distance between vectors in matlab???

hi

i have a vector of 85*1 size and a matrix contains 85*396.

i need to find the distance between the 85*1 vector and all the vectors(columns ) of the matrix gamma and returns the closest distance and the column that give me this distance , how can i do this by matlab ???

thanks for all

Answer 1

[Titus Edelhofer]

Hi,

bsxfun is your friend:

x = rand(85, 1);
A = rand(85, 396);
dist = bsxfun(@minus, A, x);
dist2 = sqrt(sum(dist.*dist));
[mindist, column] = min(dist2);

Titus

[mmm ssss]

hi

if i use vector named features(85*1) ang gamma(85,396)

do you that i write

featurs = rand(85, 1);

gamma = rand(85, 396);

dist = bsxfun(@minus, gamma, features);

dist2 = sqrt(sum(dist.*dist));

[mindist, column] = min(dist2);

is using the (rand) function will affect my values within features and gamma or not ??thank you

[Titus Edelhofer]

Hi,

x and A were just examples, I thought that the matrix (gamma) and the vector (features) are given. So: remove the first two lines above and start with the line dist = ..., if variables gamma and features are there ...

Titus

[mmm ssss]

O000k .but i think that measuring the similarity between the vectors by finding distances between them is not very good , isn't it ?can i know your opinion?

Answer 2

[Thomas]

This might help.. http://www.mathworks.com/help/toolbox/nnet/ref/boxdist.html

doc boxdist

The box dist should give you distance between position vectors.

Follow the example given int he documentation

[mmm ssss]

thanks alot

[mmm ssss]

thanks alot