have a problem to assign value to signal

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electronical

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in this command
a(i)<=b;
a will change when b changing or when i changing too.(in the real )
 

This is a pretty useless code snippet. Without context (like is it inside a process, or outside a process inside a generate loop, or where) its nearlly impossible to answer your question. Please post more code.

The questions are:
1. is b a variable or signal or constant?
2. is i a variable or signal or constant?
3. is this inside a process or outside?
 

Can you post some code of what you are trying to do?
 

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