Display an Error Message

Hi , ive tried to write a function which would Display an error but for some reason i dont know why, but it dosent work ,and i dont know where i wnet wrong .I want n to denote the positive integer that is greateer than or equal to 3 or otherwise the function will display ''error.your input is invalid

n=input ('sequence_matrix_');
if n > 3
disp ('Error. Your input is invalid.');
else
    fib=[1,3:n];
    for i=3:n
fibb(i)=fibb(i-1)*3+fibb(i-2);
    end
end

diag(fibb)

Answer 1

[Star Strider]

The code works. The if logic is the opposite of what you indicated that you want.

Correcting that (and a couple other small problems) —

n = 2

n = 2

if n < 3
disp ('Error. Your input is invalid.');
else
    fibb=[1,3:n];
    for i=3:n
        fibb(i)=fibb(i-1)*3+fibb(i-2);
    end
end

Error. Your input is invalid.

if exist('fibb')
    diag(fibb)
end

n = 4

n = 4

if n < 3
disp ('Error. Your input is invalid.');
else
    fibb=[1,3:n];
    for i=3:n
        fibb(i)=fibb(i-1)*3+fibb(i-2);
    end
end

if exist('fibb')
    diag(fibb)
end

ans = 4×4

1 0 0 0 0 3 0 0 0 0 10 0 0 0 0 33

.

[Sona H]

o i see thank you

[Star Strider]

As always, my pleasure!

.