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                ## 基本散點圖展示 ### 應用場景 eg: 依據設定的方向展示某種特征數值的變化趨勢。比如說:基因的表達隨患者年齡的變化趨勢,基因的表達隨腫瘤大小的變化趨勢等等 ![scatter plot](http://kancloud.nordata.cn/2018-12-30-074231.png) ### 利用plot創建line plot ```R load('./cli_test.Rdata')$rt_cli # rt_cli如上圖所示 x <- c(1:57) #創造一個于TP53有相同長度的數值向量 y <- rt_cli$TP53[order(rt_cli$TP53)] #將TP53的表達值從大到小排序 plot(x, y, type = "S") ``` ![scatter plot](http://kancloud.nordata.cn/2018-12-30-74232.png) ```R # type 改變線的類型 # xlab和ylab 添加x和y的標簽 # cex.lab, cex.axis改變字體大小 plot(x, y, type = "b", pch = 19, cex.lab = 2, cex.axis=2, col = "red", xlab = "virtual", ylab = "TP53") ``` ![scatter plot](http://kancloud.nordata.cn/2018-12-30-074233.png) ### 利用ggplot2創建line plot ```R library(ggplot2) data <- data.frame(cbind(x, y), stringsAsFactors = FALSE) #準備一個ggplot2所需要的數據格式 colnames(data) <- c('virtual', 'TP53') ggplot(data = data, aes(x = virtual, y = TP53)) + geom_line() ``` ![scatter plot](http://kancloud.nordata.cn/2018-12-30-074235.png) ```R # theme_classic() 主題類型 # color 改變line的顏色 ggplot(data = data, aes(x = virtual, y = TP53)) + geom_line(color = "blue") + theme_classic() ``` ![scatter plot](http://kancloud.nordata.cn/2018-12-30-074236.png)
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