How do I fill a matrix with values of an one array based on another array?

1 次查看（过去 30 天）
Maraya Biervliet
Maraya Biervliet 2020-7-1
评论： TADA 2020-7-1
Hi,
I have a 1x5001 array Rr which contains radial distances from a pointsource. I also have an 5001x 1 array Wzr which is the weight vs. radial distance. Also there is a constant dr.
Now I need to make a 2D matrix (5000 x 5000) which is Wzr2D(a,b) = Wzr (Rr(a,b)/dr)
For example if Rr(1,2) = 10 and dr = 2 then I need the value of Wzr(5) to be placed in the matrix Wzr2D at the position (1,2).
I am a super beginner at MATLAB and I don't ever know where to begin to link all this together.

请先登录，再回答此问题。

回答（1 个）

TADA
TADA 2020-7-1
编辑：TADA 2020-7-1

If I understood correctly, try this:

Wzr2D(1,:) = Wzr(Rr(1:5000) / dr)

This should work if you can guarantee that all values of Rr/dr are valid indices of Wzr, that is, integers between 1 and 5001

  1 个评论
TADA
TADA 2020-7-1
I'm not sure why you want to dispose the last element of your data though, nor what's the extra dimention of Wzr2D for

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Resizing and Reshaping Matrices 的更多信息

标签

产品


版本

R2020a

Community Treasure Hunt

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

Start Hunting!

Translated by