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can you repost the code with a real example. Std_logic_vector is a type and you cannot index into it. You are also implying you want to assign an ever decreasing sized vector - you're not allowed to have an array of vectors with different sizes.
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thanks alot my friend
i wanna translate haar algorithm to vhdl code
plz see these pictures:
http://i41.tinypic.com/35ksllh.jpg &
http://i39.tinypic.com/2u6ftyx.png how i can do this? i though for writing this code i need to have a loop that makes different vectors.