problem with vector iterators

[agenevera]

I am trying to insert a vector into a larger vector at various
positions. This, however, will not compile.
vector<double>::iterator pos;
vector<double> tmp;
vector<double> m_parameters;
vector<double> param_start; //vector of start positions in
m_parameters
for (int i=0; i<7; i++)
{
m_parameters.insert(pos[param_start[i]],tmp.begin(),tmp.end());
}
And, then assigning the smaller vectors from the larger one, also
doesn't work.
for (int i=0; i<7; i++)
{
tmp.assign(m_parameters.begin() +
param_start[i],m_parameters.begin()+param_start[i+1]));
}
Am I missing something here? Vector iterators seem to be problematic.
Thanks a bunch!

[Victor Bazarov]

agenevera wrote:

I am trying to insert a vector into a larger vector at various
positions. This, however, will not compile.
vector<double>::iterator pos;
vector<double> tmp;
vector<double> m_parameters;
vector<double> param_start; //vector of start positions in
m_parameters
If it's a vector of positions, shouldn't it be

vector<size_t>
or
vector<int>

at least?
for (int i=0; i<7; i++)
{
m_parameters.insert(pos[param_start[i]],tmp.begin(),tmp.end());
}
And, then assigning the smaller vectors from the larger one, also
doesn't work.
for (int i=0; i<7; i++)
{
tmp.assign(m_parameters.begin() +
param_start[i],m_parameters.begin()+param_start[i+1]));
}
Am I missing something here? Vector iterators seem to be problematic.

I think you've completely missed the point of the iterators. What book on
C++ are you reading that doesn't explain iterators?

V
--
Please remove capital As from my address when replying by mail

[Daniel T.]

In article <11**********************@g47g2000cwa.googlegroups .com>,
"agenevera" <ga****@rice.edu> wrote:

I am trying to insert a vector into a larger vector at various
positions. This, however, will not compile. vector<double>::iterator pos;
vector<double> tmp;
vector<double> m_parameters;
vector<double> param_start; //vector of start positions in
m_parameters
for (int i=0; i<7; i++)
{
m_parameters.insert(pos[param_start[i]],tmp.begin(),tmp.end());
pos[param_start[i]] is not an iterator. Try this instead:

pos = m_parameters.begin() + param_start[i];
m_parameters.insert( pos, tmp.begin(), tmp.end() );

You did it right below...
}
And, then assigning the smaller vectors from the larger one, also
doesn't work.
for (int i=0; i<7; i++)
{
tmp.assign(m_parameters.begin() +
param_start[i],m_parameters.begin()+param_start[i+1]));
The above doesn't work for me because I have an old compiler, you may
have the same problem? I had to do:

pos = m_parameters.begin();
tmp.assign( pos + param_start[i], pos + param_start[i + 1] );
}
Am I missing something here? Vector iterators seem to be problematic.
Thanks a bunch!

--
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nor does it profit by experiment. On the other hand, science is based
on experience; it is open to correction by observation and experiment.