Scilab Bag Of Tricks - Claymore

[y, dy] = fun(x);
end;
x
Chapter 3. Style
Assuming that the function fun, and the start guess x0 are supplied by the user, we do not know how
many loops it will take for Newton’s algorithm to converge, if it does converge at all. (In the example
it does.) Here, the while-loop expresses this lack of a-priori knowledge.
3.4.2. if/select
The relationship between if and select bears similarity to while and for, respectively. In a
select clause the different cases are known – and spelled out explicitely – before the thread of
control enters the construct. There is a one to one relationship between the states of the selecting
expression and the case branch taken. The else branch in a select works exactly as the else in
an if.
function f = fibonacci(n)
// return n-th Fibonacci number
select n
case 0 then
f = 1
case 1 then
f = 1
else
f = fibonacci(n - 1) + fibonacci(n - 2)
end
The selecting expression is not restricted to scalars, vectors for example work too:
function s = shape4(m)
// classify a 2x2 matrix according to its shape
select abs(m)