can anyone find the error?

and after RUN

Answer 1

[Sindar]

Perhaps you are calling the function with two few arguments, such as this on the command line:

quadraticc(2)

If you are simply hitting the "Run" button, then the program assumes no inputs at all, and b happens to be the first one it comes across.

Neither of these are bugs in the code, simply incorrect usage. If you want to prevent this, define defaults:

function quadraticc(a,b,c)
arguments
        a (1,1) double = 1
        b (1,1) double = 0
        c (1,1) double = 0
end

[Pawan Acharya]

[Sindar]

you aren't calculating r when k<0, but you still try to display it

Answer 2

[KSSV]

Save the function in a folder...and :

a = 1 ;
b = 2 ;
c = 3 ;   % define your variables
quadratic(a,b,c)