How do I create a row vector P, that contains the sum of the values in column 2 and the sum of the values in column 5 of matrix B.

Given: B=rand(randi([10 20]),randi([5 30]))

Find: Create a row vector P, that contains the sum of the values in column 2 and the sum of the values in column 5 of matrix B.

Issue: I am unfamiliar with the wording, or how to contain the two sums in one variable using code. Variable P must be of size [1 2].

My Solution: I got as far as to state >>P=sum(B(:,2); but I do not know how to get the required parameters.

Answer 1

[VBBV]

B = rand(randi([10,20]),randi([5,30]))

B = 14x8

0.3610 0.2474 0.3160 0.1435 0.1535 0.3404 0.2446 0.2655 0.4167 0.9502 0.6448 0.7184 0.4979 0.9226 0.3517 0.7340 0.3727 0.5187 0.7976 0.0949 0.1334 0.4733 0.0156 0.9237 0.1379 0.4606 0.3640 0.2959 0.1628 0.0785 0.9126 0.5805 0.3026 0.0816 0.7866 0.7748 0.3589 0.4130 0.5204 0.7442 0.1768 0.3753 0.5468 0.7770 0.7853 0.1499 0.1178 0.6284 0.3736 0.8786 0.3791 0.8693 0.1866 0.7627 0.0871 0.4819 0.6952 0.9907 0.6566 0.2390 0.9916 0.5976 0.4159 0.1089 0.2989 0.7671 0.0724 0.0051 0.5487 0.5736 0.0606 0.3279 0.5183 0.3728 0.7747 0.3285 0.4035 0.6180 0.1434 0.6018

P = sum(B(:,[2,5]))

P = 1x2

8.2966 5.1808

[Spaceman]

Eureka! I can't believe the answer is this simple. I forgot how to create a subset for the columns. Thank you!