# How to interpolate

I want to interpolate using this calculator

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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.

Posted on Nov 26, 2014

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Posted on Jan 02, 2017

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### Is there a function for Linear Interpolation, if so, where do I find it? Thanks!

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.

Hopefully, this helps. If not, let me know and we will explore more.

Good luck,

Paul

Apr 22, 2015 | Casio Algebra FX 2.0 Calculator

### How to interpolate with 991MS

i am giving the key input with an example..
example-
at 0, value is 300
at 50, value is 270
so how much at 30...

On 991MS,

Enter the values as follows,

0,300 and press M+ key on the calci
(Note: there is a "," in between 0 and 300)

then enter the following,
50,270 and press M+ key

now enter the following input exactly as displayed below:

(30) shift 2 > > > 2 =

you will get the answer as 282.

I hope you got it!!!

LOFT!!!

Feb 22, 2011 | Casio FX-115ES Scientific Calculator

### How to interpolate in CASIO fx 991 ES

its simple
press mode
3;stat
2;A+Bx
l x l y l
l 2 l 4.6 l
l 4 l 5.9 l
press; AC
press;5.9
press; shift
press;1
press;7 (reg)
press;5 (comma)
press;=
u will get ans

Feb 08, 2011 | Casio FX-115ES Scientific Calculator

### I'm graphing a quadratic equation, I have all my info put into the stat area and nothing in the Y= area. When I graph it the points are small boxes, there is no graph line and it won't allow me to do any...

If you're doing a stat plot, you're plotting a discrete set of points. The calculator doesn't interpolate between the data points.

If you want to graph a quadratic equation, then do so. Enter it in as a Y= equation and plot it as such. This will not only connect the points (unless you tell it not to), but will also allow you to do things like trace.

Mar 03, 2010 | Texas Instruments TI-83 Plus Calculator

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

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 education.ti.com or ticalc.org for any program you might look at to get some inspiration.

Feb 02, 2010 | Texas Instruments TI-89 Calculator

### Interpolation on TI 89

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

:dp(xx1,yy1,xx2,yy2,x)
:Func
:yy1+(yy2-yy1)*((x-xx1) / (xx2-xx1))
:EndFunc

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.
Next,
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.
Next,
slide down to variable and type dc and hit enter.
Next, type in or make it look like this:

:dp(xx1,yy1,xx2,yy2,x)
:Func
:yy1+(yy2-yy1)*((x_xx1)/(xx2-xx1))
:EndFunc

Now when I'm at the home screen in the main folder, I type:
dc\dp(0,0,5,100,2)
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:
dc\dp(0,0,100,5,40)
which equals 2 volts
i hopethis helps you. raklein62

Aug 30, 2009 | Texas Instruments TI-89 Calculator

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