How Julia loop works with vector?

General Usage
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Julia vs Matlab
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Recently I have been encountering a problem that I want to make a vector that store the old matrix that I need to make my new matrix. However, in Julia while I change my new matrix, the old matrix follow. So, I wonder how should I do this step in Julia?

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You should copy the vector if you need, well, a copy. There’s no automatic copy on assigment and all assignments has the semantic of binding to the reference of an object instead of copying.

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y2 = copy(y), otherwise you set them to reference the same memory.

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Thank you guys, that is very helpful