how many elements lie between 20 and 30

Hello everyone can you please help in finding. How many elements lie between 20 and 30 ?

I want to know the command ?

Answer 1

[Image Analyst]

What form are your numbers in? A vector y? Maybe this:

logicalIndexes = y > 20 & y < 30;
firstElement = find(logicalIndexes, 1, 'first');
lastElement = find(logicalIndexes, 1, 'last');
numberOfElements = lastElement  - firstElement + 1;

but it really depends on what your data is doing and what you're after. That's just one possible interpretation. Please clarify by giving an example.