## functions – why this simple code is not giving the right answer under Compile

I have two sets of inputs that are to be fed to a simple function. The inputs are essentially a set of triangles and the normal for each triangle. The function will compute the gradient about the points (shown in blue). The notebook can be downloaded from the following `Dropbox` Link

https://www.dropbox.com/s/yas32nfccd2dzj4/debug%20code.nb?dl=0

The two sets of triangles are supposed to be similar (only separated by a translation in space). I compute the area gradient about point `pt1`

`````` grad1 = Block({ptTri, normal, cross, target, facept,
openS = {0., 0., 0.}, closedS = {0., 0., 0.}, source = pt1},
Do(
ptTri = opentr1((i));
normal = normOpentr1((i));
cross = If(ptTri((1)) == source,
{target, facept} = {ptTri((2)), ptTri((-1))};
Cross(normal, facept - target),
{target, facept} = {ptTri((1)), ptTri((-1))};
Cross(normal, target - facept)
);
openS += (0.5*cross), {i, 1, Length@normOpentr1});

Do(
ptTri = closedtri1((j));
normal = normClosedtr1((j));
cross = If(ptTri((1)) == source,
{target, facept} = {ptTri((2)), ptTri((-1))};
Cross(normal, facept - target),
{target, facept} = {ptTri((1)), ptTri((-1))};
Cross(normal, target - facept)
);
closedS += (0.5*cross), {j, 1, Length@normClosedtr1});
0.7*closedS + 1*openS
)

(*{0.110728, 0.0466838, 0.752509}*)
``````

Likewise if I compute the area gradient about the second point `pt2` I get the same answer.

``````grad2 = Block({ptTri, normal, cross, target, facept,
openS = {0., 0., 0.}, closedS = {0., 0., 0.}, source = pt2},
Do(
ptTri = opentr2((i));
normal = normOpentr2((i));
cross = If(ptTri((1)) == source,
{target, facept} = {ptTri((2)), ptTri((-1))};
Cross(normal, facept - target),
{target, facept} = {ptTri((1)), ptTri((-1))};
Cross(normal, target - facept)
);
openS += (0.5*cross);, {i, 1, Length@normOpentr2});
Do(
ptTri = closedtr2((j));
normal = normClosedtr2((j));
cross = If(ptTri((1)) == source,
{target, facept} = {ptTri((2)), ptTri((-1))};
Cross(normal, facept - target),
{target, facept} = {ptTri((1)), ptTri((-1))};
Cross(normal, target - facept)
);
closedS += (0.5*cross),{j, 1, Length@normClosedtr2});
0.7*closedS + 1*openS
)

(*{0.110728, 0.0466838, 0.752509}*)
``````

The two answers are quite similar as the difference between `grad1` and `grad2` is `{1.83187*10^-15, -5.55112*10^-16,4.44089*10^-16}`

HOWEVER

the same code when under `Compile` does not give the same answers for the two datasets.

``````With({epcc = 0.7, epco = 1.},
Compile({{point, _Real, 1}, {opentr, _Real, 3}, {normalO, _Real,2}, {closedtr, _Real, 3}, {normalC,
_Real, 2}},
Block({ptTri, source = point, normal, target, facept, cross,
openS = {0., 0., 0.}, closedS = {0., 0., 0.}, nO = normalO,
nC = normalC, OT = opentr, CT = closedtr},
Do(
ptTri = OT((i));
normal = nO((i));
cross = If(ptTri((1)) == source,
{target, facept} = {ptTri((2)), ptTri((-1))};
Cross(normal, facept - target),
{target, facept} = {ptTri((1)), ptTri((-1))};
Cross(normal, target - facept)
);
openS += (0.5*cross);
, {i, 1, Length@nO});
Do(
ptTri = CT((j));
normal = nC((j));
cross = If(ptTri((1)) == source,
{target, facept} = {ptTri((2)), ptTri((-1))};
Cross(normal, facept - target),
{target, facept} = {ptTri((1)), ptTri((-1))};
Cross(normal, target - facept)
);
closedS += (0.5*cross);
, {j, 1, Length@nC});

epcc*closedS + epco*openS
), CompilationTarget -> "C")
);
``````

Though the structure of the code is the same I guess, the outputs are completely different.

`````` surfaceGradFn2(pt1, opentr1, normOpentr1, closedtri1, normClosedtr1)
(*{-0.0157582, 0.386426, 0.582118} -> this answer is now different but I gave the same inputs as before *)

(* {0.110728, 0.0466838, 0.752509} -> answer is same as before with the same inputs *)
``````

What am I doing wrong here? Why does not the compiled code work while the non-compiled version works? I wish to have the compiled version of the code working.

also, please ignore what the code intends to do. If you may, kindly look at why the compiled output is different.Thanks and grateful for your help.

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## plotting – Why code is running and not giving any output for NSolve?

I am trying to solve the given equation in the code and want to plot ‘N1’ with ‘P1’. But the code is not giving me any output and still showing running. What is the problem with it?
If anyone can figure it out will be appreciated.

``````dela = -1.5;(*Subscript((CapitalDelta), L) ; Laser-Lower polariton
detuning*)
g1 = 0.0003; (* Subscript(g, 0) ; vacuum optomechanical strength *)
del0 = -0.006; (* (Delta) ;  exciton-photon detuning*)
ome = 3.014; (* (CapitalOmega) ; Rabi splitting *)
omem = 0.125; (* Subscript((CapitalOmega), m) ; mechanical
resonator's frequency *)
kexc = 0.002;  (* Subscript((Kappa), exc  ;  )exciton decay rate*)
kk = .2;   (* (Kappa); cavity decay rate *)
gma = 0.00001;  (* (CapitalGamma) ; phonon dcay rate *)
nth = 0;
kal = (kk + kexc)/2 - del0*(kk - kexc)/(2*ome);
g0 = g1*(1 - del0/ome)/2;
kb = 0.1;
sol = NSolve({-I*(P1/Sqrt(2)*(1 - del0/(2*ome)))*(Conjugate(a1) -
a1) - I*(P1*g1/(2*Sqrt(2)*ome))*(alab - Conjugate(alab) +
Conjugate(betab) - betab) + kal*N1 +
kb*(alab*a1 + Conjugate(alab)*Conjugate(a1) +
betab*Conjugate(a1) +
Conjugate(betab)*
a1 + (N1 - 2*(Abs(a1))^2)*(b1 + Conjugate(b1))) == 0,
I*dela*alab + I*omem*alab -
I*g0*((2*N1 - Abs(a1)^2 - Np + 2*2*(Abs(b1))^2 + b1^2)*
Conjugate(a1) - (Conjugate(betab) + 2*alab)*b1 -
alab*Conjugate(b1)) + I*(P1/Sqrt(2)*(1 - del0/(2*ome)))*b1 -
I*(P1*g1/(2*Sqrt(2)*ome))*(N1 - Np + (Conjugate(a1))^2 -
b1^2) + (kal + gma)*alab/2 +
kb/2*(Conjugate(betab)*b1 +
alab*Conjugate(b1) + (Np - 2*(Abs(b1))^2)*Conjugate(a1) +
2*alab*b1 - b1^2*Conjugate(a1)) ==
0, -I*g0*((N1 - 2*(Abs(a1))^2)*(Conjugate(b1) - b1) +
Conjugate(alab)*Conjugate(a1) - alab*a1 +
Conjugate(betab)*a1 - betab*Conjugate(a1)) -
I*(P1*g1/(2*Sqrt(2)*ome))*(Conjugate(betab) - alab +
Conjugate(alab) - betab) + gma*Np - gma*nth == 0,
-I*dela*betab + I*omem*betab -
I*g0*((2*N1 - (Abs(a1))^2 + Np - 2*(Abs(b1))^2)*
a1 - (2*betab - a1*b1 + Conjugate(alab))*b1 +
betab*Conjugate(b1)) - I*(P1/Sqrt(2)*(1 - del0/(2*ome)))*b1 -
I*(P1*g1/(2*Sqrt(2)*ome))*(N1 + Np + a1^2 + b1^2 + 1) + (kal +
gma)*betab/2 +
kb/2*((2*betab - a1*b1 + Conjugate(alab))*
b1 + (Np - 2*(Abs(b1))^2)*a1 + betab*Conjugate(b1)) == 0,
-I*dela*a1 - I*g0*(Conjugate(alab) + betab) -
I*(P1/Sqrt(2)*(1 - del0/(2*ome))) -
I*(P1*g1/(2*Sqrt(2)*ome))*(b1 + Conjugate(b1)) + kal*a1/2 +
kb*(Conjugate(alab) + betab)/2 == 0,
I*omem*b1 - I*g0*N1 -
I*(P1*g1/(2*Sqrt(2)*ome))*(a1 + Conjugate(a1)) + gma*b1/2 ==
0}, {N1, alab, Np, betab, a1, b1});
Plot({Evaluate(N1) /. sol}, {P1, 0, 20})
``````

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I installed yoast seo on a wordpress website that is on the nginx web server, but when i clicked the xml sitemap link it shows 404 not found error. Any suggestions to solve this?

## android studio – Problems with Recycler View – 100% in AVD, giving CRASH when run in SMARTPHONE;

Guys, I'm new here, I have an application that I develop based on a course, the problem is that it has a recycler view that when I run the application on the AVD it works 100%, but when I run it on the smartphone it blocks the application, I am really looking for help, because I have tried everything possible;

ACTIVITY CODE CALLING THE RECYCLER

Public class RequisicoesActivity extends AppCompatActivity {

``````//Componentes
private RecyclerView recyclerRequisicoes;

private FirebaseAuth autenticacao;
private DatabaseReference firebaseRef;
private List listaRequisicoes = new ArrayList<>();
private Usuario motorista;

private LocationManager locationManager;
private LocationListener locationListener;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_requisicoes);

inicializarComponentes();

//Recuperar localizacao do usuário
recuperarLocalizacaoUsuario();

}

@Override
protected void onStart() {
super.onStart();
verificaStatusRequisicao();
}

private void verificaStatusRequisicao(){

DatabaseReference firebaseRef = ConfiguracaoFirebase.getFirebaseDatabase();

DatabaseReference requisicoes = firebaseRef.child("requisicoes");

Query requisicoesPesquisa = requisicoes.orderByChild("motorista/id")

@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for( DataSnapshot ds: dataSnapshot.getChildren() ){

Requisicao requisicao = ds.getValue( Requisicao.class );

if( requisicao.getStatus().equals(Requisicao.STATUS_A_CAMINHO)
|| requisicao.getStatus().equals(Requisicao.STATUS_VIAGEM)
motorista = requisicao.getMotorista();
abrirTelaCorrida(requisicao.getId(), motorista, true);
}

}
}

@Override
public void onCancelled(DatabaseError databaseError) {

}
});

}

private void recuperarLocalizacaoUsuario() {

locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {

//recuperar latitude e longitude
String latitude = String.valueOf(location.getLatitude());
String longitude = String.valueOf(location.getLongitude());

//Atualizar GeoFire
location.getLatitude(),
location.getLongitude()
);

if( !latitude.isEmpty() && !longitude.isEmpty() ){
motorista.setLatitude(latitude);
motorista.setLongitude(longitude);

}

}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {

}

@Override
public void onProviderEnabled(String provider) {

}

@Override
public void onProviderDisabled(String provider) {

}
};

//Solicitar atualizações de localização
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED ) {
LocationManager.GPS_PROVIDER,
0,
0,
locationListener
);
}

}

@Override
return true;
}

@Override

switch (item.getItemId()){
autenticacao.signOut();
finish();
break;
}

return super.onOptionsItemSelected(item);
}

private void abrirTelaCorrida(String idRequisicao, Usuario motorista, boolean requisicaoAtiva){
Intent i = new Intent(RequisicoesActivity.this, CorridaActivity.class );
i.putExtra("idRequisicao", idRequisicao );
i.putExtra("motorista", motorista );
i.putExtra("requisicaoAtiva", requisicaoAtiva );
startActivity( i );
}

private void inicializarComponentes(){

getSupportActionBar().setTitle("Requisições");

//Configura componentes
recyclerRequisicoes = findViewById(R.id.recyclerRequisicoes);

//Configurações iniciais
autenticacao = ConfiguracaoFirebase.getFirebaseAutenticacao();
firebaseRef = ConfiguracaoFirebase.getFirebaseDatabase();

//Configurar RecyclerView
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
recyclerRequisicoes.setLayoutManager( layoutManager );
recyclerRequisicoes.setHasFixedSize(true);

recuperarRequisicoes();

}

//Adiciona evento de clique no recycler
new RecyclerItemClickListener(
getApplicationContext(),
recyclerRequisicoes,
new RecyclerItemClickListener.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
Requisicao requisicao = listaRequisicoes.get(position);
abrirTelaCorrida(requisicao.getId(), motorista, false);
}

@Override
public void onLongItemClick(View view, int position) {

}

@Override
public void onItemClick(AdapterView parent, View view, int position, long id) {

}
}
)
);

}

private void recuperarRequisicoes(){

DatabaseReference requisicoes = firebaseRef.child("requisicoes");

Query requisicaoPesquisa = requisicoes.orderByChild("status")
.equalTo(Requisicao.STATUS_AGUARDANDO);

@Override
public void onDataChange(DataSnapshot dataSnapshot) {

if( dataSnapshot.getChildrenCount() > 0 ){
recyclerRequisicoes.setVisibility( View.VISIBLE );
}else {
recyclerRequisicoes.setVisibility( View.GONE );
}

listaRequisicoes.clear();
for ( DataSnapshot ds: dataSnapshot.getChildren() ){
Requisicao requisicao = ds.getValue( Requisicao.class );
}

}

@Override
public void onCancelled(DatabaseError databaseError) {

}
});

}
``````

}

XML – RECYCLER

LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android"
android: layout_width = "match_parent"
android: layout_height = "wrap_content"
android: orientation = "vertical"

``````

``````

``````public class RequisicoesAdapter extends RecyclerView.Adapter {

private List requisicoes;
private Context context;
private Usuario motorista;

public RequisicoesAdapter(List requisicoes, Context context, Usuario motorista) {
this.requisicoes = requisicoes;
this.context = context;
this.motorista = motorista;
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View item = LayoutInflater.from(parent.getContext()).inflate(R.layout.adapter_requisicoes, parent, false);
return new MyViewHolder( item ) ;
}

@Override
public void onBindViewHolder(MyViewHolder holder, int position) {

Requisicao requisicao = requisicoes.get( position );
Usuario passageiro = requisicao.getPassageiro();

holder.nome.setText( passageiro.getNome() );

if(motorista!= null){

LatLng localPassageiro = new LatLng(
Double.parseDouble(passageiro.getLatitude()),
Double.parseDouble(passageiro.getLongitude())
);

LatLng localMotorista = new LatLng(
Double.parseDouble(motorista.getLatitude()),
Double.parseDouble(motorista.getLongitude())
);
float distancia = Local.calcularDistancia(localPassageiro, localMotorista);

}

}

@Override
public int getItemCount() {
return requisicoes.size();
}

public class MyViewHolder extends RecyclerView.ViewHolder{

TextView nome, distancia;

public MyViewHolder(View itemView) {
super(itemView);

nome = itemView.findViewById(R.id.textRequisicaoNome);
distancia = itemView.findViewById(R.id.textRequisicaoDistancia);

}
}
``````

}
AID CODE – ACTIVITY

RecyclerItemClickListener public class implements RecyclerView.OnItemTouchListener {

``````    private OnItemClickListener mListener;
GestureDetector mGestureDetector;

@Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View childView = rv.findChildViewUnder(e.getX(), e.getY());
if (childView != null && mListener != null && mGestureDetector.onTouchEvent(e)) {
return true;
}
return false;
}

@Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {

}

@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

}

public interface OnItemClickListener extends AdapterView.OnItemClickListener {
void onItemClick(View view, int position);

void onLongItemClick(View view, int position);
}

public RecyclerItemClickListener(Context context, final RecyclerView recyclerView, OnItemClickListener listener) {
mListener = listener;
mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}

@Override
public void onLongPress(MotionEvent e) {
View child = recyclerView.findChildViewUnder(e.getX(), e.getY());
if (child != null && mListener != null) {
}
}
});

}
}
``````

THANKS FROM WHO CAN HELP ME

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## unity – Random.range giving me the same value at the same time

I created a random address on the x and y axes where to move, so my problem is that when I try to randomize it I sometimes get the same value at the same time on the x and y axes. How can I not let this happen, I just want an axis to have a value, not both?

ERROR

HOW I WANT IT TO HAPPEN

CODE

``````public Vector2 randomDirection;

void Awake()
{
}

void Update()
{
randomDirection = new Vector2(Random.Range(-1, 2), Random.Range(-1, 2));
}
``````