Quick question on matlab...

You might try something like this:

a=zeros(maxit,1);

a(1)=aini;

for i=2: 1:maxit

a(i)=value_of_a_for_this_iteration;

end

Does that help at all?

Right, so I have a function (similar to the false position method) with one big while loop and every iteration generates values a and b, which change with every iteration... What I'd like to do is create a vector a=[a0,a1,a2...] where a0,a1 etc are the values of a generated with each iteration and same for b

so it looks something like this...

function [a,b]=PlzDieMatlab(f,aini,bini,maxit,tolerance)
*initial conditions*
a=aini
b=bini
etc
while
blablabla
blablabla (either a new value for a or a new value for b)
end

% now the important bit...
a= ?
b= ?
end

anyone have any idea how i can create a vector stating all the different that have been generated for values of a and b with the iterations?

an example of a correct function tested with values would be ...
a = [2 , 2 , 4 , 4 , 7]
b = [9 , 8, 8 , 7 , 7]

quote from the question .. "This means that the return values a and b are vectors with at most maxit elements,
a(1) sbould be aini, and b(1) should be bini. If the iteration stops after
i<maxit iterations are reached then a and b should contain i elements."

any help appreciated, thanks

what do you want he's answered your question

So, have you solved it?

See kfkle's post or I think you can use

a = [a tempa]
b = [b tempb]

where tempa and tempb are the vector results from each iteration. That'll add them as the ith row I think - you can use

a = [a; tempa]
b = [b; tempb]

to add them as columns. Don't forget to initialise before, something like

a = zeros(1,LENGTH OF a)
b = zeros(1,LENGTH OF b)

hey, thanks for the help but it didn't work, it produced the correct end result but it didn't show what the previous values of a and b correctly.



thanks for response, i'll try this out once I have downloaded matlab on my home computer as i'm away from university now for the easter hols