Question

我有（y）值的数组。这些值的范围和生成的图形如Graph

我想获取该数组并得到P，Q，R，S和T属性的索引。

如果你想知道这些财产是什么意思。检查此图像以解释数组的哪个部分引用属性：P, Q, R, S, T。

假设我们有一个y值数组，如下所示：

const Data = [
  0, 0, 0, 0, 0.0000050048828125, 0.0000137939453125, 0.000049560546875,
  0.00008740234375, 0.00015966796875, 0.000262451171875, 0.0003975830078125, 0.0005687255859375,
  0.0007802734375, 0.001037353515625, 0.0013468017578125, 0.00172119140625, 0.0021756591796875,
  0.0027232666015625, 0.0033880615234375, 0.004206787109375, 0.0052380371093750005,
  0.006586181640625, 0.008400146484375001, 0.010904296875, 0.0144892578125, 0.0196798095703125,
  0.049684204101562504, 0.0886883544921875, 0.11185363769531251, 0.134164306640625,
  0.137352294921875, 0.1160369873046875, 0.08516308593750001, 0.0539765625,
  0.014997436523437501, -0.015882568359375, -0.0387554931640625, -0.06125732421875, -0.0745780029296875, -0.07479357910156251, -0.0725338134765625, -0.0418538818359375,
  0.08582861328125001, 0.397717529296875, 0.8136408691406251, 1.2295617980957032,
  0.9944150390625001, 0.2824605712890625, -0.38949267578125, -0.597251220703125, -0.425675537109375, -0.1537947998046875, -0.0500914306640625, -0.0111041259765625,
  0.0027451171875, 0.0071739501953125, 0.008443359375, 0.0094327392578125, 0.012530517578125,
  0.0176046142578125, 0.0300162353515625, 0.0433489990234375, 0.056962646484375004,
  0.0704832763671875, 0.0770511474609375, 0.0898175048828125, 0.10311853027343751,
  0.117046142578125, 0.1312630615234375, 0.1529300537109375, 0.167607177734375,
  0.1899068603515625, 0.2124422607421875, 0.235044677734375, 0.2575535888671875,
  0.2724073486328125, 0.286978271484375, 0.3007579345703125, 0.3067425537109375,
  0.3106370849609375, 0.303756103515625, 0.2897236328125, 0.25916931152343753,
  0.2200599365234375, 0.1728209228515625, 0.133416259765625, 0.086224853515625,
  0.05493408203125, 0.02409423828125, 0.00922607421875, -0.0043409423828125, -0.0097349853515625, -0.013127685546875, -0.01423095703125, -0.013834716796875, -0.012556030273437501, -0.010675048828125, -0.00835888671875, -0.0057305908203125, -0.0000562744140625
]

基于上面的值，我想得到属性的索引。

我们有这个框架slayerjs，它基本上可以检测到峰值。但它只返回给定一系列点数的最高峰值。

Answer 1

我的观点：

计算出所有波（向上或向下）并且索引跨越y轴= 0。
从步骤1的结果，我们可以计算出P，Q，R，S。

例如：假设步骤1的结果是一个数组=找到。

如果protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_login); GoogleSignInOptions googleSignInOptions = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN) .requestIdToken(getString(R.string.default_web_client_id)) .requestEmail() .build(); final GoogleApiClient googleApiClient = new GoogleApiClient.Builder(getApplicationContext()) .enableAutoManage(this, new GoogleApiClient.OnConnectionFailedListener() { @Override public void onConnectionFailed(@NonNull ConnectionResult connectionResult) { Log.d("TAG", "Error!"); } }) .addApi(Auth.GOOGLE_SIGN_IN_API, googleSignInOptions) .build(); SignInButton signInButton = findViewById(R.id.sign_in_button); signInButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(googleApiClient); startActivityForResult(signInIntent, RC_SIGN_IN); } }); firebaseAuth = FirebaseAuth.getInstance(); rootRef = FirebaseFirestore.getInstance(); authStateListener = new FirebaseAuth.AuthStateListener() { @Override public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) { FirebaseUser firebaseUser = firebaseAuth.getCurrentUser(); if(firebaseUser != null){ Intent intent = new Intent(LoginActivity.this, MainActivity.class); startActivity(intent); finish(); } } }; }是upwave，found[index]和found[index-1]是downwave，那么我们就知道found[index+1]是一个Q.

以下是代码：

＆＃13;

found[index]

＆＃13;

如何在javascript中检测给定1D数组中的峰值？

1 个答案: