Scaling positive and negative weights

5 次查看（过去 30 天）
dave
dave 2013-9-22
Hi, I have a vector that contains positive as well as negative weights. For example:
0.75
-0.14
-0.92
0.56
-0.28
...
Now I need a way to transform these weights so that...
  • all weights will be positive.
  • each weight will be greater than 0 and smaller than 1.
  • the weights sum to 1.
  • the more negative the original weight, the lower its new value should be.
How would I do that?

请先登录，再回答此问题。

采纳的回答

Image Analyst
Image Analyst 2013-9-22
Just scale linearly - at least that's one of an unlimited number of ways:
% Declare random sample data.
signal = 20*rand(1,10)-10
% Offset so that the min of the new signal is at zero.
newSignal = signal - min(signal);
% Make the new signal sum to 1
newSignal = newSignal / sum(newSignal)
% Print out the sum, just to check.
fprintf('The sum is %f.\n', sum(newSignal));
  3 个评论
显示 1更早的评论
dave
dave 2013-9-22
编辑：dave 2013-9-22
Thanks, there's only the problem that one of weights will be zero. But I need all of them to be > 0. btw: Don't worry, this has nothing to do with any kind of homework..
Image Analyst
Image Analyst 2013-9-22
Add a very small amount, like eps
newSignal = signal - min(signal) + eps;

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Smoothing and Denoising 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