searching for global extrema

[Gary Wessle]

Hi

I have a routine
double myRou ( double x, double y ) { ... };

the way I use it is
vector<doubleres;

for(double i = 1; i < 1000; ++i) {
for( double j = 1; j < 1000; ++j) {
res.push_back( myRou( i, j );
}
}

then I go to find the maximum or minimum values in res.

is there some algorithm that can help me find the global min/max?

thanks

[Michael]

I have a routine

double myRou ( double x, double y ) { ... };

the way I use it is
vector<doubleres;

for(double i = 1; i < 1000; ++i) {
for( double j = 1; j < 1000; ++j) {
res.push_back( myRou( i, j );
}
}

is there some algorithm that can help me find the global min/max?

min_element and max_element in <algorithm>.

E.g.
double theMin = *min_element(res.begin(), res.end());

Michael

[Mark P]

Gary Wessle wrote:

Hi

I have a routine
double myRou ( double x, double y ) { ... };

the way I use it is
vector<doubleres;

for(double i = 1; i < 1000; ++i) {
for( double j = 1; j < 1000; ++j) {
res.push_back( myRou( i, j );
}
}

then I go to find the maximum or minimum values in res.

is there some algorithm that can help me find the global min/max?

thanks

std::min_element
std::max_element

[Gary Wessle]

Mark P <us****@fall2005REMOVE.fastmailCAPS.fmwrites:

Gary Wessle wrote:

Hi
I have a routine double myRou ( double x, double y ) { ... };
the way I use it is
vector<doubleres;
for(double i = 1; i < 1000; ++i) {
for( double j = 1; j < 1000; ++j) { res.push_back( myRou(
i, j );
}
}
then I go to find the maximum or minimum values in res.
is there some algorithm that can help me find the global min/max?
thanks

std::min_element
std::max_element

I feel I was not clear.
I did not mean to find the min and max of the res vector but rather to
find the global extrema with out the loop.

[BobR]

Gary Wessle wrote in message ...

>Mark P <us****@fall2005REMOVE.fastmailCAPS.fmwrites:

>Gary Wessle wrote:

Hi

<snip misleading loops>

is there some algorithm that can help me find the global min/max?
thanks

std::min_element
std::max_element

I feel I was not clear.
I did not mean to find the min and max of the res vector but rather to
find the global extrema with out the loop.

// #include <limits>
std::numeric_limits<double>::max()
std::numeric_limits<double>::min()

--
Bob R
POVrookie

[red floyd]

Gary Wessle wrote:

Mark P <us****@fall2005REMOVE.fastmailCAPS.fmwrites:

>>

I feel I was not clear.
I did not mean to find the min and max of the res vector but rather to
find the global extrema with out the loop.

wrong group. Try comp.programming, and ask for an extrema algorithm.

[Mark P]

Gary Wessle wrote:

Mark P <us****@fall2005REMOVE.fastmailCAPS.fmwrites:

>Gary Wessle wrote:

>>Hi
I have a routine double myRou ( double x, double y ) { ... };
the way I use it is
vector<doubleres;
for(double i = 1; i < 1000; ++i) {
for( double j = 1; j < 1000; ++j) { res.push_back( myRou(
i, j );
}
}
then I go to find the maximum or minimum values in res.
is there some algorithm that can help me find the global min/max?
thanks

std::min_element
std::max_element

I feel I was not clear.
I did not mean to find the min and max of the res vector but rather to
find the global extrema with out the loop.

What do you mean? Do you want to know the maximum and minimum
attainable values of the function myRou over all possible values for x
and y?