如何在Matlab中向向量添加元素

Question

I've looked around on the internet a bit and cannot seem to find the answer to this question. I want to declare a vector in matlab and then have a for loop that will add an element to the vector each time I go through the for loop.

This is what I've tried and it doesn't seem to be working

vector[];

for k = 1 ; 10
%calculate some value
%calculated value stored in temp variable
vector(k) = temp;
end

This does not work. Does anybody know how to solve this issue?

Answer 1

As ypnos said, you don't need to declare the vector variable upfront. For example if you did:

vector(50) = 1;

MATLAB would make a vector of length 50 with the 50th value being 1. If you want to improve performance and want to create a vector of the proper size beforehand then do the following:

vector = zeros(10, 1);

The code as you have it (as long as you fix the loop as ypnos said) will work, except for how you declare vector, which is not correct. I bet you are getting the error message: "Error: Unbalanced or unexpected parenthesis or bracket." You do not specify whether a variable is a matrix/vector in MATLAB.

Answer 2

vector = [vector; temp];

要么

vector(end+1) = temp;