Just because you are calling two functions doesn't mean it is slow. Have 
you benchmarked?

On Sunday, September 18, 2016 at 11:55:47 AM UTC+2, K leo wrote:
> I have been using simply A=[0; A[1:end-1]], but found it to be somehow 
> quite expensive.  I saw that there is unshift! but it has to be followed up 
> with deleteat! to make the array the same size, i.e. there need to be two 
> operations.  So how can I get a better performance doing the shift?

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