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Say you have four values in variable VALS like this a b c d then you can build an array containing these with a simple set statement.
$ set VALS="a b c d"
$ set master_array = ( $VALS )
$ echo...

Assigning the array with set will automatically size to the input eg.

$ set arr=(1 2 3 4 5)
$ set newarr=(1 2 3 4 5 6 7 8 9 10)
$ echo ${#arr}
5
$ set arr=( $newarr:q )
$ echo ${#arr}
10

Not quite sure what you mean by input as an array value. It's fairly straight forward to pre-load an array with fixed values or copy an existing array into another:

$ set ar=(10 165 22 156)
$...

You could try this:

set ar=()
set x=10
foreach i ( `seq $x`)
set ar=($ar:q " ")
end
echo ${#ar}

However with my csh (tchs 6.22.01) using $arr:q to print array elements with quotes...