How to use previously calculated value in next iteration

I haven't used Matlab in some time - I'm slowly getting back in the groove.

I'm trying to run some raw data through a smoothing filter as shown below. I need each calculation in the for loop to use the previously calculated value (Tf) during the next iteration.

Tf(n)=5 %Initial value for Tf
for n=1:700000
   Tf(n)=(1/32)*L(n)+(1-(1/32))*Tf(n);  %filter
end

I also tried this:

Tfn(n)=5
for n=1:700000
   Tf(n)=(1/32)*L(n)+(1-(1/32))*Tfn(n);  %filter
   Tfn(n)=Tf(n)
end

What am I doing wrong?

Thanks

EDIT:

I believe I figured it out. This seems to work.

Tfn(n)=5
for n=1:700000
   Tf(n)=(1/32)*L(n)+(1-(1/32))*Tfn(n);  %filter
   Tfn(n+1)=Tf(n)
end

-James

[per isakson]

Try:

    Tf = filter( 1/32, [1,-31/32] , L, 5 );

Answer 1

[Jan]

Tf(1)=5 %Initial value for Tf
for n=1:700000
   Tf(n)=(1/32)*L(n)+(1-(1/32))*Tf(n-1);  %filter
end

Note: This is more efficient due to less operations:

     Tf(n) = (L(n) + 31 * Tf(n-1)) / 32;  %filter

[Elizabeth]

By using for n=1:700000 Tf(n)=(L(n)+31*Tf(n-1))/32; end At the first loop, Tf(n-1)=T(0) which will cause an error. Therefore, you have to initialize T(1) outside of the loop and use for n=2:700000

Answer 2

[Elizabeth]

Something that may be more efficient for your code is:

Tfn(1)= 5 % initial value of Tfn
for 2:700000
Tfn(n)=(1/32)*L(n-1)+(1-(1/32))*Tfn(n-1); %filter
end
Tfn=Tfn(n)

[shiv gaur]

this is your last problem you answer but value is not right

[shiv gaur]

sorry for answer this was not for this