How to look up corresponding 2D matrix from a table of 8 columns?

Question

Yun Inn 2012-7-23

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/44289-how-to-look-up-corresponding-2d-matrix-from-a-table-of-8-columns

I have 8 columns corresponding to thickness 0,5,10,15,20,25,30,35cm. Each column/thickness consist of one 2D matrix.

Columns 1 through 5
      [1024x1024 double]    [1024x1024 double]    [1024x1024 double]    [1024x1024 double]    [1024x1024 double]
    Columns 6 through 8
      [1024x1024 double]    [1024x1024 double]    [1024x1024 double]

How do I get a corresponding 2D matrix for a known thickness, e.g.7cm?

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

Titus Edelhofer 2012-7-23

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/44289-how-to-look-up-corresponding-2d-matrix-from-a-table-of-8-columns#answer_54303

在 MATLAB Online 中打开

Hi,

in this case probably this is easiest done by hand:

columns = 0:5:35;
thick = 7;
% find the 2 indices where 7 falls in between:
idx = find(columns<=thick, 1, 'last');
fraction = (thick-columns(idx)) / (columns(idx+1)-columns(idx));
% the interpolation matrix is the left one + a fraction of the difference:
matrix = allMatrices{idx} + fraction * (allMatrices{idx+1}-allMatrices{idx});

Note, you need to handle the cases thick<0 and thick>=35 with care.

Titus

2 个评论
显示无隐藏无

Yun Inn 2012-7-23

Hi Titus

What do I do if thick is also a 2D matrix?

Titus Edelhofer 2012-7-23

Hmm, with the original question/answer you get the 2D interpolation matrix for one thickness. If thick is a 2D matrix (say NxM), and you loop, you will get N*M interpolation matrices of size 1024x1024. If N and M are not too large, this is no problem.

请先登录，再进行评论。