22 replies to this topic

[uterrorista]

Is there any program/add in that could make Lagrange interpolation.?

Thanks

[PAP]

Is there any program/add in that could make Lagrange interpolation.?

Well, it isn't difficult to write a program for this (in CPLua, of course), but do you really need it? Lagrange interpolation is usually not the best choice. Do yourself a favor, use cubic splines instead. It's way more precise in most cases. I've included linear and cubic spline interpolations in LNA, but not Lagrange (and I'm not planning to add it).

[Behnoud]

Can you release english edition,please?!

[PAP]

Can you release english edition,please?!

English edition of what? If you mean a version of Lagrange interpolation, my answer is no. It can be easily done in CPLua, but, as I have explained before, Lagrange interpolation is superseded by Cubic Spline interpolation. I 'm not planning to add poor algorithms in LNA, and Lagrange interpolation is a poor algorithm, useful only for pedagogical purposes. In general, introductory algorithms will never included in LNA.

[uterrorista]

thank you all.

i want to aplly an interpolation to, example:

2 line matrix:

x: | 1433| 2750| 3683| 4200| 4516|
y: | 5000|10000|15000|20000|28000|

i want to know y, when x=3940..

something like this...

i still can?t do this.. Can someone show me how? Thanks.

[PAP]

thank you all.
i want to aplly an interpolation to, example:
2 line matrix:

x: | 1433| 2750| 3683| 4200| 4516|
y: | 5000|10000|15000|20000|28000|
i want to know y, when x=3940..
something like this...
i still can?t do this.. Can someone show me how? Thanks.

Use LNA to do cubic spline interpolation. For example, the following CPLua code will return y for a user-defined x:

require("LNA/CSpline")
local xdata,ydata,scoeff,x
xdata={1433,2750,3683,4200,4516}
ydata={5000,10000,15000,20000,28000}
scoeff=CreateSpline(xdata,ydata)
x=input("Give x:")
print(CubicSpline(x,0,xdata,scoeff))

You can also calculate interpolating 1st and 2nd order derivatives if you want. See LNA manual, especially pages 48-52

P.S.: Why do I spend hours ans hours to write LNA's documentation, since none wants to read it?

[uterrorista]

i don't understant that much of LNA.
but i'll try..

I already write that code, but i need LNA/CSpline.. Where can i get it?

LNA's documentation?
Do you refer do the PDF version that is in this page???

[PAP]

i don't understant that much of LNA.
but i'll try..
I already write that code, but i need LNA/CSpline.. Where can i get it?
LNA's documentation?
Do you refer do the PDF version that is in this page???

Hmmm, you are totally confused here. CSpline is part of LNA, a project I'm developing for ClassPad, so you need to install LNA. LNA, in turn, needs a programming language called CPLua to run, so you need CPLua as well (you really don't know anything about CPLua? you use CPBasic so far? )

So, if you want to use the program I have posted, you have to:
(1) Install CPLua. Here is the link, but you really need to read stuff about CPLua itself first.
(2) Install (in fact, transfer) LNA. Here is LNA's topic in the File Sharing, where you will find links to download LNA and its documentation. You will certainly need to read the documentation, at least parts of it.
(3) Write the program I have posted in CPLua's editor and run it.

P.S.: If you expect you will be able to use LNA's capabilities without reading anything, you will be highly disappointed.

[uterrorista]

-you are totally confused here??
You bet..

-CPBasic so far?
Yes.. when i need something more, I'm too busy(studying) and i haven't time to learn...

This evening i'll take a look.. THANK YOU..

[PAP]

-CPBasic so far?
Yes.. when i need something more, I'm too busy(studying) and i haven't time to learn...

Do yourself a favour: whenever you have some free time to spend, run, do not walk, to the CPLua project topic, and forget CPBasic once and for all.

[uterrorista]

the program is not working:

runtime Error:
LNA/CSpline:115: attempt to compare string with number



i edited the program to:

require("LNA/CSpline")
local xdata,ydata,scoeff,x
xdata={1433,2750,3683,4200,4516}
ydata={5000,10000,15000,20000,28000}
scoeff=CreateSpline(xdata,ydata)
x=3940
print(CubicSpline(x,0,xdata,scoeff))

now it works..

[Orwell]

Indeed, input() returns a string, it must be converted to a number first
The correct line should be

x=tonumber(input("Give x:"))

[PAP]

As you can easily guess, I wrote the program directly in my post, I didn't tried it in ClassPad, because it was very simple. As it always happens with simple things, I forgot something: input() returns a string. I apologize for that error .

[uterrorista]

No problem.

the only programmation language i know is C... the 'mother' of all languages i think.
where can i learn a bit more of this CPLua language??

[PAP]

the only programmation language i know is C... the 'mother' of all languages i think.

Totally incorrect. The first high-level programming language was Fortran, introduced in 1956, decades before C. Since then, Fortran has been upgraded several times, and today is a full module-oriented programming language, ideal for mathematical programming (where C/C++ s*cks hard).

where can i learn a bit more of this CPLua language??

Start here, and please search casiocalc a little bit, before asking something already answered.

[uterrorista]

Totally incorrect. The first high-level programming language was Fortran, introduced in 1956, decades before C. Since then, Fortran has been upgraded several times, and today is a full module-oriented programming language, ideal for mathematical programming (where C/C++ s*cks hard).

Start here, and please search casiocalc a little bit, before asking something already answered.

Perhaps i exagereated when i said 'the mother of all languages'..
But C is a very inportant language .This language influenced: awk, csh, C++, C#, Objective-C, BitC, D, Concurrent C, Java, JavaScript, Limbo, Perl,PHP..

I've already saw that PDF guide. i only asked beacause you know the language and i wanted the best guide...

Thanks

[Orwell]

Nonono, never try to discuss about C and Fortran

(Fortunately for you, the Lua language is closer from C than Fortran, so don't worry )

[The_AFX_Master]

Engrish is the best of the programming languages


#include all_your_base_are_belong_to_us.h

[PAP]

Engrish is the best of the programming languages
#include all_your_base_are_belong_to_us.h

"Engrish"? . If you mean "English", I strongly disagree. English is a rather poor language, compared to my native language, or German, or French .
Anyway, there is no "best programming language". You want to write a mathematical program? Fortran. An applet game? Java. An operating system? C++. A graphical user interface? all of the above languages will do, and even more.

[The_AFX_Master]

Dude!.. Engrish!.. WITH R.. see Engrish on Wikipedia. For sure you don't remember the ALL YOUR BASE ARE BELONG TO US joke

[PAP]

Dude!.. Engrish!.. WITH R.. see Engrish on Wikipedia. For sure you don't remember the ALL YOUR BASE ARE BELONG TO US joke

Ok, I admit it (but don't tell it to anyone): I knew nothing about "Engrish" and the "All our base are belong to us" joke . Funny and horrible translation, even my English is better than this .

ALL YOUR ClassPad ARE BELONG TO ME

[ASTRO491K]

I really enjoyed reading the exchange you guys have had, so let me ask you both, what do you think of the TI-nspire programing (and restrictions). (Please don't throw things at me, I just want to find out if your evaluation is similiar to mine.)

i need help in translating C++ programs into casio ones:

im working on lagrange interpolation right now,

if i start with this loop (from C++)

for (i=0; i<=n; i++)
{
cin >> x[i] >> y[i];
}

translating it to casio,
for 0->I to N step 1
"X[I]" ? -> // going to wat ? how can i put an index in casio ?
"Y[I]" ? -> //same question
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