Adding element to a list inside a module

Asked Feb 24 '17 at 05:44

Active Feb 24 '17 at 06:19

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I am kind of new to mathematica and have done earlier programming in C,C++, Java and most recently MATLAB. This is why i am facing some issues in understanding the syntax. I just wish to add an element to a list inside a Module. The element is not a number and so AppendTo is not working. When i try to use Append as in : a = Append[a,g1a] where a is the list and g1a is the element which i wish to insert, it gives a

"Lists {p,q} and {p,q,g1a,g1b} are not the same shape." error.

I looked at some posts and they suggest using Hold attributes but I am not able to understand the logic that is going behind and how I should implement it. The code is :

function[list_]:= Module[{i},

For[i=1,i<= 3,i++, 
       list = Append[list, Symbol["g" <> ToString[i] <> "b"]];
]

Any suggestions will be greatly appreciated.

edited Feb 24 '17 at 06:19

Kuba

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asked Feb 24 '17 at 05:44

Abhishek Pal

The issue is actually the fact that list is a parameter, not the module. Try replacing the first line with function[oldList_]:= Module[{i,newList=oldList},. The rest should go through. – jjc385 Feb 24 '17 at 05:55
Take a look at Attempting to make an assignment to the argument of a function in linked topic. That should make things clear. – Kuba Feb 24 '17 at 06:18
it works surprisingly well but can you please explain what the syntax means ?? – Abhishek Pal Feb 24 '17 at 06:19
Kuba thanks for the link that cleared up stuff – Abhishek Pal Feb 24 '17 at 06:20

Adding element to a list inside a module

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