How can I count the number of times a specific value appears within a range in a 1D vector?

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Caesar Hernandez
Caesar Hernandez 2020-4-27
评论： per isakson 2020-4-29
Given a 1D vector, x, that has 600000 elements, how can I count the number of times the value 1 appears after the 150th position (excluding 150)?

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Daniel M
Daniel M 2020-4-27
sum(x(151:end) == 1)

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Ameer Hamza
Ameer Hamza 2020-4-27
编辑：Ameer Hamza 2020-4-27
Try this.
x = randi([1 10], 1, 600000); % random vector
result = sum(x(151:end)==1);
per isakson
per isakson 2020-4-27
If x is a vector of whole numbers
sum( double( x(151:end)==1 ) )
else
sum( double( abs(x(151:end)-1) < small_number ) )

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