Matlab中的逻辑掩码 [英] Logical mask in Matlab

问题描述

我正在尝试使用逻辑数组掩码对这个数组的所有值进行平方a = [1:1:2000}.逻辑阵列掩码定义为b = a< 500. 我该如何使用遮罩对这些值求平方?

I am trying to use a logical array mask to square all the values of this array a = [1:1:2000}. The logical array mask is defined as b = a <500. How would I square those values using the mask?

推荐答案

a = 1:2000; %# 1 by 2000 double
b = a<500;  %# 1 by 2000 logical    
a_squared     = a(b).^2; %# 1 by 499 double
%# logical index--^ ^-- 'dot' means element-wise operation

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