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R - Markdown avoiding package loading messages
...clude=FALSE,}
knitr::opts_chunk$set(echo = TRUE, warning=FALSE)
#formating tables
library(xtable)
#data wrangling
library(dplyr)
#text processing
library(stringi)
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Green Bars in Visual Studio 2010
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They show lines that you have changed.
See here for more details and a table showing what the different colours mean:
+-----------+------------------------------+-------------------------+
| Marker | Different from | Different from file |
| colour | file saved on d...
Boolean.hashCode()
...mbers (non-primes), say 1000 and 2000. When inserting booleans into a hash table, true and false would go into bucket 1000 % N resp 2000 % N (where N is the number of buckets).
Now notice that
1000 % 8 same bucket as 2000 % 8
1000 % 10 same bucket as 2000 % 10
1000 % 20 same bucket as 2000 % 20...
what is the difference between XSD and WSDL
... calls to fetch data from servicer and convert data returned into their suitable requirement and then display or publish data or information about the product on their website. A simple example would be FLIGHT Ticket booking. An airline will let third parties to use flight data on their site for tic...
Status bar and navigation bar appear over my view's bounds in iOS 7
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Also note that when your main view is a UITableView the viewDidLayoutSubviews will get called on each scroll. Your UITableView will be scaled down until its height is 15px. Add a flag to only run this code once. ;)
– Thomas Johannesmeyer
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How was the first compiler written?
... possible to write a program in opcodes directly by looking them up from a table (such as this one for the 6039 microprocessor, for example) that lists them with the matching assembly instructions, and hand-determining memory addresses/offsets for things like jumps.
The first programs were done in ...
rotating axis labels in R
...n, but try setting las=1. Here's an example:
require(grDevices)
tN <- table(Ni <- stats::rpois(100, lambda=5))
r <- barplot(tN, col=rainbow(20), las=1)
That represents the style of axis labels. (0=parallel, 1=all horizontal, 2=all perpendicular to axis, 3=all vertical)
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Entity framework code-first null foreign key
...y { get; set; }
}
Because EF was creating 2 foreign keys in the database table: CountryId, and CountryId1, but the code above fixed that.
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内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...socket，16 real cores， 开启hyper-threading， 总共32个vcpu。 16个table，每个5M row。
OLTP_RO测试包含5个select查询：select_ranges, select_order_ranges, select_distinct_ranges, select_sum_ranges,
可以看到在多核心或者多线程的场景下， jemalloc和tcmalloc带来...
LEN function not including trailing spaces in SQL Server
I have the following test table in SQL Server 2005:
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