javascript - 根据不为零的变化计算事件数

Question

下面的代码当前读取数据集，并将其输入到函数中。它将该列中的值的总和计算到 this.sum 中。现在我想扩展这段代码的功能。

我的数据集有很多 0，后跟一小段值，或“事件”。我想根据我的数据从 0 变为某个值的次数来查找这些“事件”的数量。另外，我希望将少于五个零分隔的事件放在同一个事件中。

因此，对于下面的数据集，我希望它说“发生了 2 个事件。”

我仍想保留“this.sum”，但现在希望存储 this.events。

我习惯了 Python 和 Matlab 等脚本语言，并且对 Javascript 很陌生，因此非常感谢您的帮助!

processData: function(data) {

        // convert our data from the file into an array
        var lines = data.replace(/\n+$/, "").split("\n");

        // we have array of strings but need an array of Numbers this should do the trick getting rid of any text and 0 values (source: http://stackoverflow.com/a/26641971)
        lines = lines.map(Number).filter(Boolean);

        // now we find the sum of all of the values in our array. (source: http://stackoverflow.com/a/16751601)
        this.sum = lines.reduce((a, b) => a + b, 0);
        this.sum = this.sum.toFixed(2);
    },

数据:

0
0
0
0
0
0
0
0
0
.256
.369
.598
.145
.695
.984
.259
.368
.352
0
0
0
0
0
0
0
0
0
0
0
0
.256
.369
.598
.145
.695
.984
.259
.368
.352
0
0
0
0
.256
.369
.598
.145
.695
.984
.259
.368
.352

编辑: 无论我对 count 进行了哪些更改(从 5 更改为 10，再更改为 15)，以下内容为我提供了错误的 ev 值(我的数据集包含的数字与上面给出的数据集。)但是当我将值更改为 500 时，它下降了，因此我将值提高到 12,000，它为我提供了我期望的 this.events 值。

processData: function(data) {

        // convert our data from the file into an array
        var lines = data.replace(/\n+$/, "").split("\n");

var ev = 0; // the event counter (initialized to 0)
for(var i = 0, count = 0; i < data.length; i++) { // 'count' will be the counter of consecutive zeros
  if(lines[i] != 0) { // if we encounter a non-zero line
    if(count > 5) ev++; // if the count of the previous zeros is greater than 5, then increment ev (>5 mean that 5 zeros or less will be ignored)
    count = 1; // reset the count to 1 instead of 0 because the next while loop will skip one zero
    while(++i < lines.length && lines[i] != 0) // skip the non-zero values (unfortunetly this will skip the first (next) zero as well that's why we reset count to 1 to include this skipped 0)
      ;
  }
  else // if not (if this is a zero), then increment the count of consecutive zeros
    count++;
}
this.events = ev;

        // we have array of strings but need an array of Numbers this should do the trick getting rid of any text and 0 values (source: http://stackoverflow.com/a/26641971)
        lines = lines.map(Number).filter(Boolean);

        // now we find the sum of all of the values in our array. (source: http://stackoverflow.com/a/16751601)
        this.sum = lines.reduce((a, b) => a + b, 0);
        this.sum = this.sum.toFixed(2);
    },

Answer 1

var ev = 0; // the event counter (initialized to 0)
for(var i = 0, count = 0; i < lines.length; i++) { // 'count' will be the counter of consecutive zeros
  if(lines[i] != 0) { // if we encounter a non-zero line
    if(count > 5) ev++; // if the count of the previous zeros is greater than 5, then increment ev (>5 mean that 5 zeros or less will be ignored)
    count = 1; // reset the count to 1 instead of 0 because the next while loop will skip one zero
    while(++i < lines.length && lines[i] != 0) // skip the non-zero values (unfortunetly this will skip the first (next) zero as well that's why we reset count to 1 to include this skipped 0)
      ;
  }
  else // if not (if this is a zero), then increment the count of consecutive zeros
    count++;
}
this.events = ev;