Dynamic variable names(ordered with subscript) in a loop creating new dynamic variables

Hello everyone,

I am new here and quite new at programming too. I have been trying to write a code for my final research for 2 days. So couldn't find de right loop and asking for your precious help. I guess it may be quite easy for you though...

the equation is;

"P" s are vectors.

P_1 = [a b c]; P_2 = [d e f]; P_3 = [g h i]; P_4 = [j k l]; P_5 = [m n o];

letters are numbers like (0.5315, 1.0248, ...ets)

P_j = P_(i+1) - P_i and i = 1,..,5 ; j = 1,..,4

I can also name P_j as Pi+1,i (like P_j=1 = P_21 = P_2 - P_1).

Thanks for your answers.

[KSSV]

Dynamic labelling is a bad ides., Instead you define your vectors I to a matrix and access them.

[Jan]

This is not twitter: No # before the tags, please.

Answer 1

[Jan]

Don't do this.

Do not create variables dynamically and do not hide inidces in th names. Use numerical arrays instead:

P = [a b c; ...
     d e f; ...
     g h i; ...
     j k l; ...
     m n o];

Now P(i, :) is what you wanted to call "P_i". It is very easy to expand this until i = 1e6 and calculations with rows of matrices are trivial.

This is a very frequently asked question. Searching in the forum is a good strategy to start with. See e.g.: https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

[Evrim Yilmaz]

Thank you for your advice. Sorry for the # btw, I hate it but felt I had to.