26 Matching Annotations
  1. Sep 2020
  2. Aug 2020
  3. May 2020
    1. 通常,Arrays用于两种数据结构:queue和stack。 要了解什么queue是食品,您可以想象在食品商店中有一个普通的队列:新人们在队列的末端加入队列,而刚开始的人们则先离开队列。这就是为什么我们需要两种方法来实现的原因queue:一种在的末尾添加元素,Array而另一种在的开始处删除元素的方法queue。这两种方法是push()将一个或多个元素添加到数组的末尾并返回新的数组长度,并shift()删除数组的第零个元素并返回其值:
    2. The slice() method works only with arrays whose elements are strings, numbers, or boolean values.

      只有字符串,数字,布尔值三种类型的数组可以用 slice 操作

    3. Indexes can also be negative. If you specify a negative index in the first parameter, it will shift the end of the sequence. For example, slice(-4) call will extract the last four elements of the sequence:

      index 可以是复数,arr.slice(-4)代表从倒数第四个值到最后

    4. The slice() method does not change the source array, but returns a copy of the array

      slice()方法是个纯函数

    1. function foo { local -n data_ref=$1 echo ${data_ref[a]} ${data_ref[b]} } declare -A data data[a]="Fred Flintstone" data[b]="Barney Rubble" foo data

      best way to pass associative arrays as function argument in bash

  4. Feb 2020
    1. head(as.data.frame(nasa))#> lat long month year cloudhigh cloudlow cloudmid ozone pressure #> 1 36.20000 -113.8 1 1995 26.0 7.5 34.5 304 835 #> 2 33.70435 -113.8 1 1995 20.0 11.5 32.5 304 940 #> 3 31.20870 -113.8 1 1995 16.0 16.5 26.0 298 960 #> 4 28.71304 -113.8 1 1995 13.0 20.5 14.5 276 990 #> 5 26.21739 -113.8 1 1995 7.5 26.0 10.5 274 1000 #> 6 23.72174 -113.8 1 1995 8.0 30.0 9.5 264 1000 #> surftemp temperature #> 1 272.7 272.1 #> 2 279.5 282.2 #> 3 284.7 285.2 #> 4 289.3 290.7 #> 5 292.2 292.7 #> 6 294.1 293.6

      unrolling a tbl_cube into 2 dimensions (data.frame)

  5. Aug 2019
  6. Jul 2019
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  7. Mar 2018
  8. Jan 2018
  9. Nov 2017
  10. Apr 2017
    1. array with component type int

      My only suggestion is that this should be changed to single-dimension array with component type int. As per the Encoding conventions defined by java.lang.Class#getName()'s contract.

      In other other words, the OP missed the fact that for every dimension of the array-object, an [ character is prepended to the enconding of the type contained in the array.

  11. Mar 2015