CODEWITHSUNDEEP
matlabsequence
Ali Jimenez
Ali Jimenez

Reputation: 43

Colon operator in MATLAB for defining a sequence vector

I have always used colon operator in MATLAB to create a vector in the following way:

j:i:k => [j, j + i, j + 2i, ..., j + m * i]

but now I need to creat a vector like that:

[i, 2i, 4i, 8i, 16i, ... etc]

How can I do this using the colon operator?

Upvotes: 1

Views: 2050

Answers (2)

gevang
gevang

Reputation: 5014

You have previously defined an arithmetic sequence using some variable i, i.e. 

n = (0:4); 
i = 2;
a = i*n; 

>> i*n

ans =

     0     2     4     6     8

What you are trying to define now is a geometric sequence, or 

a = i*2.^n

>> i*2.^n

ans =

     2     4     8    16    32

You can also use the above to define complex sequences using the imaginary unit i instead 

a = 1i*2.^n

Upvotes: 1

Petar Ivanov
Petar Ivanov

Reputation: 93000

You can do something like this:

(2.^[0:n]) * i

Upvotes: 3

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