Need some examples using Lookup( I'm playing with led matrix sample code)

[tacbanon]

Now it's clearer for me.
Back in the led matrix code...

Lookup yazi_reg,[30,"HELLO WORLD LED MATRIX DISPLAY "],harf_reg

Will this code be valid?

i VAR Byte
ArrayWrite str1,["HELLO WORLD LED MATRIX DISPLAY "]
For i = 0 To 29
    harf_reg = str1[i]
    GoSub data_sec

Next

I assumed harf_reg will now hold the index value of each character and locate the corresponding ascii character...

Thanks again,
tacbanon