// 获取数据集的特殊点
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function getSpecialPointIndex(data) {
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let rs = {
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code: 0, // 标识是否找到驼峰锅底
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min: -Infinity, // 锅底所在的点
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minVal: 0,
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max: Infinity, // 驼峰所在的点
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maxVal: 0,
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};
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if(data.length < 20) {
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rs.code = 0;
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return rs;
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}
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for(let i=0; i<data.length; i++) {
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let item = data[i];
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// 检查当前点是否为锅底
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if(rs.min == -Infinity) {
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let isLow = true;
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for(let k=i-3; k<=i+3; k++) {
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if(k==i) {
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continue;
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}
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if(data[k] == undefined || data[k]<item) {
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rs.min = -Infinity;
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isLow = false;
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break;
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}
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}
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if(isLow) {
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rs.min = i;
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rs.minVal = item;
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}
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}
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// 检查是否为驼峰
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if(rs.min != -Infinity && rs.max == Infinity) {
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let isHigh = true;
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for(let k=i-2; k<=i+2; k++) {
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if(k==i) {
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continue;
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}
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if(data[k] == undefined || data[k]>=item) {
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rs.max = Infinity;
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isHigh = false;
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break;
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}
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}
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if(isHigh) {
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rs.max = i;
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rs.maxVal = item;
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}
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}
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}
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if(rs.min != -Infinity && rs.max == Infinity) {
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let index = data.length - 10;
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rs.max = index;
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rs.maxVal = data[index];
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}
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// 未找到锅底
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if(rs.min == -Infinity) {
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rs.code = 0;
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}else {
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rs.code = 1;
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}
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// 驼峰出现在锅底的前面
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if(rs.max < rs.min) {
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rs.code = 0;
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}
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return rs;
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}
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export default getSpecialPointIndex;
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