index to iterator

[m_schellens]

How can I get from a vector index the iterator?

typedef std::vector< doubleT> doubleV;

doubleV xV;
doubleV yV;

// fill xV and yV with values (they have the same size)
....


for( SizeT i=0; i<yV->size(); ++i)
{
if( (*yV)[ i] <= 0.0)
{
yV->erase( ***what? ***); // want to erase yV
xV->erase( ***what? ***); // want to earse xV
}
}


I know I could iterate through an iterator.
But to much typing for xV then.

Thanks,
Marc

 

[Thomas Tutone]

How can I get from a vector index the iterator?

typedef std::vector< doubleT> doubleV;

doubleV xV;
doubleV yV;

// fill xV and yV with values (they have the same size)
...


for( SizeT i=0; i<yV->size(); ++i)

I think you mean:

for (doubleV::size_type i = 0; i<yV.size(); ++i)

{
if( (*yV)[ i] <= 0.0)

I think you mean:

if (yV<=0.0)

{
yV->erase( ***what? ***); // want to erase yV

yV.erase(yV.begin() + i);

xV->erase( ***what? ***); // want to earse xV
}
}


I know I could iterate through an iterator.

Yes, that would make this easier and clearer.

But to much typing for xV then.

I don't understand what you mean.

Best regards,

Tom

 

[Thorsten Kiefer]

How can I get from a vector index the iterator?

typedef std::vector< doubleT> doubleV;

doubleV xV;
doubleV yV;

// fill xV and yV with values (they have the same size)
...


for( SizeT i=0; i<yV->size(); ++i)
{
if( (*yV)[ i] <= 0.0)
{
yV->erase( ***what? ***); // want to erase yV yV->erase(yV->begin() + i);
xV->erase( ***what? ***); // want to earse xV xV->erase(xV->begin() + i);
}
}


I know I could iterate through an iterator.
But to much typing for xV then.

Thanks,
Marc

 

[Gernot Frisch]

How can I get from a vector index the iterator?

typedef std::vector< doubleT> doubleV;

doubleV xV;
doubleV yV;

// fill xV and yV with values (they have the same size)
...


for( SizeT i=0; i<yV->size(); ++i)
{
if( (*yV)[ i] <= 0.0)
{
yV->erase( ***what? ***); // want to erase yV
xV->erase( ***what? ***); // want to earse xV

(yV->begin() + i) // gives a forward iterator, increased by 'i'
elements.

See also std::advance

 

[m_schellens]

Thank you all!


I actually meant:

doubleV* xV;
doubleV* yV;


Marc