Some examples which will demonstrate the tremendous power of APL:

⍝ A gets a vector with 100 random numbers between 1001 and 2000
      A←1000+?100⍴1000

⍝ What is the greatest number in A?
      ⌈/A

⍝ Drop all doubles
      ∪A

⍝ Sort A
      A[⍋A] 

⍝ Sort a text matrix "TXM" 
      TXM[⍋TXM;]

⍝ How many lines in TXM start with "APL"
      +/'APL'{⍺∧.=⍨(⍴⍺)↑[1]TXM}TXM

⍝ How many lines contain "APL" somewhere
      +/∨/'APL'⍷TXM[/modal]

⍝ Create a variable A with random numbers. 
⍝ The number of rows is defined by the number of items, 
⍝ the number of columns by the 12 months.
      A←?10 12 ⍴1000

⍝ Print first two lines
      ⎕←2↑A
419 738 915 496 260 318 561 921   9 817 372 831
632 231  89 323  97 577 741 711 666 745 585 939

⍝ Total
      +/,A
57014

⍝ Total per month
      +/[1]A
4136 5314 5407 2886 4093 5201 4779 5297 3741 5320 5766 5074

⍝ total per item
      +/[2]A
6657 6336 6549 6982 4702 5807 4499 5437 5129 4916