how to find index of the point in matrix with condition?

Let's say, i have matrix 6-by-1 matrix:

A=[ 1         --->labelling "1"   
    6         --->labelling "2" 
    3         --->labelling "3"
    5         --->labelling "4"
   -3         --->labelling "5"
   10 ]       --->labelling "6"

 and 

 B=[5]

I want to write the code to compare each value in matrix A with B with condition ( If {A}<B---> I will pick up the index and the value from matrix A to make a new matrix)

Particurly: I have the number 1,3, -3 (in matrix A) is smaller than 5 (in matrix B) so I will have the result after compare condition as follows:

C=[ 1         --->labelling "1"   
    3         --->labelling "3"
   -3 ]       --->labelling "5"

and the labelling matrix D will be :

D=[ 1           
    3          
    5 ]

How to write a relationship between matrix A,B,C,D ?

[KL]

Read the documentation. Your questions have direct and simple answers right there.

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

[Quincy Sproul]

yeh read the entire documentation for a single question.

Answer 1

[Benjamin Imbach]

check out the find function.

A = [1 6 3 5 -3 10]';
B = 5;
D = find(A<B); %(linear index)
C = A(D);

[Jan]

This is even more efficient with "logical indexing": omit the "find".

C = A(A < B)