C语言寻找波峰值

山间朝暮-CanEve2024-08-13 16:31

做到项目有需要压力采集的处理，为了便于在程序中计算采集的波形数据，这里简单写一个查找波峰的程序

首先用Python把波峰点找出来，

方便我们对照

我这里主要是判断波峰，波谷的原理也大同小异，改一下程序就行

波峰判断条件就是：前一段上升，后一段下降，并且本身是这段点的最大值（波谷就找最小值）

判断是否是上升段（从左往右看），

其中top_width是判断的取样长度，judg_rate相当于是一个阈值，因为波形并不是完全理想的

cpp 复制代码 
int is_rise(float *ydata,int index,int size,int *max,int *min){//左侧上升 
	int tempi=0,sum=0,judg_len,start_index;
	*max=index;
	*min=index;
	judg_len = (index <= top_width ? index==0 ? 0 : index : top_width-1);
	start_index = (index <= top_width )? 0 : index-top_width;
//	printf("len %d start %d\n",judg_len,start_index);
	for(tempi = start_index ; tempi< (judg_len+start_index);tempi++ ){
		if(judg_len<=0) break;
//		printf("index %d max %d min %d\n",tempi,*max,*min);
		if(ydata[tempi] < ydata[tempi+1] ) sum++;
		if(ydata[tempi] > ydata[tempi+1] ) sum--;
		if(ydata[*max]<ydata[tempi]) *max = tempi;
		if(ydata[*min]>ydata[tempi]) *min = tempi;
		if(ydata[*max]<ydata[tempi+1]) *max = tempi+1;
		if(ydata[*min]>ydata[tempi+1]) *min = tempi+1;
	} 

	if(sum>judg_len*judg_rate&&judg_len>0) return 1;
	if(sum<judg_len*judg_rate&&judg_len>0) return -1;
	return 0;
}

然后是判断下降段（从左往右），

原理和判断上升差不多

cpp 复制代码 
int is_drop(float *ydata,int index,int size,int *max,int *min){//右侧下降 
	int tempi=0,sum=0,judg_len,start_index;
	*max=index;
	*min=index;
	judg_len = (index >= size-1-top_width ? size-index-2 : top_width-1);
	start_index = index;
//	printf("len %d start %d\n",judg_len,start_index);
	for(tempi = index; tempi< judg_len+start_index;tempi++ ){
		if(judg_len<=0) break;
//		printf("index %d max %d min %d\n",tempi,*max,*min);
		if(ydata[tempi] > ydata[tempi+1] ) sum++;
		if(ydata[tempi] < ydata[tempi+1] ) sum--;
		if(ydata[*max]<ydata[tempi]) *max = tempi;
		if(ydata[*min]>ydata[tempi]) *min = tempi;
		if(ydata[*max]<ydata[tempi+1]) *max = tempi+1;
		if(ydata[*min]>ydata[tempi+1]) *min = tempi+1;
	} 
	if(sum>judg_len*judg_rate&&judg_len>0) return 1;
	if(sum<judg_len*judg_rate&&judg_len>0) return -1;
	return 0;
}

然后是判断是否是波峰，

依据就是前段上升，后段下降，并且是最大值

cpp 复制代码 
int is_top(float *ydata,int index,int size){
	int max_d,min_d,max_r,min_r; 
	if(is_drop(ydata,index,size,&max_d,&min_d)==1&&is_rise(ydata,index,size,&max_r,&min_r)==1&&max_d==max_r) {
		return 1;
	}
	
	return 0;
}

如果要找一系列波峰点

，就直接添加到数组中，使用realloc扩展内存空间

cpp 复制代码 
int find_wave_top(float *ydata, int size,int *top_array){
	int top_array_size=0; 
	for(temp_i[1]=0;temp_i[1]<size;temp_i[1]++){
		if(is_top(ydata,temp_i[1],size)/*&&(top_array_size>0 ? ydata[top_array[top_array_size-1]]!= ydata[temp_i[1]]: 1)*/){//是一个波峰 ,并且不是和上一个的值相同。即只取第一个值 
			top_array = (int *) realloc(top_array, (top_array_size+1)*sizeof(int));
			top_array_size++;
			top_array[top_array_size-1] = temp_i[1];
			
		}
	}
	return top_array_size;
}

在最后主函数调用

cpp 复制代码 
int main(){
	int *top_array = (int *) malloc(sizeof(int)),array_len,min,max,isris;
	data_len = sizeof(ydata)/sizeof(float);
//	printf("y size %d\n",data_len);
	xdata=(float*)malloc(sizeof(float) * data_len);
	for(temp_i[0]=0;temp_i[0]<data_len;temp_i[0]++){
		xdata[temp_i[0]] = temp_i[0];
	}
	array_len = find_wave_top(ydata,data_len,top_array);
	printf("array len %d\n",array_len);
	for(temp_i[0]=0;temp_i[0]<array_len;temp_i[0]++){
		printf("index  %d value %.1f \n",top_array[temp_i[0]],ydata[top_array[temp_i[0]]]);
	}
	return 0;
}

如果不取消注释，就会找到相同值的波峰点，和Python对比可以发现，Python的是取中间的值作为波峰，我这里如果取消注释，则只取第一个作为波峰，如果需要中间的可以自行更改

取消注释后，消除重复值的效果

最后是一些变量的创建，以及测试数据

cpp 复制代码 
#include "stdio.h" 
#include "string.h"
#include "stdlib.h"
#include "math.h"
float 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3,98.774849,98.774849,98.774849,98.774849,98.774849,98.525696,98.525696,98.525696,98.525696,98.525696,98.525696,98.525696,98.525696,98.279343,98.279343,98.279343,98.279343,98.279343,98.030190,98.030190,98.030190,98.030190,98.030190,98.030190,98.030190,97.779182,97.779182,97.779182,97.779182,97.779182,97.524361,97.524361,97.524361,97.524361,97.524361,97.524361,97.524361,97.524361,97.270500,97.270500,97.270500,97.270500,97.270500,97.023247,97.023247,97.023247,97.023247,97.023247,97.023247,97.023247,96.780647,96.780647,96.780647,96.780647,96.780647,96.539955,96.539955,96.539955,96.539955,96.539955,96.539955,96.539955};
//float ydata[]={1,2,3,4,5,6,7,8,7,6, 5,4,3,2,1,0,1,2,3,4,5,6,7,8,9,8,7,6,5,4,3};
float *xdata;

#define top_width 50 //判断波峰的宽度 
#define judg_rate 0.1//判断阈值

int data_len,temp_i[10];

完整程序：

opencaneve: 开源STM32HAL ESP8266 ESP32 python Android Windows把我学习到的以及找到的可以用的代码分享出来python记录打卡信息 ESP32蓝牙鼠标 开源windows串口助手 - Gitee.com

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