April 2022
Beginner to intermediate
486 pages
10h 22m
Chinese
Content preview from 云端基因组学
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在
Terra
平台自己组装工作区
｜
417
制它，那么系统亦将复制该集合的内容。如果你还想复制受试，你需要将其作为单
独一步来完成，要么勾选复选框选中感兴趣的行，要么用加载文件指定一个受试。
你若把玩“
copy data to workspace
”（复制数据到工作区）功能一会儿，很快就会
意识到该方法非常局限，不适合处理大数据集。为什么？因为表格行数一旦多上来，
要选所有行，即使用表格左上角的全选复选框，系统也只是选取当前页条目。而每
页最多只有一百行数据，因此如要采用“指向—点击”法拷贝一百个样本以上的数据，
另一方法是你的唯一选择。
我们现在就来试试加载文件法。如处理大数据集或复制数据前需调整某些内容，该
方法有优势。
13.3.5
用
TSV
加载文件从千人基因组工作区导入数据
从技术上讲，你已用过该方法，本章前面我们让你从本书原教程工作区复制数据表、
重建自己工作区，用的就是这种方法。当时你选表格、点击“
Download All Rows
”
按钮，检索下载文件，并接着将其导入新工作区。啊，我们的所有样本你都拿到了！
然而这次有点小曲折：我们要复制多张数据表，而其中一些引用了其他数据表。因
此我们需按顺序复制：必须先复制跟其他表没有引用关系的表，因为
Terra
平台无
法处理它从未见过其定义的引用关系。例如，一个样本集引用其他样本，那么在上
传其他样本之前，你无法上传该样本集。该限制令人烦恼，你可能想让系统为其无
法识别的引用创建一个替身。可是我们需在系统的当前状态解决问题，因此底线是：
顺序很重要。我们要解决这一问题。 ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.