has the following calling sequence: [x1,..,xm]=%<type_of_a>_e_(i1,...,in,a)
The overloading function associated to the insertion syntax a(i1,...,in)=b has the following calling sequence: a=%<type_of_a>_i_<type_of_b>(i1,...,in,b,a).
//DISPLAY
deff('[]=%tab_p(l)','disp([['' '';l(3)] [l(2);string(l(4))]])')
tlist('tab',['a','b'],['x';'y'],rand(2,2))
//OPERATOR
deff('x=%c_a_s(a,b)','x=a+string(b)')
's'+1
//FUNCTION
deff('x=%c_sin(a)','x=''sin(''+a+'')''')
sin('2*x')