So I'll jump right into it, I'm in a middle of making a program that right now requires me to substitute a variable based on if B=1...8 so that means 8 different variables and 8 if statements, right? I hope not. The basic premise is that I think there is a way to substitute variables like a For command without it calling the number instead of the symbol of that number because I need to store the output for the f(x) into the variable.
Example Code:
Code: For(B,1,8)
If B=1:Str2->Str0
If B=2:Str3->Str0
If B=3:Str4->Str0
If B=4:Str5->Str0
If B=5:Str6->Str0
If B=6:Str7->Str0
If B=7:Str8->Str0
If B=8:Str9->Str0
End
Potential Solutions:
Code: For(B,1,8)
sub(Str2+Str3+Str4+Str5+Str6+Str7+Str8+Str9,B,length(StrB))->Str0
End
Here is a potential solution that doesn't work because variables as far as I know are considered one character in TI-Basic and so inferring a number into a variable prefix doesn't make the prefix plus the inferred number one variable.
This could be easily solved if the strings were all made the same length using .... or [Spaces] at the end, but I'm writing a program to measure pixel value based on the strings contents so adding things at the end could lead to issues and bugs if that said symbol is included in the compared string.
The only real way to so this sanely is to use Ans to your advantage. For example, here's one way that could work:
Code: For(B,1,8)
Str2
If B=2:Str3
If B=3:Str4
If B=4:Str5
If B=5:Str6
If B=6:Str7
If B=7:Str8
If B=8:Str9
Ans->Str0
End
Of course, there are a couple other ways, but this may be the fastest and smallest in pure basic. Hope this helps to some degree! 
Why is this in a for loop? It'll always finish the loop with the final case.
You could try using expr( to make the string of "Str" added to a string of the value of B. Maybe this?
Code: For(B,1,8)
expr("Str"+sub("23456789",B,1))->Str0
End
I didn't test to see if this works, but I know that if you do expr("Str1")->Str0 works, so this might?
Haobo wrote:
You could try using expr( to make the string of "Str" added to a string of the value of B. Maybe this?
Unfortunately, this will not work. Str1 (for example) is a single token, not Str followed by a 1. expr("Str1") works because expr("Str1") is just the contents of Str1.
KermMartian wrote:
Haobo wrote:
You could try using expr( to make the string of "Str" added to a string of the value of B. Maybe this?
Unfortunately, this will not work. Str1 (for example) is a single token, not Str followed by a 1. expr("Str1") works because expr("Str1") is just the contents of Str1.
Would this work?
Code: For(B,1,8)
expr(sub("Str2Str3Str4Str5Str6Str7Str8Str9",B,1))->Str0
End
Haobo wrote:
Would this work?
Code: For(B,1,8)
expr(sub("Str2Str3Str4Str5Str6Str7Str8",B,1))->Str0
End
Haobo wrote:
KermMartian wrote:
Haobo wrote:
You could try using expr( to make the string of "Str" added to a string of the value of B. Maybe this?
Unfortunately, this will not work. Str1 (for example) is a single token, not Str followed by a 1. expr("Str1") works because expr("Str1") is just the contents of Str1.
Would this work?
Code: For(B,1,8)
expr(sub("Str2Str3Str4Str5Str6Str7Str8Str9",B,1))->Str0
End
YES! Thanks Haobo and Kerm that does work!
This shortens my code extremely, but to give an example here is a gif with some code in action.
Code: "Str2"->Str2
"Str3"->Str3
"Str4"->Str4
"Str5"->Str5
"Str6"->Str6
"Str7"->Str7
"Str8"->Str8
"Str9"->Str9
For(B,1,8)
expr(sub("Str2Str3Str4Str5Str6Str7Str8Str9",B,1))->Str0
Disp Str0
End
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