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

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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
Jan
Jan on 27 Jun 2018
What exactly is the problem? Importing the file, extracting the 2nd column or using gradient twice?
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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Accepted Answer

Jan
Jan on 28 Jun 2018
gradient(gradient(data(:,2)));

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);

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