Re: length() of an atom
- Posted by Vinoba Sep 22, 2010
- 1571 views
Here is what Keneth Iverson defined for scalar values and vctors. In APL, a scalar is somewhat similar to atom nad is treated as a one element vector when an operation is performed which might make a vector. ⍝ is a comment character. I have added to make non-APLers comfortable. APL has no precedence. it executes from right to left. ⍴ is a monadic function for shape and ← is used for assignment - same as = in many languages.
var1 ← 5 ⍝ // Assign a single value 5 to a variable called var1
var1 ⍝ // show what is in var1
5
⎕ ← nshape ← ⍴ var1 ⍝ //shape of var1 assigned to nshape and show - result is nothing
⍴ nshape ⍝ // nshape is actually an empty vector with shape of 0
0
⍴ nshape ⍝ // nshape is actually an empty vector with shape of 0
0
⍴ vshape ← var2 ← var1 , 12 18 43 ⍝ // , is a join function in APL
4
var2 ⍝ // var2 is a join of var 1 and a three elment sequence. shape is 4
5 12 18 43
