使用 JQ 时如何将计算值添加到导出的 csv？

如何解决使用 JQ 时如何将计算值添加到导出的 csv？

我有下面这样的json数据

{"lastUpdateId":18891938,"bids":[
    ["1","50"],["2","40"],["3","30"],["4","20"],["5","10"]
],"asks":[
    ["6","10"],["7",["8",["9",["10","50"]
]}

那么下面的代码就可以像这样导出CSV的结果

jq -r keys[] as $k  | select(.[$k]|type=="array")  | [$k]+.[$k][] | .[length]= (.[-2:]|map(tonumber)|.[0]*.[1]) |@csv

结果：

"asks","6","10",60
"asks","7","20",140
"asks","8","30",240
"asks","9","40",360
"asks","50",500
"bids","1",50
"bids","2",80
"bids","3",90
"bids","4","5",50

如果我想要其他列作为所有询问的最小值（这里是 6）怎么办？， 每次要价和出价的金额，以及与每次要价和出价的金额的比率？

所以我想要这样的 CSV 结果（第 4-6 列是我想要的新数据）

asks,6,10,60,1300,0.046153846
asks,7,20,140,0.107692308
asks,8,30,240,0.184615385
asks,9,40,360,0.276923077
asks,50,500,0.384615385
bids,1,350,0.142857143
bids,2,80,0.228571429
bids,3,90,0.257142857
bids,4,5,0.142857143

6 is minimum value for asks. 1300 is total sum for asks(60,500),350 is total sum for bids(50,50),and the last values for each line is ratio(4th col/6th col)

https://jqplay.org/s/2Qsdopx8A4

解决方法

首先是一个辅助函数：

def mul: (.[0]|tonumber) * (.[1]|tonumber);

接下来，我们可以通过首先计算“ask”值的最小值来调整您提到的解决方案：

  ([.asks[][] | tonumber] | min) as $min
  | keys[] as $k 
  | select(.[$k]|type=="array")
  | ([.[$k][] | mul] | add) as $sum
  | [$k]+.[$k][] 
  | (.[-2:]|mul) as $c4
  | . + [$c4,$min,$sum,$c4 / $sum]
  | @csv

要消除数值的引号，您可以使用 tonumber。要消除所有引号，您可以将调用 @csv 替换为调用 join(",")，但结果不能保证是您期望的 CSV。