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.

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Spaceman
Spaceman 2024-2-19
评论： Spaceman 2024-2-19
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.

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采纳的回答

VBBV
VBBV 2024-2-19
Ran in:
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

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