CODEWITHSUNDEEP
matlab
someDude
someDude

Reputation: 63

Logical mask in Matlab

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?

Upvotes: 4

Views: 5176

Answers (3)

Serg
Serg

Reputation: 14098

Another one, more tricky. Here we apply logical mask to the power, which gets values 1 or 2.

a_sq = a .^ (2 - (a >= 500));

Upvotes: 1

Serg
Serg

Reputation: 14098

If you need the result to be the same size as a (keeping a >= 500 values as is), then:

a_sq = (a .^ 2) .* (a < 500) + a .* (a >= 500);

Upvotes: 2

tmpearce
tmpearce

Reputation: 12683

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

Upvotes: 8

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