# Matrix On Lua

15 replies to this topic

### #1 Colombia

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Posted 13 April 2007 - 04:14 AM

how can i write this on Lua :

On basic:

[[1,2][3,4]] => Mat_A
6 => Mat_A[1,1]
PrintNatural Mat_A

Thanks!!!!!!!!!!!!!!!

### #2 girdeux

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Posted 13 April 2007 - 01:29 PM

how can i write this on Lua :

On basic:

[[1,2][3,4]] => Mat_A
6 => Mat_A[1,1]
PrintNatural Mat_A
Thanks!!!!!!!!!!!!!!!

```A={{1,2},{3,4}}
A[1][1]=6

for i=1,#A do
print(unpack(A[i]))
end```

That's all..

### #3 The_AFX_Master

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Posted 13 April 2007 - 06:40 PM

Colombia... i have a library that makes easy the matrix/list manipulation.. even easier than Basic.. I'm so busy at now because the Formula SAE tune up.. ( Competition is in 34 days!).. so, i'll upload it soon.. at least less than a week

### #4 Colombia

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Posted 23 April 2007 - 09:27 PM

why this doesn`t work

require("cas")
Mat_A={}
d=input("Dimension of the Matrix:")

for i=1,d do
for j=1,d do
n=input("element "..i..","..j..":")
Mat_A[i][j]=n
end
end

### #5 The_AFX_Master

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Posted 23 April 2007 - 10:16 PM

Colombia, don't use the CAS package with LUA to manipulate matrices. ,is weird. Lua tables are powerful enough to handle matrices. see your email today. i'll send you a package for matrix manipulation that make these tasks far easy.

### #6 Orwell

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Posted 24 April 2007 - 08:41 AM

Anyway, this will actually work:

require("cas")
Mat_A={}
d=input("Dimension of the Matrix:")

for i=1,d do
Mat_A[i] = {} -- initialise each row as a table before inserting new elements!
for j=1,d do
n=input("element "..i..","..j..":")
Mat_A[i][j]=n
end
end

### #7 PAP

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Posted 24 April 2007 - 10:40 AM

*Sigh* Matrix manipulation in CPLua is primitive, just as in C/C++; we had a looong discussion about that in the past, and the conclusion was that matrix manipulation will remain primitive, because the short-lived "mat" package was unavoidably slow.

Anyway, don't use the CAS within CPLua, unless you need it disparately. In this case, you don't have any reason to do so: using the CAS will only make your program slower. Use CPLua's "tables" instead; they are weird, but at least the job can be done.

### #8 Colombia

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Posted 24 November 2007 - 03:00 AM

Why CpLua doesn't have a horizontal scroll???
When i uses this code
```A={{1,2},{3,4}}
A[1][1]=6

for i=1,#A do
print(unpack(A[i]))
end```
with a matrix 6 x 6 complex it show a desaster. The element of the same row continuo on the next line, it is confuse.

Thanks

### #9 Orwell

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Posted 26 November 2007 - 10:28 PM

There is indeed no horizontal scrollbar in the Console window (that you see when you use the "print()" function")...

I would suggest you to try the UI package, there is a nice "mathedit" component that you might use to display mathematical expressions like matrices and CAS formulas

### #10 Colombia

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Posted 16 February 2008 - 04:57 PM

I would suggest you to try the UI package, there is a nice "mathedit" component that you might use to display mathematical expressions like matrices and CAS formulas

Orwell, I read the "uifunction.txt" but I could not find the function than make this possible.
I learned how to create a window (ui.windows{...}) and included some text editable or not (ui.textedit{..}) and other things, but what is the function that allow me to call the matrix?

Thanks!!!

### #11 Orwell

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Posted 16 February 2008 - 08:53 PM

Orwell, I read the "uifunction.txt" but I could not find the function than make this possible.
I learned how to create a window (ui.windows{...}) and included some text editable or not (ui.textedit{..}) and other things, but what is the function that allow me to call the matrix?

Thanks!!!

You can try something like this to display a matrix (or any other CAS expression):
```require "ui" "cas"
local win, me

win = ui.window({name="Test", x=3, y=3, width=154, height=180})

me = ui.mathedit({x=0, y=0, width=152, parent=win})

me:setexpr(cas("[[1,2][3,4]]"))

ui.button({text="Quit", x=122,y=79, parent=win,
_clicked = function(self) ui.stop() end})

win:show(true)
ui.start()```

### #12 Colombia

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Posted 17 February 2008 - 01:43 AM

I copy to the CPLua on my PC and works but on my ClassPad doesn`t.

attempt to call field "mathedit" (a nil value)

### #13 Orwell

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Posted 17 February 2008 - 06:46 PM

Are you sure you have the last version (0.9E)?

### #14 Colombia

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Posted 17 February 2008 - 09:12 PM

ohhhhhhhh, I have the 0.9D.

Thanks

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Posted 06 June 2013 - 04:11 AM

how can i work with matrix on lua??
i mean i wanna run a program and i need to know how can i write some matrix?
for example 3*3 such as :
3 3 3
2 7 9
1 3 11

### #16 MicroPro

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Posted 06 June 2013 - 07:04 AM