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--- title: "class3" output: html_document date: "2023-04-07" --- matrix data.fra...
---title: "class6.1"author: "xiaowang"date: "2023-04-18"output: html_document---...
This is an R Markdown document. Markdown is a simple formatting syntax for autho...
When you click the Knit button a document will be generated that includes both c...
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