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

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)?

Answer 1

[Daniel M]

sum(x(151:end) == 1)

Answer 2

[Ameer Hamza]

Try this.

x = randi([1 10], 1, 600000); % random vector
result = sum(x(151:end)==1);

[Caesar Hernandez]

This also worked.

Answer 3

[per isakson]

If x is a vector of whole numbers

sum( double( x(151:end)==1 ) )

else

sum( double( abs(x(151:end)-1) < small_number ) )

[Caesar Hernandez]

The top line also worked. The bottom line did not.

[per isakson]

It works here. Did it return any error message?