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

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Mallouli Marwa
Mallouli Marwa on 27 Jun 2018
Commented: Mallouli Marwa on 28 Jun 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 Comments
Mallouli Marwa
Mallouli Marwa on 27 Jun 2018
Yes Importing the file, extracting the 2nd column and calculating
gradient twice of this column

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More Answers (1)

Mark Saad
Mark Saad on 27 Jun 2018
Edited: Mark Saad on 27 Jun 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 Comment
Mallouli Marwa
Mallouli Marwa on 28 Jun 2018
Then how can I calculate the gradient twice of this column ?

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