How do I subtract from specific elements in a vector?

Question

Jennifer Coss 2017-3-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/328672-how-do-i-subtract-from-specific-elements-in-a-vector

编辑： Rahul Kalampattel 2017-3-8

I'm supposed to be able to calculate the total cost of movie tickets, with a discount program. The program says that if there are more than 5 customers of a type (child, adult, senior, student) one person of the type gets in free. I think I'm really close to solving it, but I'm stuck at the last little part.

function [income cnt] = tickets( price, numTickets )

if(numTickets>5)

numTickets = (numTickets>5)-1;

end

income = price.*numTickets;

income = sum(income);

cnt = sum(numTickets);

end

So I added everything up myself (using [totalIncome totalCount]= tickets([3 10 6 5], [1 6 1 2])) and got 69 for the final price, but Matlab gave me 79.

Thanks for any help!

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Answer 1

Rahul Kalampattel 2017-3-8

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/328672-how-do-i-subtract-from-specific-elements-in-a-vector#answer_257787

编辑：Rahul Kalampattel 2017-3-8

在 MATLAB Online 中打开

function [income cnt] = tickets( price, numTickets )
cnt = sum(numTickets);
numTickets = numTickets - (numTickets>5);
income = sum(price.*numTickets);
end

If numTickets = [1 6 1 2], then (numTickets>5) == [0 1 0 0]. Subtract this from the original input, and you get the correct number of people to calculate the income with.