algorithm - Code-golf: generate pascal's triangle

Question

question from:https://stackoverflow.com/questions/1242073/code-golf-generate-pascals-triangle

Answer 1

J, another language in the APL family, 9 characters:

p=:!/~@i.

This uses J's builtin "combinations" verb.

Output:

   p 10
1 1 1 1 1  1  1  1  1   1
0 1 2 3 4  5  6  7  8   9
0 0 1 3 6 10 15 21 28  36
0 0 0 1 4 10 20 35 56  84
0 0 0 0 1  5 15 35 70 126
0 0 0 0 0  1  6 21 56 126
0 0 0 0 0  0  1  7 28  84
0 0 0 0 0  0  0  1  8  36
0 0 0 0 0  0  0  0  1   9
0 0 0 0 0  0  0  0  0   1