Integrating a variable into a file name?

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Forum Attachments

Summary:

trying to use a dynamic file reference with a for loop

Integrating a variable into a file name?

fysicsandPholds 20 Mar 2010 15:38

I am creating a program that requires the manipulation of several files of a similar title (Appfolder/mat*x*)
where x represents a number between 1 and 10. (so the files i am working with are called mat1, mat2, mat3, mat4,..etc)
I want to know if there is a way I can call upon these files with a variable so I can use a for loop to repeat a similar procedure on them
whenever i try just calling upon matx it just thinks I mean a file called matx not mat1 or mat2 or whatever x equals?
Example
For i,1,10,1
For x,1,3,1
For y,1,3,1
Define Appfolder/mat*i*[x,y]=…etc.
EndFor
EndFor
EndFor

*Edit* matx is not a program. It is a matrix variable I need to edit within the context of a program

Last edited on 20 Mar 2010 16:17 by fysicsandPholds Show more

Re: Integrating a variable into a file name?

Chokladkakan 20 Mar 2010 15:59

I might be misunderstanding you, and if so, please forgive me, but here goes:

You know how you have to write () after a program name in 68k? Well, if you in the program code

name()
Prgm
EndPrgm

write

name(x)

you can call upon the entered variable x later within the program!

Last edited on 20 Mar 2010 16:00 by Chokladkakan Show more

Re: Integrating a variable into a file name?

Dakotah 05 Sep 2010 03:07

To use a variable as part of a file name, use the indirection (#) operator. So in your case, if x is a number from 1 to 10, you can use #("mat"&string(x)). An example:
:prog1()
:Program
:For x,1,10
:x*x→#("var"&string(x))
:EndFor
:EndPrgm

Re: Integrating a variable into a file name?

majaron 12 Feb 2011 11:17

Hi, I'm new around here and before asking something i found this thread, where this part of code that @Dakotah wrote is exactly what i need:

:prog1()
:Program
:For x,1,10
:x*x→#("var"&string(x))
:EndFor
:EndPrgm

I would like to get ("var"&number of time this thing loops) So in this case "var"1,"var"2…"var"10

But it doesn't work. I always get tihis: Indirection string is not a valid variable name

Any ideas to make this work.

Re: Integrating a variable into a file name?

BlakPilar 07 Sep 2010 21:03

[SORRY Did not mean to post.]

---

Projects: BexIDE (hold), Hadean.NET, Legend of Zelda: Link to the Future

Last edited on 07 Sep 2010 21:04 by BlakPilar Show more

Re: Integrating a variable into a file name?

Xeda Elnara 12 Feb 2011 16:20

This worked for me:

test()
Prgm
For x,1,10
x*x→#("var"&string(x))
EndFor
EndPrgm

---

Z80 Assembly>English>TI-BASIC>Python>French>C>0

Re: Integrating a variable into a file name?

majaron 12 Feb 2011 19:40

Didn't for me. Don't know why.

I then did something like @Chokladkakan suggested at the bottom. It works but it's ugly.

Re: Integrating a variable into a file name?

fysicsandPholds 20 Mar 2010 16:13

Thanks for the help but I think I was a little unclear
I know how to do this in Java so I'll give an example of the same type of thing in java

File tempFile;

for (int i=0;i<10;i++){
tempFile = new File("/exampleproject1/"+i+".example");
tempFile.doSomething;}

that program would preform the method doSomething for the files (/exampleproject1/) 0.example, 1.example, 2.example, 3.example, etc.
In this Java program the way I integrated the filename with the variable was ("/exampleproject1/"+i+".example")
I need some equivalent of this in TI Basic

Re: Integrating a variable into a file name?

Chokladkakan 20 Mar 2010 16:21

Alright! I am not entirely sure if something equivalent is possible to do in 68k Basic, but instinctively, I see another solution, but perhaps not as elegant: if you let exampleproject1/ include all the different variations, sorted into conditional statements and then you call exampleproject(x) and if x is 5, do 5.example. Would that work?

I made a small example to test if my idea worked, which it does:

:test2()
:Prgm
:For t,1,6
:test(t)
:EndFor
:EndPrgm

:test(x)
:Prgm
:If x=1 Then
:Disp "Hello!"
:ElseIf x=2 Then
:Disp "Hey! How are you?"
:ElseIf x=3 Then
:Disp "I'm good, thanks. You?"
:ElseIf x=4 Then
:Disp "I'm great, thanks for asking."
:Else
:Disp "Bye!"
:EndIf
:EndPrgm

Which, when running test2() outputs:

Hello!
Hey, how are you?
I'm good, thanks. You?
I'm great, thanks for asking.
Bye!
Bye!

Last edited on 20 Mar 2010 17:12 by Chokladkakan Show more

Re: Integrating a variable into a file name?

Xeda Elnara 12 Feb 2011 19:53

Ah, sorry I am not familiar with java. I am familiar with TI-89 BASIC and I do understand indirection, though. The example I gave stored the value X^2 into varX where X is a number from 1 to 10. So 100→var10, 81→var9, et cetera.

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Z80 Assembly>English>TI-BASIC>Python>French>C>0

Re: Integrating a variable into a file name?

majaron 12 Feb 2011 20:56

I cleared all the variables and now in works.

I don't get that error any more but I'm not sure what really messed everything up. Thanks for your help.