what is the wrong here
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回答（2 个）
Image Analyst
2020-12-24
0 个投票
You never assigned any values to t before you tried to use t. What values do you think/expect/want t to have? You have to assign them to t first.
Cris LaPierre
2020-12-24
0 个投票
Do you realize your screenshot has nothing to do with the code you've shared?
- You are not using a valid variable name
- Your screenshot shows you are trying to use a variable you have not defined (clearly stated in the red error message)
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2020-12-24
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