print out all combinations of index

Multi tool use
I set a vector list, for example :
vector<VectorXi> Test;
Test.push_back(VectorXi(0,1));
Test.push_back(VectorXi(0,1,2));
Test.push_back(VectorXi(0));
Test.push_back(VectorXi(0,1));
Test.push_back(VectorXi(0,1,2,3));
PrintAllCombins(Test)
And now I want to get all combinations of indexes :
0, 0, 0, 0, 0
0, 0, 0, 0, 1
0, 0, 0, 0, 2
0, 0, 0, 0, 3
0, 0, 0, 1, 0
0, 0, 0, 1, 1
0, 0, 0, 1, 2
0, 0, 0, 1, 3
0, 0, 1, 0, 0
0, 0, 1, 0, 1
0, 0, 1, 0, 2
0, 0, 1, 0, 3
... and so on
If i use for or while loop suitably, then it works I guess, but I encounter limitation. Is there any idea? I'm writing code in c and c++
--------------------- code : this is an example code that im using.
vector<VectorXi> Test;
VectorXi a0(2); a0[0] = 0; a0[1] = 1;
VectorXi a1(3); a1[0] = 0; a1[1] = 1; a1[2] = 2;
VectorXi a2(2); a2[0] = 0; a2[1] = 1;
VectorXi a3(4); a3[0] = 0; a3[1] = 1; a3[2] = 2; a3[3] = 3;
VectorXi a5(1); a5[0] = 0;
Test.push_back(a0);
Test.push_back(a1);
Test.push_back(a5);
Test.push_back(a2);
Test.push_back(a3);
VectorXi index(5);
for (int i = 0; i < 5; i++)
index[i] = 0;
int IndexTemp = Test.size()-1;
vector<VectorXi> result;
bool c = true;
while (c == true)
{
if (index[IndexTemp] < Test[IndexTemp].size()-1)
{
VectorXi T;
T.resize(Test.size());
for (int j = 0; j<Test.size(); j++)
{
T[j] = Test[j](index[j]);
}
result.push_back(T);
index[IndexTemp] ++;
}
else if (index[IndexTemp] == Test[IndexTemp].size()-1)
{
VectorXi T;
T.resize(Test.size());
for (int j = 0; j<Test.size(); j++)
{
T[j] = Test[j](index[j]);
}
result.push_back(T);
IndexTemp--;
if (IndexTemp < 0)
break;
index[IndexTemp] ++;
}
}
for (unsigned int i = 0; i < result.size(); i++)
{
cout << i << " : ";
for (unsigned int j = 0; j < result[i].size(); j++)
{
cout << result[i](j) << " ";
}
cout << endl;
}
It does not show all combinations now..
If I make code to work only to this example (Test.size() == 5)
I just use for loop five times like :
for(Test[0].size())
for(Test[1].size())
for(Test[2].size())
for(Test[3].size())
for(Test[4].size())
cout << ~~~~~
Then it gives all combinations.
However if the Test.size() increased, I cannot write all for loops manually.
c++ cartesian-product
add a comment |
I set a vector list, for example :
vector<VectorXi> Test;
Test.push_back(VectorXi(0,1));
Test.push_back(VectorXi(0,1,2));
Test.push_back(VectorXi(0));
Test.push_back(VectorXi(0,1));
Test.push_back(VectorXi(0,1,2,3));
PrintAllCombins(Test)
And now I want to get all combinations of indexes :
0, 0, 0, 0, 0
0, 0, 0, 0, 1
0, 0, 0, 0, 2
0, 0, 0, 0, 3
0, 0, 0, 1, 0
0, 0, 0, 1, 1
0, 0, 0, 1, 2
0, 0, 0, 1, 3
0, 0, 1, 0, 0
0, 0, 1, 0, 1
0, 0, 1, 0, 2
0, 0, 1, 0, 3
... and so on
If i use for or while loop suitably, then it works I guess, but I encounter limitation. Is there any idea? I'm writing code in c and c++
--------------------- code : this is an example code that im using.
vector<VectorXi> Test;
VectorXi a0(2); a0[0] = 0; a0[1] = 1;
VectorXi a1(3); a1[0] = 0; a1[1] = 1; a1[2] = 2;
VectorXi a2(2); a2[0] = 0; a2[1] = 1;
VectorXi a3(4); a3[0] = 0; a3[1] = 1; a3[2] = 2; a3[3] = 3;
VectorXi a5(1); a5[0] = 0;
Test.push_back(a0);
Test.push_back(a1);
Test.push_back(a5);
Test.push_back(a2);
Test.push_back(a3);
VectorXi index(5);
for (int i = 0; i < 5; i++)
index[i] = 0;
int IndexTemp = Test.size()-1;
vector<VectorXi> result;
bool c = true;
while (c == true)
{
if (index[IndexTemp] < Test[IndexTemp].size()-1)
{
VectorXi T;
T.resize(Test.size());
for (int j = 0; j<Test.size(); j++)
{
T[j] = Test[j](index[j]);
}
result.push_back(T);
index[IndexTemp] ++;
}
else if (index[IndexTemp] == Test[IndexTemp].size()-1)
{
VectorXi T;
T.resize(Test.size());
for (int j = 0; j<Test.size(); j++)
{
T[j] = Test[j](index[j]);
}
result.push_back(T);
IndexTemp--;
if (IndexTemp < 0)
break;
index[IndexTemp] ++;
}
}
for (unsigned int i = 0; i < result.size(); i++)
{
cout << i << " : ";
for (unsigned int j = 0; j < result[i].size(); j++)
{
cout << result[i](j) << " ";
}
cout << endl;
}
It does not show all combinations now..
If I make code to work only to this example (Test.size() == 5)
I just use for loop five times like :
for(Test[0].size())
for(Test[1].size())
for(Test[2].size())
for(Test[3].size())
for(Test[4].size())
cout << ~~~~~
Then it gives all combinations.
However if the Test.size() increased, I cannot write all for loops manually.
c++ cartesian-product
What have you tried doing? show the code. Also explain what limitations you encountered
– UnholySheep
Mar 30 '17 at 7:48
What is VectorXi?
– Shridhar R Kulkarni
Mar 30 '17 at 7:52
Similar to how-to-get-cartesian-product-from-different-group-member and algorithm-to-get-cartesian-product
– Jarod42
Mar 30 '17 at 8:02
Thanks! it is the solution I am looking for!
– Wooni
Mar 30 '17 at 8:06
add a comment |
I set a vector list, for example :
vector<VectorXi> Test;
Test.push_back(VectorXi(0,1));
Test.push_back(VectorXi(0,1,2));
Test.push_back(VectorXi(0));
Test.push_back(VectorXi(0,1));
Test.push_back(VectorXi(0,1,2,3));
PrintAllCombins(Test)
And now I want to get all combinations of indexes :
0, 0, 0, 0, 0
0, 0, 0, 0, 1
0, 0, 0, 0, 2
0, 0, 0, 0, 3
0, 0, 0, 1, 0
0, 0, 0, 1, 1
0, 0, 0, 1, 2
0, 0, 0, 1, 3
0, 0, 1, 0, 0
0, 0, 1, 0, 1
0, 0, 1, 0, 2
0, 0, 1, 0, 3
... and so on
If i use for or while loop suitably, then it works I guess, but I encounter limitation. Is there any idea? I'm writing code in c and c++
--------------------- code : this is an example code that im using.
vector<VectorXi> Test;
VectorXi a0(2); a0[0] = 0; a0[1] = 1;
VectorXi a1(3); a1[0] = 0; a1[1] = 1; a1[2] = 2;
VectorXi a2(2); a2[0] = 0; a2[1] = 1;
VectorXi a3(4); a3[0] = 0; a3[1] = 1; a3[2] = 2; a3[3] = 3;
VectorXi a5(1); a5[0] = 0;
Test.push_back(a0);
Test.push_back(a1);
Test.push_back(a5);
Test.push_back(a2);
Test.push_back(a3);
VectorXi index(5);
for (int i = 0; i < 5; i++)
index[i] = 0;
int IndexTemp = Test.size()-1;
vector<VectorXi> result;
bool c = true;
while (c == true)
{
if (index[IndexTemp] < Test[IndexTemp].size()-1)
{
VectorXi T;
T.resize(Test.size());
for (int j = 0; j<Test.size(); j++)
{
T[j] = Test[j](index[j]);
}
result.push_back(T);
index[IndexTemp] ++;
}
else if (index[IndexTemp] == Test[IndexTemp].size()-1)
{
VectorXi T;
T.resize(Test.size());
for (int j = 0; j<Test.size(); j++)
{
T[j] = Test[j](index[j]);
}
result.push_back(T);
IndexTemp--;
if (IndexTemp < 0)
break;
index[IndexTemp] ++;
}
}
for (unsigned int i = 0; i < result.size(); i++)
{
cout << i << " : ";
for (unsigned int j = 0; j < result[i].size(); j++)
{
cout << result[i](j) << " ";
}
cout << endl;
}
It does not show all combinations now..
If I make code to work only to this example (Test.size() == 5)
I just use for loop five times like :
for(Test[0].size())
for(Test[1].size())
for(Test[2].size())
for(Test[3].size())
for(Test[4].size())
cout << ~~~~~
Then it gives all combinations.
However if the Test.size() increased, I cannot write all for loops manually.
c++ cartesian-product
I set a vector list, for example :
vector<VectorXi> Test;
Test.push_back(VectorXi(0,1));
Test.push_back(VectorXi(0,1,2));
Test.push_back(VectorXi(0));
Test.push_back(VectorXi(0,1));
Test.push_back(VectorXi(0,1,2,3));
PrintAllCombins(Test)
And now I want to get all combinations of indexes :
0, 0, 0, 0, 0
0, 0, 0, 0, 1
0, 0, 0, 0, 2
0, 0, 0, 0, 3
0, 0, 0, 1, 0
0, 0, 0, 1, 1
0, 0, 0, 1, 2
0, 0, 0, 1, 3
0, 0, 1, 0, 0
0, 0, 1, 0, 1
0, 0, 1, 0, 2
0, 0, 1, 0, 3
... and so on
If i use for or while loop suitably, then it works I guess, but I encounter limitation. Is there any idea? I'm writing code in c and c++
--------------------- code : this is an example code that im using.
vector<VectorXi> Test;
VectorXi a0(2); a0[0] = 0; a0[1] = 1;
VectorXi a1(3); a1[0] = 0; a1[1] = 1; a1[2] = 2;
VectorXi a2(2); a2[0] = 0; a2[1] = 1;
VectorXi a3(4); a3[0] = 0; a3[1] = 1; a3[2] = 2; a3[3] = 3;
VectorXi a5(1); a5[0] = 0;
Test.push_back(a0);
Test.push_back(a1);
Test.push_back(a5);
Test.push_back(a2);
Test.push_back(a3);
VectorXi index(5);
for (int i = 0; i < 5; i++)
index[i] = 0;
int IndexTemp = Test.size()-1;
vector<VectorXi> result;
bool c = true;
while (c == true)
{
if (index[IndexTemp] < Test[IndexTemp].size()-1)
{
VectorXi T;
T.resize(Test.size());
for (int j = 0; j<Test.size(); j++)
{
T[j] = Test[j](index[j]);
}
result.push_back(T);
index[IndexTemp] ++;
}
else if (index[IndexTemp] == Test[IndexTemp].size()-1)
{
VectorXi T;
T.resize(Test.size());
for (int j = 0; j<Test.size(); j++)
{
T[j] = Test[j](index[j]);
}
result.push_back(T);
IndexTemp--;
if (IndexTemp < 0)
break;
index[IndexTemp] ++;
}
}
for (unsigned int i = 0; i < result.size(); i++)
{
cout << i << " : ";
for (unsigned int j = 0; j < result[i].size(); j++)
{
cout << result[i](j) << " ";
}
cout << endl;
}
It does not show all combinations now..
If I make code to work only to this example (Test.size() == 5)
I just use for loop five times like :
for(Test[0].size())
for(Test[1].size())
for(Test[2].size())
for(Test[3].size())
for(Test[4].size())
cout << ~~~~~
Then it gives all combinations.
However if the Test.size() increased, I cannot write all for loops manually.
c++ cartesian-product
c++ cartesian-product
edited Mar 30 '17 at 8:02
Jarod42
114k12101182
114k12101182
asked Mar 30 '17 at 7:46
WooniWooni
93110
93110
What have you tried doing? show the code. Also explain what limitations you encountered
– UnholySheep
Mar 30 '17 at 7:48
What is VectorXi?
– Shridhar R Kulkarni
Mar 30 '17 at 7:52
Similar to how-to-get-cartesian-product-from-different-group-member and algorithm-to-get-cartesian-product
– Jarod42
Mar 30 '17 at 8:02
Thanks! it is the solution I am looking for!
– Wooni
Mar 30 '17 at 8:06
add a comment |
What have you tried doing? show the code. Also explain what limitations you encountered
– UnholySheep
Mar 30 '17 at 7:48
What is VectorXi?
– Shridhar R Kulkarni
Mar 30 '17 at 7:52
Similar to how-to-get-cartesian-product-from-different-group-member and algorithm-to-get-cartesian-product
– Jarod42
Mar 30 '17 at 8:02
Thanks! it is the solution I am looking for!
– Wooni
Mar 30 '17 at 8:06
What have you tried doing? show the code. Also explain what limitations you encountered
– UnholySheep
Mar 30 '17 at 7:48
What have you tried doing? show the code. Also explain what limitations you encountered
– UnholySheep
Mar 30 '17 at 7:48
What is VectorXi?
– Shridhar R Kulkarni
Mar 30 '17 at 7:52
What is VectorXi?
– Shridhar R Kulkarni
Mar 30 '17 at 7:52
Similar to how-to-get-cartesian-product-from-different-group-member and algorithm-to-get-cartesian-product
– Jarod42
Mar 30 '17 at 8:02
Similar to how-to-get-cartesian-product-from-different-group-member and algorithm-to-get-cartesian-product
– Jarod42
Mar 30 '17 at 8:02
Thanks! it is the solution I am looking for!
– Wooni
Mar 30 '17 at 8:06
Thanks! it is the solution I am looking for!
– Wooni
Mar 30 '17 at 8:06
add a comment |
1 Answer
1
active
oldest
votes
You may do:
bool increase(const std::vector<std::vector<int>>& v, std::vector<std::size_t>& it)
{
for (std::size_t i = 0, size = it.size(); i != size; ++i) {
const std::size_t index = size - 1 - i;
++it[index];
if (it[index] >= v[index].size()) {
it[index] = 0;
} else {
return true;
}
}
return false;
}
void do_job(const std::vector<std::vector<int>>& v,
const std::vector<std::size_t>& it)
{
for (std::size_t i = 0; i != it.size(); ++i) {
// TODO: manage case where v[i] is empty if relevant.
std::cout << v[i][it[i]] << " ";
}
std::cout << std::endl;
}
void iterate(const std::vector<std::vector<int>>& v)
{
std::vector<std::size_t> it(v.size(), 0u);
do {
do_job(v, it);
} while (increase(v, it));
}
Live Demo
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f43111572%2fprint-out-all-combinations-of-index%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You may do:
bool increase(const std::vector<std::vector<int>>& v, std::vector<std::size_t>& it)
{
for (std::size_t i = 0, size = it.size(); i != size; ++i) {
const std::size_t index = size - 1 - i;
++it[index];
if (it[index] >= v[index].size()) {
it[index] = 0;
} else {
return true;
}
}
return false;
}
void do_job(const std::vector<std::vector<int>>& v,
const std::vector<std::size_t>& it)
{
for (std::size_t i = 0; i != it.size(); ++i) {
// TODO: manage case where v[i] is empty if relevant.
std::cout << v[i][it[i]] << " ";
}
std::cout << std::endl;
}
void iterate(const std::vector<std::vector<int>>& v)
{
std::vector<std::size_t> it(v.size(), 0u);
do {
do_job(v, it);
} while (increase(v, it));
}
Live Demo
add a comment |
You may do:
bool increase(const std::vector<std::vector<int>>& v, std::vector<std::size_t>& it)
{
for (std::size_t i = 0, size = it.size(); i != size; ++i) {
const std::size_t index = size - 1 - i;
++it[index];
if (it[index] >= v[index].size()) {
it[index] = 0;
} else {
return true;
}
}
return false;
}
void do_job(const std::vector<std::vector<int>>& v,
const std::vector<std::size_t>& it)
{
for (std::size_t i = 0; i != it.size(); ++i) {
// TODO: manage case where v[i] is empty if relevant.
std::cout << v[i][it[i]] << " ";
}
std::cout << std::endl;
}
void iterate(const std::vector<std::vector<int>>& v)
{
std::vector<std::size_t> it(v.size(), 0u);
do {
do_job(v, it);
} while (increase(v, it));
}
Live Demo
add a comment |
You may do:
bool increase(const std::vector<std::vector<int>>& v, std::vector<std::size_t>& it)
{
for (std::size_t i = 0, size = it.size(); i != size; ++i) {
const std::size_t index = size - 1 - i;
++it[index];
if (it[index] >= v[index].size()) {
it[index] = 0;
} else {
return true;
}
}
return false;
}
void do_job(const std::vector<std::vector<int>>& v,
const std::vector<std::size_t>& it)
{
for (std::size_t i = 0; i != it.size(); ++i) {
// TODO: manage case where v[i] is empty if relevant.
std::cout << v[i][it[i]] << " ";
}
std::cout << std::endl;
}
void iterate(const std::vector<std::vector<int>>& v)
{
std::vector<std::size_t> it(v.size(), 0u);
do {
do_job(v, it);
} while (increase(v, it));
}
Live Demo
You may do:
bool increase(const std::vector<std::vector<int>>& v, std::vector<std::size_t>& it)
{
for (std::size_t i = 0, size = it.size(); i != size; ++i) {
const std::size_t index = size - 1 - i;
++it[index];
if (it[index] >= v[index].size()) {
it[index] = 0;
} else {
return true;
}
}
return false;
}
void do_job(const std::vector<std::vector<int>>& v,
const std::vector<std::size_t>& it)
{
for (std::size_t i = 0; i != it.size(); ++i) {
// TODO: manage case where v[i] is empty if relevant.
std::cout << v[i][it[i]] << " ";
}
std::cout << std::endl;
}
void iterate(const std::vector<std::vector<int>>& v)
{
std::vector<std::size_t> it(v.size(), 0u);
do {
do_job(v, it);
} while (increase(v, it));
}
Live Demo
answered Mar 30 '17 at 8:07
Jarod42Jarod42
114k12101182
114k12101182
add a comment |
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f43111572%2fprint-out-all-combinations-of-index%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
bdy5vrWxnEHY7smGNslQzdC5m69,IaMLHUeH D0TCuHHc2r5Ef
What have you tried doing? show the code. Also explain what limitations you encountered
– UnholySheep
Mar 30 '17 at 7:48
What is VectorXi?
– Shridhar R Kulkarni
Mar 30 '17 at 7:52
Similar to how-to-get-cartesian-product-from-different-group-member and algorithm-to-get-cartesian-product
– Jarod42
Mar 30 '17 at 8:02
Thanks! it is the solution I am looking for!
– Wooni
Mar 30 '17 at 8:06