indexable collection of arrays

Question

hello dear Kyma friends,

I would like to have find a way to store a collection of different arrays and to select at runtime which one I need for my sound.

I am trying with this script on a STGC:

1 to: 8 do: [:i |
    stgc start: 0 s
    pt: (!Script of: #( {#(1 0 1 0 1 0 1 0)} {#( 2 5 2 5 3 4 34)})) at: i
    debug: ('debug'&i) asHotValue]

but I get this error message:

"Error: The message #*, sent to (1 0 1 0 1 0 1 0), an instance of class Array, was not understood"

I got this message also in other sound and script that I have been trying for this purpose.

thanks.

d

Answer 1

Re-reading your question, I see that you wanted eight STGCs! So instead, you could use:

1 to: 8 do: [:i |
    stgc start: 0 s 
    pt: (!Script of: (#( #(1 0 1 0 1 0 1 0) #( 2 5 2 5 3 4 34) ) collect: [ :array | array at: i]))
    debug: ('debug'&i) asHotValue]

In this example, !Script selects an element within the array that consists of a collection of values taken from the i-th entry of each of your arrays.

(I left the other answer too, just in case someone else would prefer to use that approach).

Comments

thanks a lot!
this is what I needed :)

I have another question regarding this:
when should array be put inside curlies?

---

and if I would like to declare a variable containing one of the arrays;
for example
|p1|
p1 := #(1 0 1 0 1 0 1 0).

where should it be placed?

Answer 2

Hello Domenico,

I think the issue is that the Smalltalk message at: is computed at compile-time, not at run-time. If instead you use the Capytalk of:, for example,

(!Index_i of: #(0 1 2)) of: #({!Index_j of: #(10 11 12)} {!Index_j of: #(20 21 22)} {!Index_j of: #(30 31 32)})

then !Index_i will select one of the Arrays: #(10 11 12)  #(20 21 22) #(30 31 32). And !Index_j will select one element from that Array.

For example, for !Index_1 = 1 and !Index_j = 2, the value of the expression is 22.

Whereas, for !Index_1 = 2 and !Index_j = 0, the value of the expression is 30.