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I need to write a program for interpolation and i dont know how

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Do not get me wrong! I have no such program to give you, but a few recommendations.
Read the theory on interpolation and understand it well. Choose one interpolation algorithm-look for something that is not too complicated.
Write a program in your native language (preferably English, because the commands of the TI89Titanium are in English):

  1. Starting from the initial data, state the sequence of steps you would have to perform to get the end result. That is the algorithm.
  2. Translate the steps in abbreviated English (pseudo code).
  3. Better write a step for each action (instruction)
  4. Run it in your head. Use some simple data that you could find in books, references.
  5. If you see that the program should do, translate each statement in the language of the TI89 Titanium.
  6. Respect the syntax of the commands
  7. All the available commands are detailed in the appendix to the book. There, you find each single command with its syntax, parameters, variables, and error conditions).
You can try or for any program you might look at to get some inspiration.

Posted on Feb 02, 2010


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Sorry, I don't have that calculator, but let's see if we can work this out. "Linear Interpolation" means find the value of y for a given value of x from a line of best fit, within the range of values that you are given.

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check the sender. first.
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How to interpolate

Hi there,

In Stat mode (press MODE 1) choose the type of data you are working with, e.g linear or quadratic data.
Type in your data points by typing in the x-value pressing (x,y) button, the y-value and CHANGE.
Once you have entered all your data press the ON button.
If you want to predict or interpolate the x value given the y value, you need to type in the y-value and press 2nd F and the ( button. Do you see above ( there is an orange x'?
To predict the y-value, type in the given x-value and then press 2nd F and ) button. Again above this button in orange you will see y'.
If you would like the equation of the line you will see a blue a, b and c above the ( button, ) button and x button. Use the ALPHA to access these functions.

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Interpolation on TI 89

No you don't have to download a interpolations program, you can enter it in as a function like this:

:yy1+(yy2-yy1)*((x-xx1) / (xx2-xx1))

How I do it is, I put it in a folder dc so, you create a folder name dc

2nd key then - key which will be the VAR-LINK key
hit F1 key then the 5 key to create a new folder. Type in what you want to call your folder in my case dc and hit enter.
Hit APPS key then 7 key then the 3 key, then you see the word program highlighted open it up and change to Function hit enter.
Then slide down to your new folder you just created in my case dc, once you find it highlight it and hit enter.
slide down to variable and type dc and hit enter.
Next, type in or make it look like this:


Now when I'm at the home screen in the main folder, I type:
And I get 40 for my answer.
Here's my logic:
0,0 is the starting point, let's say my circuit max voltage is 5 volts and my max resistance is 100 ohms. I want to interpolate or know how many ohms I would have if my circuit measured 2 volts, which is 40 ohms.
Now if I had ohms and wanted volts I just set it up like this:
which equals 2 volts
i hopethis helps you. raklein62

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You didn't say so but I believe the TV you're using that having the problem is a TV that uses motion compensating frame interpolating technology... a common feature with 120hz and 240hz LCD TVs. I have one of these types of TVs and I have this issue with ABC as well. ABC has begun dropping video frames from some of their primetime shows (the ones that start at the 8e/7c time slot seem most effected) to speed up the broadcast to a point where they can get an extra commercial in. On normal TVs, including the older 60hz LCDs, this is not really noticeable. However, for the motion compensating frame interpolating technology, the TV's video processor must sync up with the 'telecine' processing (conversion from the originally filmed 24fps to broadcast 60fps) so that it can eliminate the copied frames that the telecine processing produces before it can create the interpolated frames between the original frames. When the TV's processor hits a missing frame, it loses sync and has to rejoin and causes the jerky motion you're seeing.

For a solution, you can turn off the motion compensating frame interpolation tech on your TV. Each manufacturer calls it something different but the name will have something to do with smoothing out motion like 'Smooth Motion'. In this case, you need it off for the motion to be it's smoothest (not the case with most TV though).

For a better solution, send a complaint to ABC and your local ABC affiliate.

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