The summation of elements between two numbers

We have made a matrix with 7 rows and 18 columns with random elements between 10-100. From these we have solved that there are 21 elements with a value between 35 and 55.

Now we have to calculate the summation of these 21 elements. How do we do that?

Answer 1

[David Hill]

yourMatrix=rand(7,18)*90+10;
s=sum(yourMatrix(yourMatrix>=35&yourMatrix<=55))

s = 1.3268e+03