Sfdwhf

How long after the last departure shall the airport stay open for an emergency return?

What is /etc/mtab in Linux?

Is accepting an invalid credit card number a security issue?

How to open locks without disable device?

std::is_constructible on incomplete types

Can I criticise the more senior developers around me for not writing clean code?

As an international instructor, should I openly talk about my accent?

All ASCII characters with a given bit count

The art of proof summarizing. Are there known rules, or is it a purely common sense matter?

What is the best way to deal with NPC-NPC combat?

What *exactly* is electrical current, voltage, and resistance?

What's the difference between using dependency injection with a container and using a service locator?

Is Diceware more secure than a long passphrase?

Trumpet valves, lengths, and pitch

What do you call the part of a novel that is not dialog?

What is the least dense liquid under normal conditions?

Arriving in Atlanta after US Preclearance in Dublin. Will I go through TSA security in Atlanta to transfer to a connecting flight?

How would I use different systems of magic when they are capable of the same effects?

Does Mathematica have an implementation of the Poisson binomial distribution?

My bank got bought out, am I now going to have to start filing tax returns in a different state?

Would reducing the reference voltage of an ADC have any effect on accuracy?

Why do games have consumables?

What to do with someone that cheated their way through university and a PhD program?

Is a 5 watt UHF/VHF handheld considered QRP?

How to find eigenvalue of a matrix using LAPACK in C?

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

0

0

Would you please upload a video on how to install the LAPACK library on Ubuntu and how to use it in C?

Actually I want to diagonalize a matrix and find out the eigenvalue, so someone suggest me to use LAPACK; but, I do'nt know how to use it .

c

share|improve this question

edited 2 hours ago

Kevin Bowen

14.9k155971

asked 13 hours ago

Subhajit DasSubhajit Das

1

New contributor

Subhajit Das is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

0

0

Would you please upload a video on how to install the LAPACK library on Ubuntu and how to use it in C?

Actually I want to diagonalize a matrix and find out the eigenvalue, so someone suggest me to use LAPACK; but, I do'nt know how to use it .

c

share|improve this question

edited 2 hours ago

Kevin Bowen

14.9k155971

asked 13 hours ago

Subhajit DasSubhajit Das

1

New contributor

Subhajit Das is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

Would you please upload a video on how to install the LAPACK library on Ubuntu and how to use it in C?

Actually I want to diagonalize a matrix and find out the eigenvalue, so someone suggest me to use LAPACK; but, I do'nt know how to use it .

c

share|improve this question

edited 2 hours ago

Kevin Bowen

14.9k155971

asked 13 hours ago

Subhajit DasSubhajit Das

1

New contributor

Subhajit Das is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 2 hours ago

Kevin Bowen

14.9k155971

asked 13 hours ago

Subhajit DasSubhajit Das

1

New contributor

Subhajit Das is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

edited 2 hours ago

Kevin Bowen

14.9k155971

asked 13 hours ago

Subhajit DasSubhajit Das

1

New contributor

Subhajit Das is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 2 hours ago

Kevin Bowen

14.9k155971

edited 2 hours ago

Kevin Bowen

14.9k155971

asked 13 hours ago

Subhajit DasSubhajit Das

1

New contributor

Subhajit Das is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 13 hours ago

Subhajit DasSubhajit Das

1

1 Answer
1

active

oldest

votes

1

1. 
   

   Install it using:

   
   
   

   sudo apt-get install liblapacke-dev

   
   

difference between lapacke and lapack

2. Lookup lapack function name: routines
   

Function used to get eigen-value LAPACKE_dgeev

3. Write your code:

Modify this example from lapacke to fit your needs

    /* Calling DGELS using row-major order */



    #include <stdio.h>

    #include <lapacke.h>



    int main (int argc, const char * argv[])

    {

       double a[5][3] = {1,1,1,2,3,4,3,5,2,4,2,5,5,4,3};

       double b[5][2] = {-10,-3,12,14,14,12,16,16,18,16};

       lapack_int info,m,n,lda,ldb,nrhs;

       int i,j;



       m = 5;

       n = 3;

       nrhs = 2;

       lda = 3;

       ldb = 2;



       info = LAPACKE_dgels(LAPACK_ROW_MAJOR,'N',m,n,nrhs,*a,lda,*b,ldb);



       for(i=0;i<n;i++)

       {

          for(j=0;j<nrhs;j++)

          {

             printf("%lf ",b[i][j]);

          }

          printf("n");

       }

       return(info);

    }

4. 
   

   Compile:

   
   
   

   c main.c -llapacke

   
   

share|improve this answer

edited 55 mins ago

Kevin Bowen

14.9k155971

answered 3 hours ago

I.OmarI.Omar

132

New contributor

I.Omar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

Your Answer

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "89"
};
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
});


}
});

Subhajit Das is a new contributor. Be nice, and check out our Code of Conduct.

draft saved

draft discarded

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

Name

Email

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2faskubuntu.com%2fquestions%2f1137783%2fhow-to-find-eigenvalue-of-a-matrix-using-lapack-in-c%23new-answer', 'question_page');
}
);

Post as a guest

Name

Email

Required, but never shown

1

1. 
   

   Install it using:

   
   
   

   sudo apt-get install liblapacke-dev

   
   

difference between lapacke and lapack

2. Lookup lapack function name: routines
   

Function used to get eigen-value LAPACKE_dgeev

3. Write your code:

Modify this example from lapacke to fit your needs

    /* Calling DGELS using row-major order */



    #include <stdio.h>

    #include <lapacke.h>



    int main (int argc, const char * argv[])

    {

       double a[5][3] = {1,1,1,2,3,4,3,5,2,4,2,5,5,4,3};

       double b[5][2] = {-10,-3,12,14,14,12,16,16,18,16};

       lapack_int info,m,n,lda,ldb,nrhs;

       int i,j;



       m = 5;

       n = 3;

       nrhs = 2;

       lda = 3;

       ldb = 2;



       info = LAPACKE_dgels(LAPACK_ROW_MAJOR,'N',m,n,nrhs,*a,lda,*b,ldb);



       for(i=0;i<n;i++)

       {

          for(j=0;j<nrhs;j++)

          {

             printf("%lf ",b[i][j]);

          }

          printf("n");

       }

       return(info);

    }

4. 
   

   Compile:

   
   
   

   c main.c -llapacke

   
   

share|improve this answer

edited 55 mins ago

Kevin Bowen

14.9k155971

answered 3 hours ago

I.OmarI.Omar

132

New contributor

I.Omar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

1

1. 
   

   Install it using:

   
   
   

   sudo apt-get install liblapacke-dev

   
   

difference between lapacke and lapack

2. Lookup lapack function name: routines
   

Function used to get eigen-value LAPACKE_dgeev

3. Write your code:

Modify this example from lapacke to fit your needs

    /* Calling DGELS using row-major order */



    #include <stdio.h>

    #include <lapacke.h>



    int main (int argc, const char * argv[])

    {

       double a[5][3] = {1,1,1,2,3,4,3,5,2,4,2,5,5,4,3};

       double b[5][2] = {-10,-3,12,14,14,12,16,16,18,16};

       lapack_int info,m,n,lda,ldb,nrhs;

       int i,j;



       m = 5;

       n = 3;

       nrhs = 2;

       lda = 3;

       ldb = 2;



       info = LAPACKE_dgels(LAPACK_ROW_MAJOR,'N',m,n,nrhs,*a,lda,*b,ldb);



       for(i=0;i<n;i++)

       {

          for(j=0;j<nrhs;j++)

          {

             printf("%lf ",b[i][j]);

          }

          printf("n");

       }

       return(info);

    }

4. 
   

   Compile:

   
   
   

   c main.c -llapacke

   
   

share|improve this answer

edited 55 mins ago

Kevin Bowen

14.9k155971

answered 3 hours ago

I.OmarI.Omar

132

New contributor

I.Omar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

1. 
   

   Install it using:

   
   
   

   sudo apt-get install liblapacke-dev

   
   

difference between lapacke and lapack

2. Lookup lapack function name: routines
   

Function used to get eigen-value LAPACKE_dgeev

3. Write your code:

Modify this example from lapacke to fit your needs

    /* Calling DGELS using row-major order */



    #include <stdio.h>

    #include <lapacke.h>



    int main (int argc, const char * argv[])

    {

       double a[5][3] = {1,1,1,2,3,4,3,5,2,4,2,5,5,4,3};

       double b[5][2] = {-10,-3,12,14,14,12,16,16,18,16};

       lapack_int info,m,n,lda,ldb,nrhs;

       int i,j;



       m = 5;

       n = 3;

       nrhs = 2;

       lda = 3;

       ldb = 2;



       info = LAPACKE_dgels(LAPACK_ROW_MAJOR,'N',m,n,nrhs,*a,lda,*b,ldb);



       for(i=0;i<n;i++)

       {

          for(j=0;j<nrhs;j++)

          {

             printf("%lf ",b[i][j]);

          }

          printf("n");

       }

       return(info);

    }

4. 
   

   Compile:

   
   
   

   c main.c -llapacke

   
   

share|improve this answer

edited 55 mins ago

Kevin Bowen

14.9k155971

answered 3 hours ago

I.OmarI.Omar

132

New contributor

I.Omar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

    /* Calling DGELS using row-major order */



    #include <stdio.h>

    #include <lapacke.h>



    int main (int argc, const char * argv[])

    {

       double a[5][3] = {1,1,1,2,3,4,3,5,2,4,2,5,5,4,3};

       double b[5][2] = {-10,-3,12,14,14,12,16,16,18,16};

       lapack_int info,m,n,lda,ldb,nrhs;

       int i,j;



       m = 5;

       n = 3;

       nrhs = 2;

       lda = 3;

       ldb = 2;



       info = LAPACKE_dgels(LAPACK_ROW_MAJOR,'N',m,n,nrhs,*a,lda,*b,ldb);



       for(i=0;i<n;i++)

       {

          for(j=0;j<nrhs;j++)

          {

             printf("%lf ",b[i][j]);

          }

          printf("n");

       }

       return(info);

    }

share|improve this answer

edited 55 mins ago

Kevin Bowen

14.9k155971

answered 3 hours ago

I.OmarI.Omar

132

New contributor

I.Omar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

edited 55 mins ago

Kevin Bowen

14.9k155971

edited 55 mins ago

Kevin Bowen

14.9k155971

answered 3 hours ago

I.OmarI.Omar

132

New contributor

I.Omar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 3 hours ago

I.OmarI.Omar

132