How would I write this code?

Question

Amanda Viken 2021-10-13

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1563096-how-would-i-write-this-code

回答： Cris LaPierre 2021-10-13

I have data like this:

Fourth column is time in UTC/Zulu and the fifth column is stage observations.

1	2015	0	3.48
1	2015	6	3.48
1	2015	12	3.46
1	2015	18	3.43
2	2015	0	3.39
2	2015	6	3.33
2	2015	12	3.27
2	2015	18	3.21

I am trying to use the find function to index the data correctly.

This is what I have so far but I keep getting errors.

ind = find((obs(:,1)== month) & (obs(:,2) == day) & (obs(:,3) == year) & (obs(:,4) == time));

These are the errors that continue to pop up.

>> COMO2_2015
Error using month (line 44)
Please enter D.
Error in COMO2_2015 (line 5)
ind = find((obs(:,1)== month) & (obs(:,2) == day) & (obs(:,3) == year) &
(obs(:,4) == time));

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Answer 1

Cris LaPierre 2021-10-13

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1563096-how-would-i-write-this-code#answer_808086

What is month?

You are using it as a variable. However, if you have not defined it as a variable, then MATLAB is trying to call the month function. However, doing so without inputs will result in this error.

t = datetime('now')
t = datetime
   13-Oct-2021 21:09:06
month(t)
ans = 10
% the error you are seeing due to calling the function without inputs
month
Error using month (line 44)
Please enter D.