Undefined function or variable 'x'.

function T_lnew= Tnew(x)
global Tl1 Tl8;
for i=8:13
    T_lnew(i-6)=x(i);
    i=i+1;
end
T_lnew(1)=Tl1;
T_lnew(8)=Tl8;

[KSSV]

How did you call the function? Don' run the function...give input and call it.

Answer 1

[KALYAN ACHARJYA]

May Be??

function T_lnew=Tnew(x)
for i=8:13
    T_lnew(i-6)=x(i); 
end

Command Window:

>> Tnew(1:20)
ans =
     0     8     9    10    11    12    13

No Need to defined global variable, as T_lnew is the return to main script, so you can acess the all elements of T_lnew from Main script

And based on indexing of x, it must be vector with more than 5 elments, also the start index position is 2 =(8-6), so it return the 0 in first index position

Also if you want to assign specific T_lnew index position, it must be pass to the the function or same can be done in main script.

To Calling a function in MATLAB see @Stephan's Answer here or search matlab documenation

[Stephen23]

No need to use square brackets:

https://www.mathworks.com/matlabcentral/answers/35676-why-not-use-square-brackets

[madhan ravi]

Tnew(1:20)

[KALYAN ACHARJYA]

@Stephen & @Madhan Sorry..missed it again Thanks Always.