Maple Flow Control
We know what tools we need from the Matlab page. The difference between Matlab and Maple flow control is generally that Maple is a bit more verbose than Matlab.
If
The basic syntax is
if conditional then statement sequence; elif conditional then statement sequence; else statement sequence; end if;As always, the elif and else are optional.
The conditionals have a similar form to those in other languages. There are a few differences. First, conditionals in Maple do not have a truth value outside of the "if" statement context. In other words, the expression "5>2" has no truth value in Maple, but if 5>2 then c:=3; end if; has meaning. If you want to find the truth value of a conditional outside of an "if" statement, you must use the evalb function. Here is an example.
5=3+2; 5 = 5 evalb(5=3+2); true if 5>2 then x:=3; elif 5=2 then x:=103; end if; x := 3
It is worth a special note that Maple uses := for the assignment operator, which frees up = to be used to test equality. This differs from many other languages, which typically use == for that purpose. A table summarizing logical operators follows.
| Symbol | Meaning |
|---|---|
| = | Is Equal To |
| <> | Is Not Equal To |
| > | Is Greater Than |
| >= | Is Greater Than Or Equal To |
| < | Is Less Than |
| <= | Is Less Than Or Equal To |
| and | Logical And |
| or | Logical Or |
For
Maple has a for loop construction, just like every other language. The syntax is a bit different, however.for variable from expression to expression do statement sequence end do;You will find this to be fairly intuitive.
for i from 1 to 10 x[i] := i: end do; y := 0: for j from x[3] to x[3]^2 do y := y+j: end do; the_answer_to_life_the_universe_and_everything:=y; the_answer_to_life_the_universe_and_everything:=42
Note that the task of the first loop could have been done
more easily using
x:=[seq(i,i=1..10)];
