For Loop Backwards Help

This is my code. And these are the values it produces.

0 5.0000 9.6000 13.8320 17.7254 21.3074 24.6028 27.6346 30.4238 32.9899 35.3507

 x = zeros(1,10);

 for i = 1:10

    x(i+1) = x(i) + ((5 - (4/50)*x(i)));

 end
 display(x)

I want the code to now run backwards now. I want to start at the 35.3507 value and run backwards now 10 times. But I cannot seem to make it work. Any help would be great.

Thanks

Answer 1

[Star Strider]

Here you go:

   x = zeros(1,11);
   for i = 11:-1:2
      x(i-1) = x(i) + ((5 - (4/50)*x(i)));
   end
   display(x)

x =
       35.351        32.99       30.424       27.635       24.603       21.307       17.725       13.832          9.6            5            0

You have to set the loop up to decrement, begin with 11, stop at 2, and decrement the index reference on the LHS of the assignment in the loop.

[WhatIsMatlab-]

Thank you!! I see what I was doing wrong compared to yours.

[Star Strider]

My pleasure!

If my Answer solved your problem, please Accept it.

[WhatIsMatlab-]

I will accept it. But I have one more question what if I wanted to start the process at a certain value instead. What would I do?

I would like the value to start at like 40 and then count down from there.

Thanks

[Star Strider]

If I understand correctly what you want to do, to start the loop from 40 and count down, just change the beginning loop index:

for i = 41:-1:2

To start at ‘N’, the loop index has to start at N+1 and stop at 2 because of the way the indexing works.

My pleasure.

[WhatIsMatlab-]

Yes that is correct as to what I want to do.

[Star Strider]

My pleasure!

[Chakradhar Kakumani]

helped a lot, thanks!

[Star Strider]

My pleasure!