矩陣內的插值。 Matlab的

Question

我有一個矩陣的樣子：

0 0 0 0 0 
    1 0 0 0 0 
    0 2 0 0 0 
    0 0 2 0 0 
    0 0 0 1 0 
    1 0 0 0 1 
    0 4 0 0 0 
    0 0 3 0 0 
    6 0 0 4 0 
    0 3 0 0 2 
    0 0 5 0 0 

這是11x5矩陣。 我想爲每列垂直插值。

任何幫助？

謝謝。

Answer 1

M =[0 0 0 0 0 
    1 0 0 0 0 
    0 2 0 0 0 
    0 0 2 0 0 
    0 0 0 1 0 
    1 0 0 0 1 
    0 4 0 0 0 
    0 0 3 0 0 
    6 0 0 4 0 
    0 3 0 0 2 
    0 0 5 0 0]; 

xi = 1:size(M,1) 
for colIdx = 1:size(M,2) 
    col = M(:,colIdx); 
    x = xi(~~col); %// Note that ~~col is a logical vector of elements that are not equal to zero. i.e. it's the same as col ~= 0 
    y = col(~~col); 
    M(:,colIdx) = interp1(x,y,xi); 
end 

然後如果你想外點是0在循環後添加此行：

M(isnan(M)) = 0;