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Problems ....




I am a new user. need help to know more about mathematica. Anyone can
help me do the following:

1. Let Y={a,b} and let X be an arbitrary numeric vector. Replace all
occurances of a in X with b.

2. Sort the elements of X in ascending order of absolute value.

3. Square each elements of a vector X but keep its sign.

4. Remove second element of the vector X without using the Table
function

thanks.




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