How dist function works??

18 次查看（过去 30 天）
Archana Goyal
Archana Goyal 2015-3-6
评论： Archana Goyal 2015-3-22
If w=rand(4,3); p=rand(3,1);
z=dist(w,p)
ans is 0.4278 0.6786 0.3725 0.6324 how these values comes?
  1 个评论
Archana Goyal
Archana Goyal 2015-3-22
Code for calculating Euclidean distance for music signals in matlab???

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Christiaan
Christiaan 2015-3-9
编辑：Christiaan 2015-3-9
The dist function is a 'Euclidean distance weight function' which applies weights to an input to get weighted inputs. At your example:
W is the (random) weight matrix. P is the input vector Z is the weighted input
If you type in the matlab prompt 'edit dist.apply' you find the formula behind this function. For your example, the weighted matrix is subtracted from the transposed and copied vector. Now it is squared and then the square root is taken. This is how the Euclidian norm is defined Norm = square((a-b)^2)
I have copied the code and made the example simpler to understand in the code below better:
clc;clear all;close all;
p=[1;2;3]
w=[1 1 2;1 1 1;1 2 1;1 1 1]
z1=dist(w,p)
% dist function
S = size(w,1);
Q = size(p,2);
z2 = zeros(S,Q);
if (Q<S)
p = p';
copies = zeros(1,S);
for q=1:Q
z2(:,q) = sum((w-p(q+copies,:)).^2,2);
end
else
w = w';
copies = zeros(1,Q);
for i=1:S
z2(i,:) = sum((w(:,i+copies)-p).^2,1);
end
end
z2 = sqrt(z2)
Here z1 and z2 should give the same answer.
I hope this makes it clearer.
Kind regards, Christiaan

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Define Shallow Neural Network Architectures 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by