Classed as one of the fastest web browsers on the market, Opera is loaded with features and tempting extras that place the software package up among the most popular browsers. The …

The Office of Payment Accuracy and Recovery (OPAR) makes sure the Oregon Department of Human Services (ODHS) spends tax dollars in a way that is responsible, efficient and fair. We …

Did you get a notice of overpayment from ODHS? If you were overpaid by the Oregon Department of Human Services (ODHS), you will need to pay back the extra money or benefits you …

Opar is a fictional lost city in the Tarzan novels of Edgar Rice Burroughs and later the Khokarsa novels of Philip José Farmer and Christopher Paul Carey, as well as various derivative works …

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Opar or OPAR may refer to: Opar (fictional city), a fictional lost city in Edgar Rice Burroughs's series of Tarzan novels; Opar (state constituency), a state constituency of Malaysia; Opar, …

按照我的理解就是：opar <- par(no.readonly = TRUE)用来更改当前变量环境， par(opar)用来还原默认变量环境。

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一.问题1.画图时 开头opar<-par(no.readonly=TRUE) #把现有图形参数存入变量opar中 结尾par(opar) #？ 的意义在于？ 2.plot的用法还需要进一步明确，可试用的数据类型？

opar <- par(no.readonly=TRUE)这个语句会保存执行此语句之前已经设定好的参数。 lty与pch这两个参数我们也可以直接用plot函数执行，但是这个只对当前作图有效。