Deleting zeros in front of a vector

Question

amateurintraining 2017-9-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/358146-deleting-zeros-in-front-of-a-vector

评论： amateurintraining 2017-9-24

I have to solve this problem:

Write a function called unpad, which takes a row vector, removes all zeros at the beginning of the vector, and returns the remaining elements of the vector (i.e., it drops the zeros at the beginning of the vector). Assume that at least one element in the array w is non-zero.

However, I only want to delete the zeros in front of the vector (meaning, not including the zeros IN the vector).

Right now, my code is as follows:

function [ vec ] = unpad( w )
%generates a row vector
%   takes a row vector, removes all zeros at the beginning of the vector,
%       and returns the remaining elements of the vector
find(w==0)
end

However, this includes value of zero that are also IN the vector. How do I delete the zeros only at the beginning of the vector?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2017-9-24

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/358146-deleting-zeros-in-front-of-a-vector#answer_282944

编辑：Image Analyst 2017-9-24

在 MATLAB Online 中打开

Close, but you used find incorrectly. You need to use ~= 0 instead of == 0:

unpad([1,0,0,0,4,4,4,0]) % Test with non leading zeros.
unpad([0,0,0,5,5,5,0,0,6]) % Test with leading zeros.
function vec = unpad( w )
%   Takes a row vector, removes all zeros at the beginning of the vector,
%       and returns the remaining elements of the vector
index = find(w ~= 0, 1, 'first');
vec = w(index : end);
end