MATLAB: A(B)=0 What is its meaning

a(b)=0MATLAB

A=rand(5)

B=A>0.8

A(B)=0

Can you tell me what is A(B)=0 meaning?

Best Answer

B is a logical index matrix. You can see the value is 1 (true) or 0 (false) wherever the corresponding value in A is greater than 0.8.

A(B)=0 means for all those places where B's value is true, set the corresponding value in A to 0.

Use this example to see it better.

A=magic(5)
B=A>10
A(B)=0

Related Solutions

MATLAB: What does a = b > c specify in MATLAB syntax

Yes, you can replace it with

if b > c
 a = logical(1);
else
 a = logical(0);
end

Another way of expressing this is:

if b > c
 a = true;
else
 a = false;
end

This is not the same as

if b > c
 a = 1;
else
 a = 0;
end

because in this later code, a = 1 or a = 0 assigns values of class double() to a, which behaves differently than when values of class logical() are assigned to a .

MATLAB: Index exceeds array bound meaning

It means that the index number is more than the array elements.

An example:

x=[1:10]
x(11)

Your array has 10 elements but you try accessing the 11th element.

Best Answer

Related Solutions

MATLAB: What does a = b > c specify in MATLAB syntax

MATLAB: Index exceeds array bound meaning

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