how can i write function to display matrix?

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hassan elkholy 2020-12-23

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回答： Masoud Dorvash 2021-1-18

how can i write function to display a zero matrix and its diagonal calculated by function

f(n) = f(n-1)+2f(n-2)+3

it has only one input n

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Walter Roberson 2020-12-23

If you start with an all-zero matrix then every element of the matrix will be the same for any given n, so it seems odd to talk about the diagonal.

You would need a matrix multiplication step to perturb the elements so that the diagonals were not all the same.

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Answer 1

Masoud Dorvash 2021-1-18

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Hello,

You just need to use

D = diag(v);

This command will create a matrix with the elements of v on the main diagonal.

Try to first create your v vector (here in your example is f(n)) then put it there.

v = [1 6 2 14 1 8 46];
diag(v)
ans =
   0     0     0     0     0     0
   6     0     0     0     0     0
   0     2     0     0     0     0
   0     0    14     0     0     0
   0     0     0     1     0     0
   0     0     0     0     8     0
   0     0     0     0     0    46