Write function to expand array and average adjacent entries.

2012 10 16
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Write a function twice.m: function y = twice(x) ... end which expands the input signal by inserting the average of the adjacent entries. For example, >> twice([1 5 2 4]) ans = 1 3 5 3.5 2 3 4 You are not allowed to use for-loop in this problem.

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Matt Fig
Matt Fig 2012-10-16
编辑：Matt Fig 2012-10-16

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Please show what you have done so far for your homework problem....
The more effort you show, the more help you will likely get.

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