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 2024-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/2084113-how-do-i-create-a-row-vector-p-that-contains-the-sum-of-the-values-in-column-2-and-the-sum-of-the-v

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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Answer 1

VBBV 2024-2-19

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https://ww2.mathworks.cn/matlabcentral/answers/2084113-how-do-i-create-a-row-vector-p-that-contains-the-sum-of-the-values-in-column-2-and-the-sum-of-the-v#answer_1412128

在 MATLAB Online 中打开

B = rand(randi([10,20]),randi([5,30]))
B = 14x8
3610    0.2474    0.3160    0.1435    0.1535    0.3404    0.2446    0.2655
4167    0.9502    0.6448    0.7184    0.4979    0.9226    0.3517    0.7340
3727    0.5187    0.7976    0.0949    0.1334    0.4733    0.0156    0.9237
1379    0.4606    0.3640    0.2959    0.1628    0.0785    0.9126    0.5805
3026    0.0816    0.7866    0.7748    0.3589    0.4130    0.5204    0.7442
1768    0.3753    0.5468    0.7770    0.7853    0.1499    0.1178    0.6284
3736    0.8786    0.3791    0.8693    0.1866    0.7627    0.0871    0.4819
6952    0.9907    0.6566    0.2390    0.9916    0.5976    0.4159    0.1089
2989    0.7671    0.0724    0.0051    0.5487    0.5736    0.0606    0.3279
5183    0.3728    0.7747    0.3285    0.4035    0.6180    0.1434    0.6018
P = sum(B(:,[2,5]))
P = 1x2
2966    5.1808