How to take a difference within the data of the same city but not across the city, Part 3

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alpedhuez 2020-12-8

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评论： alpedhuez 2020-12-8

I have a table

City Date Cumulative_Visitors
-----------------------
NY January 1 100
NY January 2  150
NY January 3  200
SF January 1 70
SF January 2 200
SF January 3 400

I explained the problem of calculating the new_visitors.

If I just use "diff", then, it will create a problem at the first entry of each city.

Then the idea is

run diff
then replace the first entry of each city with the cumulative_visitor of that day

How can one write "replace the first entry of each city with the cumulative_visitor of that day"?

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John D'Errico 2020-12-8

STOP ASKING THE SAME QUESTOIN REPEATEDLY. While you claim this is different, it is the same thing you asked before.

alpedhuez 2020-12-8

This is a "different way of solving the same question" that can be applied to other problems. Thus not redundant.

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Answer 1

Ameer Hamza 2020-12-8

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https://ww2.mathworks.cn/matlabcentral/answers/686933-how-to-take-a-difference-within-the-data-of-the-same-city-but-not-across-the-city-part-3#answer_568923

Same answer as this: https://www.mathworks.com/matlabcentral/answers/685423-how-to-take-a-difference-within-the-data-of-the-same-city-but-not-across-the-city

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How to take a difference within the data of the same city but not across the city, Part 3

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