[R包开发]报错解决：replacing previous im

1.问题产生

最近开发R包的时候碰到了一个warmings:

warmings

2.寻求解决途径

这个warmings困扰了我好久，都没找到解决办法。于是我又开启了一波疯狂的网络搜索：下方是搜索到相关资料
2.1前人的类似问题：

how to avoid the warning of replacing previous import edgeR::rpkm by NOISeq::rpkm when loading ComSeq
https://stat.ethz.ch/pipermail/bioc-devel/2017-June/011129.html

链接中关键信息如下截图

关键信息.png

2.2搜索Writing R Extensions中关于import和importfrom内容，然而并未找到有效的解决办法
https://cran.r-project.org/doc/manuals/r-release/R-exts.html

3.最终的解决方案

https://stackoverflow.com/questions/8662285/warning-replacing-previous-import-head-when-loading-utils-in-r

解决办法
将所有的import改成 importfrom

4.问题分析

该报错是由于import和importfrom混用所造成的，我们只保留importfrom即可解决这类warming。

最后看看大神Y叔的clusterprofiler中的namespace，果然都没用import

 Generated by roxygen2: do not edit by hand
S3method("[",compareClusterResult)
S3method("[[",compareClusterResult)
S3method(as.data.frame,compareClusterResult)
S3method(dim,compareClusterResult)
S3method(fortify,compareClusterResult)
S3method(geneID,groupGOResult)
S3method(geneInCategory,groupGOResult)
S3method(head,compareClusterResult)
S3method(tail,compareClusterResult)
export(GSEA)
export(Gff2GeneTable)
export(bitr)
export(bitr_kegg)
export(browseKEGG)
export(buildGOmap)
export(compareCluster)
export(download_KEGG)
export(dropGO)
export(enrichDAVID)
export(enrichGO)
export(enrichKEGG)
export(enrichMKEGG)
export(enricher)
export(go2ont)
export(go2term)
export(gofilter)
export(groupGO)
export(gseGO)
export(gseKEGG)
export(gseMKEGG)
export(idType)
export(merge_result)
export(plot)
export(plotGOgraph)
export(read.gmt)
export(search_kegg_organism)
exportClasses(compareClusterResult)
exportClasses(groupGOResult)
exportMethods(dotplot)
exportMethods(simplify)
importClassesFrom(DOSE,enrichResult)
importClassesFrom(DOSE,gseaResult)
importClassesFrom(methods,data.frame)
importFrom(AnnotationDbi,Ontology)importFrom(AnnotationDbi,as.list)
importFrom(AnnotationDbi,keys)
importFrom(AnnotationDbi,keytypes)
importFrom(AnnotationDbi,select)
importFrom(AnnotationDbi,toTable)
importFrom(DOSE,dotplot)
importFrom(DOSE,geneID)
importFrom(DOSE,geneInCategory)
importFrom(DOSE,setReadable)
importFrom(DOSE,theme_dose)
importFrom(GO.db,GOBPANCESTOR)
importFrom(GO.db,GOBPCHILDREN)
importFrom(GO.db,GOCCANCESTOR)
importFrom(GO.db,GOCCCHILDREN)
importFrom(GO.db,GOMFANCESTOR)
importFrom(GO.db,GOMFCHILDREN)
importFrom(GO.db,GOTERM)
importFrom(GOSemSim,godata)
importFrom(GOSemSim,load_OrgDb)
importFrom(GOSemSim,mgoSim)
importFrom(ggplot2,"%+%")
importFrom(ggplot2,aes)
importFrom(ggplot2,aes_)
importFrom(ggplot2,aes_string)
importFrom(ggplot2,coord_flip)
importFrom(ggplot2,element_text)
importFrom(ggplot2,fortify)
importFrom(ggplot2,geom_bar)
importFrom(ggplot2,geom_point)
importFrom(ggplot2,ggplot)
importFrom(ggplot2,ggtitle)
importFrom(ggplot2,scale_colour_gradient)
importFrom(ggplot2,theme)
importFrom(ggplot2,theme_bw)
importFrom(ggplot2,xlab)
importFrom(ggplot2,ylab)
importFrom(magrittr,"%<>%")
importFrom(magrittr,"%>%")
importFrom(methods,new)
importFrom(plyr,.)
importFrom(plyr,ddply)
importFrom(plyr,dlply)
importFrom(plyr,ldply)
importFrom(plyr,llply)
importFrom(plyr,mdply)
importFrom(plyr,rename)
importFrom(qvalue,qvalue)
importFrom(rvcheck,get_fun_from_pkg)
importFrom(stats,formula)
importFrom(stats,setNames)
importFrom(stats4,plot)
importFrom(tidyr,gather)
importFrom(utils,browseURL)
importFrom(utils,citation)
importFrom(utils,head)
importFrom(utils,installed.packages)
importFrom(utils,packageDescription)
importFrom(utils,read.table)
importFrom(utils,stack)
importFrom(utils,str)
importFrom(utils,tail)
importMethodsFrom(AnnotationDbi,mappedkeys)
importMethodsFrom(AnnotationDbi,mget)
importMethodsFrom(DOSE,plot)
importMethodsFrom(DOSE,show)
importMethodsFrom(DOSE,summary)