How to skip inputs in a function?

I have a function: y= signal(T,T_set,P,I, D, N)

There's a variable x which equals to T- T_set.

If the length of x equals 1, I need to skip the D and I terms of the function.

This is what I have so far:

function y= signal(T,T_set,P,I, D, N)

x= T- T_set

k=length(x)

if k==1

How do I proceed to skip D and I?

[David Hill]

Don't understand your question. You don't have to use the inputs in your function and certainly don't have to use them in any order.

Answer 1

[Voss]

If you mean that you want to be able to call the function with on or the other of two different sets of input arguments, one set being T,T_set,P,I,D,N (in that order) and the other set being T,T_set,P,N (in that order) (and whether the length of x = T-T_set equals 1 is how you can determine which set of inputs is being given), then you can do something like this:

function y= signal(T,T_set,P,I, D, N)
x= T- T_set
k=length(x)
if k==1
    % in this case, the fourth input argument "I" 
    % is actually the value of N
    N = I;
end

But if that's what you want to do it's probably clearer to use the nargin() function to tell you the number of input arguments given, in which case the dependence on length(x) == 1 is lost:

function y= signal(T,T_set,P,I, D, N)
if nargin == 4
    % in this case, the fourth input argument "I" 
    % is actually the value of N
    N = I;
end

It's hard to know if using nargin() instead of length(x) == 1 is a good idea here without knowing more about what the function is supposed to do and how it's supposed to be used.