所以这就是今天的伎俩。我正在读取字符串数字的文本文件数组。它大约有4000多个数字 - 基于我的压力传感器。我已经跟踪了我的代码很好，然后我做了简单的算法来找到所有的最大值。该阵列中的峰值。我在matlab中做了相同的算法，我跳过每5个元素 If（i％5 == 0）{//当它大于0时找到峰值它运行得很好在matlab中，我确实找到了所有峰的局部最大值。 （但由于噪音不是不需要的峰值 - 我不需要它们）。我还通过说 if（dataOfArray＆gt; 170）{//确实找到170以上的每个峰值来过滤数组。然而，我在matlab中有11个峰值而我在java android中有22个峰值。注意代码是相同的，如果有smthg错误我没有注意到。就像matlab索引从1开始，而java从0开始。我希望有人可以告诉我为什么我的java代码不像matlab那样表现。我必须得到同样的结果。希望。
clear all
close all
clc
x=load('string.txt');
tmax=(length(x)-1)/100;
t1_n=0:0.05:tmax;
x4 = x(1:5:end);
x1_n_ref=0;
k=0;
for i=1:length(t1_n)
if x4(i)>170
if x1_n_ref-x4(i)<0
x1_n_ref=x4(i);
alpha=1;
elseif alpha==1 && x1_n_ref-x4(i)>0
k=k+1;
peak(k)=x1_n_ref;
peak_time(k)=t1_n(i-1);
alpha=2;
else
end
else
x1_n_ref=0;
end
end
figure(1)
hold on
plot(t1_n,x4,'b');
//Java code.
//Read data.
Recall = (Button) findViewById(R.id.Recall);
Recall.setOnClickListener(new View.OnClickListener() {
StringBuilder stringBuilder = new StringBuilder();;
boolean bTt = false;
String line = null;
@Override
public void onClick(View v) {
//readTextFile(this, R.raw.books);
try {
FileInputStream fIn = new FileInputStream(file);
BufferedReader bufferedreader = new BufferedReader(new InputStreamReader(fIn));
while ((line = bufferedreader.readLine()) != null) {
stringBuilder.append(line).append(" ");
stringBuilder.length();
Toast.makeText(getApplicationContext(), "Data_Read_number: " + stringBuilder.capacity(), Toast.LENGTH_SHORT).show();
// Log.i(TAG, "Capacity" + stringBuilder.capacity());
}
bufferedreader.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
String Adata = String.valueOf(stringBuilder);
// find the peaks
String dataArray[];
dataArray = Adata.split("\\s+");
List String_TO_List = new ArrayList<Float>();
boolean bstart = false;
int lastLength = dataArray.length -1;
for(int i=0;i<lastLength;i++){
float dataOfArray = Float.parseFloat(dataArray[i]);
if (dataOfArray>170){
bstart = true;
}else {
bstart = false;
}
if (bstart){
//take String i from dataArray, convert it to a float with Float.parseFloat, then add it to your list
String_TO_List.add(dataOfArray);
}
}
List<Integer> List_Of_Peaks = findPeaks(String_TO_List);
// List a = findPeaks(aa);
Log.i(TAG,"Peaks"+ List_Of_Peaks);
// DataAlert alert = new DataAlert();
// alert.show(getFragmentManager(), "DataAlert");
// Peaks_value.setText(a.toString());
// Toast.makeText(getApplicationContext(),
// "Number of peaks:" + List_Of_Peaks, Toast.LENGTH_SHORT).show();
Peaks_num.setText(String.valueOf(List_Of_Peaks));
}
});
}//end OnCreate().
public static ArrayList<Float> findPeaks(List<Float> points)
{
if (points== null || points.size() < 1)
return null;
ArrayList<Float> peaks = new ArrayList<Float>();
float x1_n_ref = 0;
int alpha = 0;
int size = points.size();
for (int i = 0; i <size ; i++) {
float IndexValues = points.get(i);
if(i%5 == 0 ){
if (x1_n_ref - IndexValues < 0) {
x1_n_ref = points.get(i);
alpha = 1;
} else if (alpha == 1 && x1_n_ref - points.get(i) > 0) {
peaks.add(x1_n_ref);
alpha = 0;
}else {
x1_n_ref = 0;
}
}
}
return peaks;
}