在Matlab向量或矩阵的特定位置插入值 [英] Insert value at a specific spot in matlab vector or matrix

问题描述

我试图在另一个向量中指定的特定索引处向向量插入一个值，然后相应地替换其他值.

I'm trying to insert a value to a vector at specific indices, specified in another vector, and then displacing the other values accordingly.

例如

Vector=[1 2 3 4 5] %vector of data
Idx=[2 4] %Indices at which to insert a value

Value to insert is X

NewVector=[1 X 2 X 3 4 5]

是否有一些简单的方法可以做到这一点，最好避免循环?

Is there some straightforward way to do that, preferably avoiding a loop?

推荐答案

Vector=1:5;  
Idx=[2 4];
c=false(1,length(Vector)+length(Idx));
c(Idx)=true;
result=nan(size(c));
result(~c)=Vector;
result(c)=42

result =

     1    42     2    42     3     4     5

如果要在已删除的注释中插入新值，请执行以下操作:

If you wanted the new values inserted as in your deleted comment, do this:

 c(Idx+(0:length(Idx)-1))=true;

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