Passing an array from txt file to a function
-2
I have a simple function of the form:
double f(double x)
{
...
}
For that function, I want to use data from a txt file, which I pass to an array:
ifstream inFile;
inFile.open("data.txt");
//Counting lines
string s;
int nlines=0;
while(!inFile.eof()){
getline(inFile, s);
nlines++;
}
inFile.seekg(0, ios::beg);
while(!inFile.eof()){
inFile >> a[entry_data];
inFile >> b[entry_data++];
}
inFile.close();
If I put this code inside the function f, each time the function is called, it will have to open the file, create the array... and so on. I want to avoid this by defining the array just the first time the function is called, or before. How can I do this?
I know that if I define the array in the main scope and pass it to the function as an argument I can solve this, but I want to keep the main scope as clean as possible. Thanks!
c++ arrays function
asked Nov 21 '18 at 18:03
PsyphyPsyphy
33
add a comment |
-2
I have a simple function of the form:
double f(double x)
{
...
}
For that function, I want to use data from a txt file, which I pass to an array:
ifstream inFile;
inFile.open("data.txt");
//Counting lines
string s;
int nlines=0;
while(!inFile.eof()){
getline(inFile, s);
nlines++;
}
inFile.seekg(0, ios::beg);
while(!inFile.eof()){
inFile >> a[entry_data];
inFile >> b[entry_data++];
}
inFile.close();
If I put this code inside the function f, each time the function is called, it will have to open the file, create the array... and so on. I want to avoid this by defining the array just the first time the function is called, or before. How can I do this?
I know that if I define the array in the main scope and pass it to the function as an argument I can solve this, but I want to keep the main scope as clean as possible. Thanks!
c++ arrays function
asked Nov 21 '18 at 18:03
PsyphyPsyphy
33
Wrap your function in a class, and use a singleton there to get the data you want.
– Matthieu Brucher
Nov 21 '18 at 18:05
4
OT but a bug:while(!inFile.eof()){stackoverflow.com/questions/5605125/…
– drescherjm
Nov 21 '18 at 18:07
1
Why are you counting the lines?! Total waste of electrons.
– n.m.
Nov 21 '18 at 18:15
My guess is the OP can't use std::vector. That is not at all clear since the line count is not used and we don't know whereaandbare declared or allocated.
– drescherjm
Nov 21 '18 at 18:16
1
@drescherjm cannot use vector but can use seekg? Found an idiot professor.
– n.m.
Nov 21 '18 at 18:17
add a comment |
-2
-2
-2
I have a simple function of the form:
double f(double x)
{
...
}
For that function, I want to use data from a txt file, which I pass to an array:
ifstream inFile;
inFile.open("data.txt");
//Counting lines
string s;
int nlines=0;
while(!inFile.eof()){
getline(inFile, s);
nlines++;
}
inFile.seekg(0, ios::beg);
while(!inFile.eof()){
inFile >> a[entry_data];
inFile >> b[entry_data++];
}
inFile.close();
If I put this code inside the function f, each time the function is called, it will have to open the file, create the array... and so on. I want to avoid this by defining the array just the first time the function is called, or before. How can I do this?
I know that if I define the array in the main scope and pass it to the function as an argument I can solve this, but I want to keep the main scope as clean as possible. Thanks!
c++ arrays function
asked Nov 21 '18 at 18:03
PsyphyPsyphy
33
I have a simple function of the form:
double f(double x)
{
...
}
For that function, I want to use data from a txt file, which I pass to an array:
ifstream inFile;
inFile.open("data.txt");
//Counting lines
string s;
int nlines=0;
while(!inFile.eof()){
getline(inFile, s);
nlines++;
}
inFile.seekg(0, ios::beg);
while(!inFile.eof()){
inFile >> a[entry_data];
inFile >> b[entry_data++];
}
inFile.close();
If I put this code inside the function f, each time the function is called, it will have to open the file, create the array... and so on. I want to avoid this by defining the array just the first time the function is called, or before. How can I do this?
I know that if I define the array in the main scope and pass it to the function as an argument I can solve this, but I want to keep the main scope as clean as possible. Thanks!
c++ arrays function
c++ arrays function
asked Nov 21 '18 at 18:03
PsyphyPsyphy
33
asked Nov 21 '18 at 18:03
PsyphyPsyphy
33
asked Nov 21 '18 at 18:03
PsyphyPsyphy
33
asked Nov 21 '18 at 18:03
PsyphyPsyphy
33
asked Nov 21 '18 at 18:03
PsyphyPsyphy
33
33
Wrap your function in a class, and use a singleton there to get the data you want.
– Matthieu Brucher
Nov 21 '18 at 18:05
4
OT but a bug:while(!inFile.eof()){stackoverflow.com/questions/5605125/…
– drescherjm
Nov 21 '18 at 18:07
1
Why are you counting the lines?! Total waste of electrons.
– n.m.
Nov 21 '18 at 18:15
My guess is the OP can't use std::vector. That is not at all clear since the line count is not used and we don't know whereaandbare declared or allocated.
– drescherjm
Nov 21 '18 at 18:16
1
@drescherjm cannot use vector but can use seekg? Found an idiot professor.
– n.m.
Nov 21 '18 at 18:17
add a comment |
Wrap your function in a class, and use a singleton there to get the data you want.
– Matthieu Brucher
Nov 21 '18 at 18:05
4
OT but a bug:while(!inFile.eof()){stackoverflow.com/questions/5605125/…
– drescherjm
Nov 21 '18 at 18:07
1
Why are you counting the lines?! Total waste of electrons.
– n.m.
Nov 21 '18 at 18:15
My guess is the OP can't use std::vector. That is not at all clear since the line count is not used and we don't know whereaandbare declared or allocated.
– drescherjm
Nov 21 '18 at 18:16
1
@drescherjm cannot use vector but can use seekg? Found an idiot professor.
– n.m.
Nov 21 '18 at 18:17
Wrap your function in a class, and use a singleton there to get the data you want.
– Matthieu Brucher
Nov 21 '18 at 18:05
Wrap your function in a class, and use a singleton there to get the data you want.
– Matthieu Brucher
Nov 21 '18 at 18:05
4
4
OT but a bug:
while(!inFile.eof()){ stackoverflow.com/questions/5605125/…– drescherjm
Nov 21 '18 at 18:07
OT but a bug:
while(!inFile.eof()){ stackoverflow.com/questions/5605125/…– drescherjm
Nov 21 '18 at 18:07
1
1
Why are you counting the lines?! Total waste of electrons.
– n.m.
Nov 21 '18 at 18:15
Why are you counting the lines?! Total waste of electrons.
– n.m.
Nov 21 '18 at 18:15
My guess is the OP can't use std::vector. That is not at all clear since the line count is not used and we don't know where
a and b are declared or allocated.– drescherjm
Nov 21 '18 at 18:16
My guess is the OP can't use std::vector. That is not at all clear since the line count is not used and we don't know where
a and b are declared or allocated.– drescherjm
Nov 21 '18 at 18:16
1
1
@drescherjm cannot use vector but can use seekg? Found an idiot professor.
– n.m.
Nov 21 '18 at 18:17
@drescherjm cannot use vector but can use seekg? Found an idiot professor.
– n.m.
Nov 21 '18 at 18:17
add a comment |
2 Answers
2
active
oldest
votes
0
Let's create an instance that will read your data.
class DataHolder
{
DataHolder()
{
ifstream inFile;
inFile.open("data.txt");
double v1, v2;
while(inFile >> v1 >> v2){
a.push_back(v1);
b.push_back(v2);
}
}
public:
static DataHolder& getInstance()
{
static DataHolder d;
return d;
}
std::vector<double> a, b;
};
Then in your function, use the data holder:
double f(double x)
{
auto& d = DataHolder::getInstance();
// use the holders data
}
answered Nov 21 '18 at 18:11
Matthieu BrucherMatthieu Brucher
13.4k32140
This is what I need. Thank you!
– Psyphy
Nov 21 '18 at 21:15
I have been testing your idea, but I can't get it to work. I have tried different variations based on the same idea, but using literally what you have posted I geterror: 'DataHolder' does not refer to a value auto& d = DataHolder.getInstance();
– Psyphy
Dec 3 '18 at 21:35
Oops, sorry, it's ::
– Matthieu Brucher
Dec 3 '18 at 22:04
add a comment |
0
Your f function takes 1 (one) value, not an array.
You want to use std::vector<double> instead of array, if you want to pass the data.
Your loop should be:
double value1, value2;
std::vector<double> a;
std::vector<double> b;
while (inFile >> value1 >> value2)
{
a.push_back(value1);
b.push_back(value2);
}
You can use your f function:
const size_t size = a.size();
for (size_t index = 0; index < size; ++size)
{
double result = f(a[index]);
//...
}
Edit 1: Function to Load
You could create an input function and call it once in main:
void input_data(std::istream& input, std::vector<double>& a, std::vector<double>& b)
{
double value1, value2;
while (input >> value1 >> value2)
{
a.push_back(value1);
b.push_back(value2);
}
}
answered Nov 21 '18 at 18:10
Thomas MatthewsThomas Matthews
44.2k1173122
I don't think that's what OP wants.aandbare read insidef, not outside.
– Matthieu Brucher
Nov 21 '18 at 18:13
To me it's not 100% clear what the OP wants.
– drescherjm
Nov 21 '18 at 18:14
Basically the function uses a bunch of parameters that are in a file, and OP doesn't want to load them each time the function is called.
– Matthieu Brucher
Nov 21 '18 at 18:15
1
This gives the OP some tools to work with. I don't like giving 100% solutions, I like to make the posters think.
– Thomas Matthews
Nov 21 '18 at 18:16
1
Also, there is a design smell that the OP should be using aclassthat models the record, instead of using parallel containers.
– Thomas Matthews
Nov 21 '18 at 18:19
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
0
Let's create an instance that will read your data.
class DataHolder
{
DataHolder()
{
ifstream inFile;
inFile.open("data.txt");
double v1, v2;
while(inFile >> v1 >> v2){
a.push_back(v1);
b.push_back(v2);
}
}
public:
static DataHolder& getInstance()
{
static DataHolder d;
return d;
}
std::vector<double> a, b;
};
Then in your function, use the data holder:
double f(double x)
{
auto& d = DataHolder::getInstance();
// use the holders data
}
answered Nov 21 '18 at 18:11
Matthieu BrucherMatthieu Brucher
13.4k32140
This is what I need. Thank you!
– Psyphy
Nov 21 '18 at 21:15
I have been testing your idea, but I can't get it to work. I have tried different variations based on the same idea, but using literally what you have posted I geterror: 'DataHolder' does not refer to a value auto& d = DataHolder.getInstance();
– Psyphy
Dec 3 '18 at 21:35
Oops, sorry, it's ::
– Matthieu Brucher
Dec 3 '18 at 22:04
add a comment |
0
Let's create an instance that will read your data.
class DataHolder
{
DataHolder()
{
ifstream inFile;
inFile.open("data.txt");
double v1, v2;
while(inFile >> v1 >> v2){
a.push_back(v1);
b.push_back(v2);
}
}
public:
static DataHolder& getInstance()
{
static DataHolder d;
return d;
}
std::vector<double> a, b;
};
Then in your function, use the data holder:
double f(double x)
{
auto& d = DataHolder::getInstance();
// use the holders data
}
answered Nov 21 '18 at 18:11
Matthieu BrucherMatthieu Brucher
13.4k32140
This is what I need. Thank you!
– Psyphy
Nov 21 '18 at 21:15
I have been testing your idea, but I can't get it to work. I have tried different variations based on the same idea, but using literally what you have posted I geterror: 'DataHolder' does not refer to a value auto& d = DataHolder.getInstance();
– Psyphy
Dec 3 '18 at 21:35
Oops, sorry, it's ::
– Matthieu Brucher
Dec 3 '18 at 22:04
add a comment |
0
0
0
Let's create an instance that will read your data.
class DataHolder
{
DataHolder()
{
ifstream inFile;
inFile.open("data.txt");
double v1, v2;
while(inFile >> v1 >> v2){
a.push_back(v1);
b.push_back(v2);
}
}
public:
static DataHolder& getInstance()
{
static DataHolder d;
return d;
}
std::vector<double> a, b;
};
Then in your function, use the data holder:
double f(double x)
{
auto& d = DataHolder::getInstance();
// use the holders data
}
answered Nov 21 '18 at 18:11
Matthieu BrucherMatthieu Brucher
13.4k32140
Let's create an instance that will read your data.
class DataHolder
{
DataHolder()
{
ifstream inFile;
inFile.open("data.txt");
double v1, v2;
while(inFile >> v1 >> v2){
a.push_back(v1);
b.push_back(v2);
}
}
public:
static DataHolder& getInstance()
{
static DataHolder d;
return d;
}
std::vector<double> a, b;
};
Then in your function, use the data holder:
double f(double x)
{
auto& d = DataHolder::getInstance();
// use the holders data
}
answered Nov 21 '18 at 18:11
Matthieu BrucherMatthieu Brucher
13.4k32140
edited Dec 3 '18 at 22:04
answered Nov 21 '18 at 18:11
Matthieu BrucherMatthieu Brucher
13.4k32140
answered Nov 21 '18 at 18:11
Matthieu BrucherMatthieu Brucher
13.4k32140
answered Nov 21 '18 at 18:11
Matthieu BrucherMatthieu Brucher
13.4k32140
13.4k32140
This is what I need. Thank you!
– Psyphy
Nov 21 '18 at 21:15
I have been testing your idea, but I can't get it to work. I have tried different variations based on the same idea, but using literally what you have posted I geterror: 'DataHolder' does not refer to a value auto& d = DataHolder.getInstance();
– Psyphy
Dec 3 '18 at 21:35
Oops, sorry, it's ::
– Matthieu Brucher
Dec 3 '18 at 22:04
add a comment |
This is what I need. Thank you!
– Psyphy
Nov 21 '18 at 21:15
I have been testing your idea, but I can't get it to work. I have tried different variations based on the same idea, but using literally what you have posted I geterror: 'DataHolder' does not refer to a value auto& d = DataHolder.getInstance();
– Psyphy
Dec 3 '18 at 21:35
Oops, sorry, it's ::
– Matthieu Brucher
Dec 3 '18 at 22:04
This is what I need. Thank you!
– Psyphy
Nov 21 '18 at 21:15
This is what I need. Thank you!
– Psyphy
Nov 21 '18 at 21:15
I have been testing your idea, but I can't get it to work. I have tried different variations based on the same idea, but using literally what you have posted I get
error: 'DataHolder' does not refer to a value auto& d = DataHolder.getInstance();– Psyphy
Dec 3 '18 at 21:35
I have been testing your idea, but I can't get it to work. I have tried different variations based on the same idea, but using literally what you have posted I get
error: 'DataHolder' does not refer to a value auto& d = DataHolder.getInstance();– Psyphy
Dec 3 '18 at 21:35
Oops, sorry, it's ::
– Matthieu Brucher
Dec 3 '18 at 22:04
Oops, sorry, it's ::
– Matthieu Brucher
Dec 3 '18 at 22:04
add a comment |
0
Your f function takes 1 (one) value, not an array.
You want to use std::vector<double> instead of array, if you want to pass the data.
Your loop should be:
double value1, value2;
std::vector<double> a;
std::vector<double> b;
while (inFile >> value1 >> value2)
{
a.push_back(value1);
b.push_back(value2);
}
You can use your f function:
const size_t size = a.size();
for (size_t index = 0; index < size; ++size)
{
double result = f(a[index]);
//...
}
Edit 1: Function to Load
You could create an input function and call it once in main:
void input_data(std::istream& input, std::vector<double>& a, std::vector<double>& b)
{
double value1, value2;
while (input >> value1 >> value2)
{
a.push_back(value1);
b.push_back(value2);
}
}
answered Nov 21 '18 at 18:10
Thomas MatthewsThomas Matthews
44.2k1173122
I don't think that's what OP wants.aandbare read insidef, not outside.
– Matthieu Brucher
Nov 21 '18 at 18:13
To me it's not 100% clear what the OP wants.
– drescherjm
Nov 21 '18 at 18:14
Basically the function uses a bunch of parameters that are in a file, and OP doesn't want to load them each time the function is called.
– Matthieu Brucher
Nov 21 '18 at 18:15
1
This gives the OP some tools to work with. I don't like giving 100% solutions, I like to make the posters think.
– Thomas Matthews
Nov 21 '18 at 18:16
1
Also, there is a design smell that the OP should be using aclassthat models the record, instead of using parallel containers.
– Thomas Matthews
Nov 21 '18 at 18:19
add a comment |
0
Your f function takes 1 (one) value, not an array.
You want to use std::vector<double> instead of array, if you want to pass the data.
Your loop should be:
double value1, value2;
std::vector<double> a;
std::vector<double> b;
while (inFile >> value1 >> value2)
{
a.push_back(value1);
b.push_back(value2);
}
You can use your f function:
const size_t size = a.size();
for (size_t index = 0; index < size; ++size)
{
double result = f(a[index]);
//...
}
Edit 1: Function to Load
You could create an input function and call it once in main:
void input_data(std::istream& input, std::vector<double>& a, std::vector<double>& b)
{
double value1, value2;
while (input >> value1 >> value2)
{
a.push_back(value1);
b.push_back(value2);
}
}
answered Nov 21 '18 at 18:10
Thomas MatthewsThomas Matthews
44.2k1173122
I don't think that's what OP wants.aandbare read insidef, not outside.
– Matthieu Brucher
Nov 21 '18 at 18:13
To me it's not 100% clear what the OP wants.
– drescherjm
Nov 21 '18 at 18:14
Basically the function uses a bunch of parameters that are in a file, and OP doesn't want to load them each time the function is called.
– Matthieu Brucher
Nov 21 '18 at 18:15
1
This gives the OP some tools to work with. I don't like giving 100% solutions, I like to make the posters think.
– Thomas Matthews
Nov 21 '18 at 18:16
1
Also, there is a design smell that the OP should be using aclassthat models the record, instead of using parallel containers.
– Thomas Matthews
Nov 21 '18 at 18:19
add a comment |
0
0
0
Your f function takes 1 (one) value, not an array.
You want to use std::vector<double> instead of array, if you want to pass the data.
Your loop should be:
double value1, value2;
std::vector<double> a;
std::vector<double> b;
while (inFile >> value1 >> value2)
{
a.push_back(value1);
b.push_back(value2);
}
You can use your f function:
const size_t size = a.size();
for (size_t index = 0; index < size; ++size)
{
double result = f(a[index]);
//...
}
Edit 1: Function to Load
You could create an input function and call it once in main:
void input_data(std::istream& input, std::vector<double>& a, std::vector<double>& b)
{
double value1, value2;
while (input >> value1 >> value2)
{
a.push_back(value1);
b.push_back(value2);
}
}
answered Nov 21 '18 at 18:10
Thomas MatthewsThomas Matthews
44.2k1173122
Your f function takes 1 (one) value, not an array.
You want to use std::vector<double> instead of array, if you want to pass the data.
Your loop should be:
double value1, value2;
std::vector<double> a;
std::vector<double> b;
while (inFile >> value1 >> value2)
{
a.push_back(value1);
b.push_back(value2);
}
You can use your f function:
const size_t size = a.size();
for (size_t index = 0; index < size; ++size)
{
double result = f(a[index]);
//...
}
Edit 1: Function to Load
You could create an input function and call it once in main:
void input_data(std::istream& input, std::vector<double>& a, std::vector<double>& b)
{
double value1, value2;
while (input >> value1 >> value2)
{
a.push_back(value1);
b.push_back(value2);
}
}
answered Nov 21 '18 at 18:10
Thomas MatthewsThomas Matthews
44.2k1173122
edited Nov 21 '18 at 18:13
answered Nov 21 '18 at 18:10
Thomas MatthewsThomas Matthews
44.2k1173122
answered Nov 21 '18 at 18:10
Thomas MatthewsThomas Matthews
44.2k1173122
answered Nov 21 '18 at 18:10
Thomas MatthewsThomas Matthews
44.2k1173122
44.2k1173122
I don't think that's what OP wants.aandbare read insidef, not outside.
– Matthieu Brucher
Nov 21 '18 at 18:13
To me it's not 100% clear what the OP wants.
– drescherjm
Nov 21 '18 at 18:14
Basically the function uses a bunch of parameters that are in a file, and OP doesn't want to load them each time the function is called.
– Matthieu Brucher
Nov 21 '18 at 18:15
1
This gives the OP some tools to work with. I don't like giving 100% solutions, I like to make the posters think.
– Thomas Matthews
Nov 21 '18 at 18:16
1
Also, there is a design smell that the OP should be using aclassthat models the record, instead of using parallel containers.
– Thomas Matthews
Nov 21 '18 at 18:19
add a comment |
I don't think that's what OP wants.aandbare read insidef, not outside.
– Matthieu Brucher
Nov 21 '18 at 18:13
To me it's not 100% clear what the OP wants.
– drescherjm
Nov 21 '18 at 18:14
Basically the function uses a bunch of parameters that are in a file, and OP doesn't want to load them each time the function is called.
– Matthieu Brucher
Nov 21 '18 at 18:15
1
This gives the OP some tools to work with. I don't like giving 100% solutions, I like to make the posters think.
– Thomas Matthews
Nov 21 '18 at 18:16
1
Also, there is a design smell that the OP should be using aclassthat models the record, instead of using parallel containers.
– Thomas Matthews
Nov 21 '18 at 18:19
I don't think that's what OP wants.
a and b are read inside f, not outside.– Matthieu Brucher
Nov 21 '18 at 18:13
I don't think that's what OP wants.
a and b are read inside f, not outside.– Matthieu Brucher
Nov 21 '18 at 18:13
To me it's not 100% clear what the OP wants.
– drescherjm
Nov 21 '18 at 18:14
To me it's not 100% clear what the OP wants.
– drescherjm
Nov 21 '18 at 18:14
Basically the function uses a bunch of parameters that are in a file, and OP doesn't want to load them each time the function is called.
– Matthieu Brucher
Nov 21 '18 at 18:15
Basically the function uses a bunch of parameters that are in a file, and OP doesn't want to load them each time the function is called.
– Matthieu Brucher
Nov 21 '18 at 18:15
1
1
This gives the OP some tools to work with. I don't like giving 100% solutions, I like to make the posters think.
– Thomas Matthews
Nov 21 '18 at 18:16
This gives the OP some tools to work with. I don't like giving 100% solutions, I like to make the posters think.
– Thomas Matthews
Nov 21 '18 at 18:16
1
1
Also, there is a design smell that the OP should be using a
class that models the record, instead of using parallel containers.– Thomas Matthews
Nov 21 '18 at 18:19
Also, there is a design smell that the OP should be using a
class that models the record, instead of using parallel containers.– Thomas Matthews
Nov 21 '18 at 18:19
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Wrap your function in a class, and use a singleton there to get the data you want.
– Matthieu Brucher
Nov 21 '18 at 18:05
4
OT but a bug:
while(!inFile.eof()){stackoverflow.com/questions/5605125/…– drescherjm
Nov 21 '18 at 18:07
1
Why are you counting the lines?! Total waste of electrons.
– n.m.
Nov 21 '18 at 18:15
My guess is the OP can't use std::vector. That is not at all clear since the line count is not used and we don't know where
aandbare declared or allocated.– drescherjm
Nov 21 '18 at 18:16
1
@drescherjm cannot use vector but can use seekg? Found an idiot professor.
– n.m.
Nov 21 '18 at 18:17