Lu Jiancheng

Fix issue#6242

1

### Describe your change: * [ ] Add an algorithm? * [x] Fix a bug or typo in an existing algorithm? * [ ] Documentation change? ### Checklist: * [x]...

Theres is a problem in "maths/newton_raphson.py"

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In file "maths/newton_raphson.py", there is a error in function "newton_raphson()". It likes that variables "error" was not refreshed in for-iterator process。So we need to recalculate the "error" in for-loop block,...