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Count number of elements in a matrix more or less than given numbers

Asked by Meg Cullen on 16 May 2019
Latest activity Answered by Sulaymon Eshkabilov on 16 May 2019
I want to count number of elements in the 2nd column of a matrix more or less than given numbers x and y.
For example, In the matrix A, x=20 and y=10.Thus the count of numbers >20 and <10 (i.e not between 10 to 20) is 5
A =
1 23
2 9
3 55
4 78
5 16
6 11
7 1
How to construct this code?

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2 Answers

Answer by Kevin Phung on 16 May 2019
Edited by Kevin Phung on 16 May 2019
 Accepted Answer

x = 10;
y = 20;
sum(A(:,2)<x | A(:,2)>y)

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Answer by Sulaymon Eshkabilov on 16 May 2019

Hi Meg,
Here are two simple solutions to your problem:
% Given matrix:
A =[ 1 23;
2 9;
3 55;
4 78;
5 16;
6 11;
7 1];
%% 1- way
Anew = A(:,2);
Index1 = find(Anew<10); Index2 = find(Anew>20);
Number1 = numel(Index1)+numel(Index2);
%% 2- way
Number2 = numel(find(A(:,2)<10))+numel(find(A(:,2)>20));
Good luck.

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