Assigning Random Weights at each Loop Iteration

Question

A M 2017-1-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/321886-assigning-random-weights-at-each-loop-iteration

评论： Walter Roberson 2017-1-26

I am trying to assign Random Weights (between 0 and 1) in each loop iteration. Could you please guide that how to do the same in this chunk of code, such that W gets new values between 0 and 1 each time the loop repeats itself.

W = [.41 .99 .51 .32 .15 .45 .38 .32 .36 .29 .21];
DG = sparse([6 1 2 2 3 4 4 5 5 6 1],[2 6 3 5 4 1 6 3 4 3 5],W)

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

Andrei Bobrov 2017-1-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/321886-assigning-random-weights-at-each-loop-iteration#answer_251975

在 MATLAB Online 中打开

W = rand(1,11);
DG = sparse([6 1 2 2 3 4 4 5 5 6 1],[2 6 3 5 4 1 6 3 4 3 5],W)

2 个评论
显示无隐藏无

Walter Roberson 2017-1-25

Your original matrix had 11 weights. Your indices now have length 12. You need W = rand(1,12) to match.

A M 2017-1-26

Yes, i figured out. Thanks a lot for the help :-)

请先登录，再进行评论。

Answer 2

Walter Roberson 2017-1-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/321886-assigning-random-weights-at-each-loop-iteration#answer_251991

Have you considered using sprand() ?

2 个评论
显示无隐藏无

A M 2017-1-26

How to use sprand() in this case? If i m not mistaken, sprand() returs a mxn matrix.

In above case, rand(1,12) is returning a vector. Isn't so?

Walter Roberson 2017-1-26

sprand returns an m x n sparse matrix filled to occupancy you specify. The locations are chosen at random.

Your call to sparse() is creating a 6 x 6 sparse matrix and using fixed positions to store the values. That is definitely something that needs to be done sometimes, but if it happens that the code you did not show us is picking out those indices at random then sprand() might be more convenient. Except, that is, that sprand() is filled by probability, not by fixed number of non-zero results.

请先登录，再进行评论。