How can I display the second derive of a vector ,?

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Mallouli Marwa
Mallouli Marwa le 27 Juin 2018
Commenté : Mallouli Marwa le 28 Juin 2018
Hello
How can I display the second derive of a vector ?
Mention that I have this table and I want to obtain the second derive of the second column of the table.
Thanks
  2 commentaires
Jan
Jan le 27 Juin 2018
What exactly is the problem? Importing the file, extracting the 2nd column or using gradient twice?
Mallouli Marwa
Mallouli Marwa le 27 Juin 2018
Yes Importing the file, extracting the 2nd column and calculating
gradient twice of this column

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Jan
Jan le 28 Juin 2018
gradient(gradient(data(:,2)));

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Mark Saad
Mark Saad le 27 Juin 2018
Modifié(e) : Mark Saad le 27 Juin 2018
You can first import it into MATLAB as an array using textread.
data = textread('essai_Al_but05_fixe_100Ohm.txt');
Then just access elements using data(i,j) where i is the row and j is the column. So if you want the second element in the third row, you do
data(3,2);
If you want the entire third row, you do
data(3,:);
Or if you want the entire second column,
data(:,2);
  1 commentaire
Mallouli Marwa
Mallouli Marwa le 28 Juin 2018
Then how can I calculate the gradient twice of this column ?

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