Turn your R code into packages that others can easily download and use. This practical book shows you how to bundle reusable R functions, sample data, and documentation together by applying the package development philosophy used in the package known as the tidyverse (and beyond). In the process, you'll work with devtools, usethis, roxygen2, and testthat, a set of R packages th...(展开全部)

Turn your R code into packages that others can easily download and use. This practical book shows you how to bundle reusable R functions, sample data, and documentation together by applying the package development philosophy used in the package known as the tidyverse (and beyond). In the process, you'll work with devtools, usethis, roxygen2, and testthat, a set of R packages th...(展开全部)

简介：（修改中）坏心情，快消失。

简介：（修改中）坏心情，快消失。

Sebastião Salgados photographs have been shown around the world. In From my land to the Planet the photographer tells us the story of his most famous reportages: from the black and white portraits of unknown men and women, workers or refugees, to the more recent Genesis project, a portrait of the most incontaminated places of our planet. With a kindness and a disarming simplici...(展开全部)

皮埃尔·布尔（1912-1994），法国小说家，青年时期在马来亚经营香蕉种植园，二战爆发后，加入戴高乐领导的自由法国力量，在中国、缅甸等地与日军作战。代表作有《桂河大桥》和《人猿星球》。 译者孙凯，北京大学法语系教师，译著有朱斯蒂娜•莱维的《坏女儿》、阿拉斯的《绘画史事》等作品。

简介：自设abo，正负cp都是he开学可能周六日双更中考完连更

#1 NEW YORK TIMES BESTSELLER • #1 WALL STREET JOURNAL BESTSELLER • USA TODAY BESTSELLER Straight from the mind of #1 New York Times bestselling author Nathan W. Pyle, Strange Planet is an adorable and profound universe in pink, blue, green, and purple, based on the phenomenally popular Instagram of the same name! Strange Planet covers a full life cycle of the planet’s inhabitan...(展开全部)

How can we help poorer countries become richer without harming the planet? Is there a way of reconciling prosperity with nature? World-renowned economist Paul Collier offers smart, surprising and above all realistic answers to this dilemma. Steering a path between the desires of unchecked profiteering and the romantic views of environmentalists, he explores creative ways to dea...(展开全部)