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[WB3]

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[PBGuru]

In the APL language … there are many special symbols (special keys on the keyboard) that perform mathematical and logical functions.

∧ is logical “AND” so 1 ∧ 0 would yield 0
∨ is logical “OR” so 1 ∨ 0 would yield 1

Of course.. since APL is a fully encapsulated language, we can easily create “words” for any “functions” we need.
So, for example, I could extend the APL language by adding the following APL functions
(Note the ∇ symbol is one way to define a function)

∇Z←A OR B
Z←A ∨ B
∇

Now, we have a function named OR that performs the logical function of ∨ but wrapped in a more “friendly” function name OR

1 OR 0 would yield 1

APL also handles any size or shape data object without any changes to the functions or syntax.

So
1 0 0 1 1 OR 1 1 0 0 0 would yield 1 1 0 1 1

APL allows the creation of Variables to hold data.
APL variables do not need to be pre-declared … you just start using them.

V1 ← 1 0 0 1 1
V2 ← 1 1 0 0 0

So, now I can call the OR function, passing the variables (V1 and V2)

V1 OR V2 would yield 1 1 0 1 1

Can store results of any function, as needed.

R←V1 OR V2

R is now the “vector” 1 1 0 1 1

APL is cool.