c# - How to 'delay' observable sequence by one value? -

in reactive extensions, how can 'delay' observable sequence 1 value? example:

original: 2 3 5 7 9    delayed:    2 3 5 7 

to clear, want delay sequence 1 step. isn't same delaying constant time.

try this:

var delayedbyone = source.zip(source.skip(1), (x, _) => x); 

but may need avoid running 2 concurrent sources if have cold observable source:

var delayedbyone = source.publish(s => s.zip(s.skip(1), (x, _) => x));