![]() I also changed this to work in a Desktop app rather than being a Console app so you can ignore the TextArea1.VerticalScrollPosition and the DoEvents (which you should not use in a real app) as they are just there so you can see the value change in realtime. State = Bitwise.ShiftRight(state, 1) Or Bitwise.ShiftLeft(newbit, 63) ![]() TextArea1.VerticalScrollPosition = TextArea1.LineNumber() // Scroll to endĪpp.DoEvents // Don't do this in a real app!! TextArea1.AddText(Bitwise.BitAnd(state, 1).ToBinary(1)) Var state As UInt64 = Bitwise.ShiftLeft(1, 63) Or 1 Updated to use correct tap bits for 64-bit numbers (Oct 5, 2021) Var state As UInt64 = Bitwise.ShiftLeft(1, 63) Or 1 The Xojo code below ought to help you understand them better. If you’ve not used Python before, you might find all the symbols to be a bit cryptic. So we have to tweak the Python code to work with 64-bit integers, which are more commonly available and the maximum supported in Xojo. One thing about Python is that its integers are arbitrary precision unlike most other programming languages like Xojo, Java or C#. The trick is to use a shift register of sufficient length so that the pattern repeats after some extremely long time. Codes generated by a LFSR are actually 'pseudo' random, because after some time the numbers repeat. Here’s the original Python code: state = (1 > 1) ^ (state > 2) ^ (state > 7)) & 1 The most common way to implement a random number generator is a Linear Feedback Shift Register (LFSR). ![]() Pound uses Python for his example, so I thought I’d quickly convert it to Xojo. The PN Sequence Generator block generates a sequence of pseudorandom binary numbers using a linear-feedback shift register (LFSR).
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