pkg1 <- c("ROCR","mvtnorm","pheatmap","foreach","psych","formatR","knitr")

for (x in pkg1) {
    library(x,character.only = TRUE)
}

Loading required package: gplots

Attaching package: ‘gplots’

The following object is masked from ‘package:stats’:

    lowess

Warning message:
“package ‘mvtnorm’ was built under R version 3.4.4”Warning message:
“package ‘foreach’ was built under R version 3.4.3”Warning message:
“package ‘knitr’ was built under R version 3.4.3”

pkg2 <- c("tidyverse", "dendextend", "RColorBrewer")

for (x in pkg2) {
    library(x,character.only = TRUE)
}

Warning message:
“package ‘tidyverse’ was built under R version 3.4.2”── Attaching packages ─────────────────────────────────────── tidyverse 1.2.1 ──
✔ ggplot2 3.0.0     ✔ purrr   0.2.5
✔ tibble  1.4.2     ✔ dplyr   0.7.6
✔ tidyr   0.8.1     ✔ stringr 1.3.1
✔ readr   1.1.1     ✔ forcats 0.3.0
Warning message:
“package ‘ggplot2’ was built under R version 3.4.4”Warning message:
“package ‘tibble’ was built under R version 3.4.3”Warning message:
“package ‘tidyr’ was built under R version 3.4.4”Warning message:
“package ‘purrr’ was built under R version 3.4.4”Warning message:
“package ‘dplyr’ was built under R version 3.4.4”Warning message:
“package ‘forcats’ was built under R version 3.4.3”── Conflicts ────────────────────────────────────────── tidyverse_conflicts() ──
✖ ggplot2::%+%()      masks psych::%+%()
✖ purrr::accumulate() masks foreach::accumulate()
✖ ggplot2::alpha()    masks psych::alpha()
✖ dplyr::filter()     masks stats::filter()
✖ dplyr::lag()        masks stats::lag()
✖ purrr::when()       masks foreach::when()

---------------------
Welcome to dendextend version 1.8.0
Type citation('dendextend') for how to cite the package.

Type browseVignettes(package = 'dendextend') for the package vignette.
The github page is: https://github.com/talgalili/dendextend/

Suggestions and bug-reports can be submitted at: https://github.com/talgalili/dendextend/issues
Or contact: <tal.galili@gmail.com>

        To suppress this message use:  suppressPackageStartupMessages(library(dendextend))
---------------------


Attaching package: ‘dendextend’

The following object is masked from ‘package:stats’:

    cutree

pkg3 <- c("DESeq2","golubEsets","genefilter", "multtest", "qvalue", "limma")

for (x in pkg3) {
    library(x,character.only = TRUE)
}

Warning message:
“package ‘DESeq2’ was built under R version 3.4.2”Loading required package: S4Vectors
Warning message:
“package ‘S4Vectors’ was built under R version 3.4.2”Loading required package: stats4
Loading required package: BiocGenerics
Warning message:
“package ‘BiocGenerics’ was built under R version 3.4.2”Loading required package: parallel

Attaching package: ‘BiocGenerics’

The following objects are masked from ‘package:parallel’:

    clusterApply, clusterApplyLB, clusterCall, clusterEvalQ,
    clusterExport, clusterMap, parApply, parCapply, parLapply,
    parLapplyLB, parRapply, parSapply, parSapplyLB

The following objects are masked from ‘package:dplyr’:

    combine, intersect, setdiff, union

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    IQR, mad, sd, var, xtabs

The following objects are masked from ‘package:base’:

    anyDuplicated, append, as.data.frame, cbind, colMeans, colnames,
    colSums, do.call, duplicated, eval, evalq, Filter, Find, get, grep,
    grepl, intersect, is.unsorted, lapply, lengths, Map, mapply, match,
    mget, order, paste, pmax, pmax.int, pmin, pmin.int, Position, rank,
    rbind, Reduce, rowMeans, rownames, rowSums, sapply, setdiff, sort,
    table, tapply, union, unique, unsplit, which, which.max, which.min


Attaching package: ‘S4Vectors’

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    first, rename

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    expand

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    expand.grid

Loading required package: IRanges
Warning message:
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Attaching package: ‘IRanges’

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    collapse, desc, slice

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    reduce

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    reflect

Loading required package: GenomicRanges
Warning message:
“package ‘GenomicRanges’ was built under R version 3.4.3”Loading required package: GenomeInfoDb
Warning message:
“package ‘GenomeInfoDb’ was built under R version 3.4.2”Loading required package: SummarizedExperiment
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“package ‘SummarizedExperiment’ was built under R version 3.4.3”Loading required package: Biobase
Warning message:
“package ‘Biobase’ was built under R version 3.4.2”Welcome to Bioconductor

    Vignettes contain introductory material; view with
    'browseVignettes()'. To cite Bioconductor, see
    'citation("Biobase")', and for packages 'citation("pkgname")'.

Loading required package: DelayedArray
Warning message:
“package ‘DelayedArray’ was built under R version 3.4.2”Loading required package: matrixStats
Warning message:
“package ‘matrixStats’ was built under R version 3.4.3”
Attaching package: ‘matrixStats’

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    anyMissing, rowMedians

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    count


Attaching package: ‘DelayedArray’

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    colMaxs, colMins, colRanges, rowMaxs, rowMins, rowRanges

The following object is masked from ‘package:base’:

    apply

Warning message:
“package ‘genefilter’ was built under R version 3.4.2”
Attaching package: ‘genefilter’

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    rowSds, rowVars

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Warning message:
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Attaching package: ‘multtest’

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Warning message:
“package ‘qvalue’ was built under R version 3.4.2”Warning message:
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Attaching package: ‘limma’

The following object is masked from ‘package:DESeq2’:

    plotMA

The following object is masked from ‘package:BiocGenerics’:

    plotMA

library(rentrez)
COI <- entrez_fetch(db = "nucleotide", id = 167843256, rettype="fasta")
cat(COI)

Error in library(rentrez): there is no package called ‘rentrez’
Traceback:

1. library(rentrez)
2. stop(txt, domain = NA)