Matlab条件赋值 [英] Matlab conditional assignment

问题描述

我正在寻找与c#condition ? true-expression : false-expression条件赋值等效的Matlab.我最了解的是a = 5>2，这是true \ false的赋值，
但是是否有任何一行条件分配 if condition a=1;else a=2; end?

I'm looking for Matlab equivalent of c# condition ? true-expression : false-expression conditional assignment. The most I know of is a = 5>2, which is true\false assignment,
but is there any one line conditional assignment for if condition a=1;else a=2; end?

推荐答案

一行条件赋值:

a(a > 5) = 2;

这是逻辑索引的一个示例，a > 5是大小与a相同且带有1的逻辑(即布尔或二进制)矩阵/数组，只要表达式为真.上面分配的左侧是a中a>5具有1的所有位置.

This is an example of logical indexing, a > 5 is a logical (i.e. Boolean or binary) matrix/array the same size as a with a 1 where ever the expression was true. The left side of the above assignment refers to all the positions in a where a>5 has a 1.

b = a > 5; % if a = [9,3,5,6], b = [1,0,0,1]
a(~b) = 3;
c = a > 10;
a(b&c) = ...

等等...使用这种逻辑数组，您几乎可以做任何您期望的事情.

Etc...you can do pretty much anything you'd expect with such logical arrays.

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