how to express a set

sir, my problem is i want to write ai belongs to A(1<=i<=N) where A={a1,a2,...aN}in matab.i have written this like:

 for A=1:N;
    if (1<=i<=N)
    ai=A;
    end 
end 
i am new to matlab .plz tell me this is right or wrong and if it's wrong then what to write..
Expecting a favorable reply.
Thanking u SUCHI

[Andy]

It is very unclear what you're trying to do, but it looks like you have a cell array A which is a vector of length n, and you want to have variables a1, a2, ..., an representing each element of your cell array. Is this correct? If so, don't do this. It is much better to keep your data in a cell array A and refer to it as A{i} rather than ai. Perhaps you should refer to http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F.

Answer 1

[Andrei Bobrov]

ai = A(1:N);

[suchismita]

hello mr.andrei.

when i am trying the expression u ve suggest i am getting the error like below.u ve suggest me to write ai = A(1:N); to express a set.

??? Undefined function or method 'A' for input arguments of type 'double'.

Error in ==> maximum_life at 24

ai = A(1:N);

pllzz help.

regards SUCHI

[Andrei Bobrov]

Error in "maximum_life" at line 24,

variable A - undefined.

Her need defined.

[Oleg Komarov]

i.e. you have do define A (and N) before calling ai = A(1:N);

otherwise is the same as saying "tell me the true lottery numbers that are gonna be drawn tomorrow"