Question

**Given:**

**function f = fibonacci(n)**

**% FIBONACCI Fibonacci sequence**

**% f = FIBONACCI(n) generates the first n Fibonacci
numbers.**

**f = zeros(n,1);**

**f(1) = 1;**

**f(2) = 2;**

**for k = 3:n**

**f(k) = f(k-1) + f(k-2); end**

**AND**

**function f = fibnum(n)**

**if n <=1**

**f =1;**

**else**

**f = fibnum(n-1) + fibnum(n-2);**

**end**

**In Matlab, modify fibonacci.m and fibnum.m to compute
the following sequence.**

**dn = 0, n<=0**

**d1 = 1,**

**d2 = 1**

**and, for n > 2,**

**dn = dn−1 + dn−2 − dn−7**

Answer #1

**Modified MATLAB Code:**

```
function d = fibonacci(n)
d = zeros(n,1);
d(1) = 1;
d(2) = 1;
for k = 3:min(n,7)
d(k) = d(k-1) + d(k-2);
end
for k = 8:n
d(k) = d(k-1) + d(k-2) - d(k-7);
end
function d = fibnum(n)
if n <= 0
d = 0;
elseif n <= 2
d = 1;
else
d = fibnum(n-1) + fibnum(n-2) - fibnum(n-7);
end
```

**Please refer to the following picture for the sample
execution of the above code:**

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Write and upload a
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(a)
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(b)
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