大约有 6,887 项符合查询结果（耗时：0.0292秒） [XML]
How to find the last field using 'cut'
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-F if for field separator
NF is the number of fields (also stands for the index of the last)
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Using R to download zipped data file, extract, and import data
...ge "downloader" found at http://cran.r-project.org/web/packages/downloader/index.html . Much easier.
download(url, dest="dataset.zip", mode="wb")
unzip ("dataset.zip", exdir = "./")
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Write applications in C or C++ for Android? [closed]
...e Development Kit) from here:
https://developer.android.com/ndk/downloads/index.html
Also there is an blog post about the NDK:
http://android-developers.blogspot.com/2009/06/introducing-android-15-ndk-release-1.html
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Easy way to concatenate two byte arrays
...arantees that the zeroeth position in the bytebuffer always corresponds to index 0 of the byte array. See here. I solve this by issuing bb.flip(); bb.get(result); in stead of the byte[] result = bb.array(); line.
– DarqueSandu
May 11 '15 at 12:58
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Pandas: Setting no. of max rows
...display
import numpy as np
import pandas as pd
n = 100
foo = pd.DataFrame(index=range(n))
foo['floats'] = np.random.randn(n)
with pd.option_context("display.max_rows", foo.shape[0]):
display(foo)
pandas.option_context is available since pandas 0.13.1 (pandas 0.13.1 release notes).
According ...
Parsing query strings on Android
...e.g.:
import org.eclipse.jetty.util.*;
URL url = new URL("www.example.com/index.php?foo=bar&bla=blub");
MultiMap<String> params = new MultiMap<String>();
UrlEncoded.decodeTo(url.getQuery(), params, "UTF-8");
assert params.getString("foo").equals("bar");
assert params.getString("bla...
Deserializing a JSON into a JavaScript object
...unction () {
inner = this;
$.each(inner, function (index) {
alert(this.text)
});
});
}
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How can I add a column that doesn't allow nulls in a Postgresql database?
...is also particularly problematic if the table is referenced by foreign key indexes as those would all have to be recreated as well.
– Aryeh Leib Taurog
Nov 24 '15 at 13:54
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SQL WHERE ID IN (id1, id2, …, idn)
...this other table, insert your large number of rows, then perhaps create an index to aid the join performance. It would also let you detach the accumulation of these rows from the retrieval of data, perhaps giving you more options to tune performance.
Update: Although you could use a temporary table...
Convert command line arguments into an array in Bash
...ay, i.e. ${var[0]} ${var[1]} ... ${var[n]} (with nbeing the last element's index)?
– Christian
Sep 21 '16 at 18:27
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