how to use a parameter name list as input for a function?

Dear All,

I have a tryparel function as below

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function out=tryparel(paramlist)

      disp(a)
      disp(b)
      out=a+b;

%%%%%%%%%%%%%%%%%%%%%%%%%%%

To use this function above I would like to do below

paramlist=['a,' , 'b'];
out=tryparel(paramlist)

BUT I always get errors. Can anyone help me about this?

I have to write a script calling this type of function where the input variable list is really long.

Thanks

Answer 1

[Sven]

Skirt, you were very close. You just need to use a cell array:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function out=tryparel(paramlist)
      disp(a)
      disp(b)
      out=a+b;
%%%%%%%%%%%%%%%%%%%%%%%%%%%

paramlist = {4 , 10};
out = tryparel(paramlist{:})

If you instead want to do something like this:

a = 4;
b = 10;
paramlist = {'a','b'};

... then don't do this. Instead use a structure such as:

P.a = 4;
P.b = 10;
paramNameList = {'a','b'};
paramList = cellfun(@(name)P.(name), paramNameList, 'Un',0)
out = tryparel(paramList{:})

Did this answer your question? If so, be sure to hit "accept".

[Skirt Zhang]

Hi Sven,

Thanks a lot for your help. However when I execute the code P.a = 4; P.b = 10; paramNameList = {'a','b'}; paramList = cellfun(@(name)P.(name), paramNameList, 'Un',0) out = tryparel(paramlist{:})

it shows error message ??? Undefined variable "paramlist" or class "paramlist".

%%%%%%%my function is written as below out = tryparel(paramlist ) function out=tryparel(paramlist )

    disp(a)
    disp(b)
    out=a+b;

Do you know what can be wrong here?

Thanks

[Sven]

Oh, small typo. Use:

out = tryparel(paramList{:})

instead of:

out = tryparel(paramlist{:})

In my last example I used some capital letters to help distinguish between paramNameList (which is just the set of variable names to use) and paramList which is the actual variables.

[Skirt Zhang]

thanks a lot