如何最快地從數組中刪除整行/列？

Question

例如我想將360x160陣列變成360x159陣列。

Answer 1

只能選擇行你需要：

a = ones(360,160); 
b = a(:,1:159); 
size(b) 
ans = 

    360 159 

Answer 2

最快的方法是刪除列，如@jucestain建議。如果您想保留原始數組，請複製它並從副本中刪除。 @ Molly的解決方案稍微慢一點。

>> tic; a=ones(360,160); a(:,160)=[]; toc 
Elapsed time is 0.001409 seconds. 
>> tic; a=ones(360,160); b=a; b(:,160)=[]; toc 
Elapsed time is 0.001827 seconds. 
>> tic; a=ones(360,160); b=a(:,1:159); toc 
Elapsed time is 0.004002 seconds.