Changing the number of input arguments while calling a function in a loop

Very briefly, I have a for loop of the form:

for i=1:30
   out=myfun(X, in1, in2, ... , inN);
end

myfun takes as input arguments a matrix X and can take upto N vectors after that. What I want to do is, give as input:

out=myfun(X, in(1,:));                          %when i=1
out=myfun(X, in(1,:), in(2,:));                 %when i=2
out=myfun(X, in(1,:), in(2,:), in(3,:));        %when i=3
... and so on..

So for every iteration of the loop, the number of input arguments will increase, and I could not find a way to do this except manually. (And I don't want to manually enter the lines above for 100 different input arguments.)

The only things I could think of doing until now are using string arrays or cell arrays whose size will increase at every iteration but what I want to give as input to myfun() is not a string but a variable name. I have no idea how matlab handles this, and any replies would be greatly appreciated.

Answer 1

[Walter Roberson]

 Put the vectors in a cell array, say Cin, and then

out = myfun(X, Cin{1:N});

However, if you really need to pass in variable names then this will not work for you; inputname() will return empty because these would be expressions instead of variables. If you really need to pass in variable names instead of values, you should explain more about why passing in names is important to your purposes.

[sirona]

Sorry for the confusion, this was exactly what I needed. I am not very familiar with cell arrays myself so I couldn't figure out the syntax I guess. Thanks for your help.

Answer 2

[Teja Muppirala]

The cell array as mentioned above is a reasonable approach. Another possibility would be to modify your function so that the function would recieve the whole matrix "in", along with the index, and then myfun can take care of getting the appropriate rows on its own. Thus your loop would look like this:

for k = 1:30
  out = myfun(in, k)
end