这期是关于R中的loop function(循环函数)中的apply族函数的笔记。当你想要对一个或一组对象执行循环时,使用循环函数可以用很短的语句来执行大量的工作。 目录 lapply与sapply apply mapply tapply 念碎碎 lapply与sapply > str(lapply) function (X, FUN, ...) 第一个参数X为目标list
#例 library(datasets) head(airquality) ##用这个datasets举例 ##每个月的Ozone和Wind的平均值 ##方法一 s <- split(airquality, airquality$Month) ##把airquality按Month 分组 lapply(s, function(x) colmean(x[,c("Ozone", "Wind")])) ##由于这种方法没有提前排除缺失值,多以得到的结果里有很多NA ...
lapply: Loop over a list and evaluate a function on each elementsapply: Same as lapply but try to simplify the result apply: Apply a function over the margins of an array tapply: Apply a function over subsets of a vector mapply: Multivariate version of lapply An auxiliary function split is...
3. Santos-Pereira,J. M. & Aguilera, A. R loops: new modulators of genome dynamics andfunction.Nat Rev Genet16, 583-597, doi:10.1038/nrg3961(2015). 4. Richard,P. & Manley, J. L. R Loops and Links to Human Disease.J Mol ...
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2. T. Misteli, The Self-Organizing Genome: Principles of Genome Architecture and Function. Cell 183, 28-45 (2020). 3. S. Yatskevich, J. Rhodes, K. Nasmyth, Organization of chromosomal DNA by SMC complexes. Annu....
...推送可调用函数的参数对象到栈中 26 CALL_FUNCTION 1 可调用函数及其参数会从栈中弹出,然后执行函数并将其返回值推送到 TOS 28 POP_TOP TOS(栈顶元素),即将函数返回值(这里是 1.8K20 文本处理三驾马车之 awk 表达式与操作符 Awk 表达式的符号与 C 语言的类似,基本的表达式有数字,字符串,变量,字段,数组...
into plant nuclear genome formation and function. Access options Access Nature and 54 other Nature Portfolio journals Get Nature+, our best-value online-access subscription 27,99 €/ 30 days cancel any time Learn more Subscribe to this journal...
for(iin1:5){# for-loop with breakif(i==4){break}print(paste("This is step", i))} Figure 2: for-loop with break Function. As shown in Figure 2, the loop stops (or“breaks”) when our running index i is equal to the value 4. For that reason, R returns only three sentences...
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