index to iterator

[m_schellens]

How can I get from a vector index the iterator?

typedef std::vector< doubleTdoubleV;

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[i]
xV->erase( ***what? ***); // want to earse xV[i]
}
}
I know I could iterate through an iterator.
But to much typing for xV then.

Thanks,
Marc

[Thomas Tutone]

m_*********@hot mail.com wrote:

How can I get from a vector index the iterator?

typedef std::vector< doubleTdoubleV;

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[i]<=0.0)

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

yV.erase(yV.beg in() + i);

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

[Gernot Frisch]

<m_*********@ho tmail.comschrie b im Newsbeitrag
news:11******** **************@ q16g2000cwq.goo glegroups.com.. .

How can I get from a vector index the iterator?

typedef std::vector< doubleTdoubleV;

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[i]
xV->erase( ***what? ***); // want to earse xV[i]

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

See also std::advance

[Thorsten Kiefer]

m_*********@hot mail.com wrote:

How can I get from a vector index the iterator?

typedef std::vector< doubleTdoubleV;

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[i]

yV->erase(yV->begin() + i);

xV->erase( ***what? ***); // want to earse xV[i]

xV->erase(xV->begin() + i);

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

Thanks,
Marc

[m_schellens]

Thank you all!

Thomas Tutone wrote:

m_*********@hot mail.com wrote:

How can I get from a vector index the iterator?

typedef std::vector< doubleTdoubleV;

doubleV xV;
doubleV yV;

I actually meant:

doubleV* xV;
doubleV* yV;
Marc