Thread: Matlab help

Hey, im new to programing in matlab and am having a really hard time with it so far. Im stuck on this one problem:

Define vector xi=(i-m)/(m+3); i=1,...,(2m-1) using a single loop

could someone help me out here. im not even really sure how to start this.
I know how to do simple loops like
for i=1:1:5
x=x+8
end

but thats as far as my skills go right now.
Any help would be awesome

Originally Posted by george

Hey, im new to programing in matlab and am having a really hard time with it so far. Im stuck on this one problem:

Define vector xi=(i-m)/(m+3); i=1,...,(2m-1) using a single loop

could someone help me out here. im not even really sure how to start this.
I know how to do simple loops like
for i=1:1:5
x=x+8
end

but thats as far as my skills go right now.
Any help would be awesome

i posted this in the programing section too, so feel free to delete that one.

With one loop:

Code:

m=10;
xi=zeros(1,2*m-1);

for idx=1:2*m-1;
  xi(idx)=(idx-m)/(m-3);
end

With zero loops

Code:

m=10;
xi=([1:2*m-1]-m)/(m-3);

RonL

Originally Posted by george

Hey, im new to programing in matlab and am having a really hard time with it so far. Im stuck on this one problem:

Define vector xi=(i-m)/(m+3); i=1,...,(2m-1) using a single loop

could someone help me out here. im not even really sure how to start this.
I know how to do simple loops like
for i=1:1:5
x=x+8
end

but thats as far as my skills go right now.
Any help would be awesome

i posted this in the programing section too, so feel free to delete that one.

I have the following code, which may help you to learn the idea.

Code:

s=100;
k=3;
for n=1:(k+1)
    x(n)=1;
end;
for n=(k+1):(s-1)
    mn=mod(n,12);
    if mn==0
        p=-1;
    elseif mn<=3
        p=0;
    else
        p=245/1000;
    end;
    x(n+1)=x(n)-p*x(n-k);
end;
n=1:s
plot(n,x(n),'-rs','LineWidth',1,'MarkerEdgeColor','b','MarkerSize',2)
%n=1:(s-1)
%plot(x(n),x(n+1),'-rs','LineWidth',1,'MarkerEdgeColor','b','MarkerSize',2)
grid on;

It's better you ask stuff like this to http://www.mathhelpforum.com/math-he...uter-software/

can someone explain to me what "idx" means?
thanks

never mind. "idx" is just a variable i think
but could some one help me understand what the code is doing?

haha.. never mind. i understand it. Im learning, just very slowly.

Originally Posted by george

can someone explain to me what "idx" means?
thanks

never mind. "idx" is just a variable i think
but could some one help me understand what the code is doing?

haha.. never mind. i understand it. Im learning, just very slowly.

idx is the name of the counter that runs from 1 to 2*m-1 1 by 1.

a very helpful website for the questions is MATLAB