从 Octave 中的 CSV 文件中读取日期

Question

I want to read a CSV file in Octave which has a date column and 4 columns which are integers. I have used.

[num,txt,raw] = dlmread('Mitteilungen_data.csv');
ID = num(:,1) ;
DATE = datestr (date, yyyy-mm-dd) ;
FK_OBSERVERS= num(:,2) ;
GROUPS = num(:,3) ;
SUNSPOTS = num(:,4) ;
WOLF = num(:,5) ;
dn=datenum(DATE,'YYYY-MM-DD');
plot(dn,WOLF)

Sample Data:

 ID DATE FK_OBSERVERS GROUPS SUNSPOTS WOLF 4939 1612-01-17 11 5 11 61 83855 1612-01-18 85 2 2 22 4940 1612-01-20 11 4 5 45 4941 1612-01-21 11 4 7 47 4942 1612-01-23 11 3 5 35 4943 1612-01-24 11 3 6 36 4944 1612-01-25 11 6 13 73 4945 1612-01-27 11 3 6 36 83856 1612-01-28 85 NULL NULL NULL 4946 1612-01-29 11 3 6 36 4947 1612-01-30 11 4 8 48 4948 1612-02-02 11 5 8 58 4949 1612-02-05 11 4 7 47 4950 1612-02-06 11 3 7 37 4951 1612-02-10 11 5 7 57 4952 1612-02-12 11 3 4 34 4953 1612-02-13 11 2 2 22 4954 1612-02-14 11 3 3 33

The Date column is showing an error: element number 2 undefined in return list . How can I fix this?

Answer 1

You are using

[num, txt, raw] = dlmread( %...

but dlmread does not return three outputs. Type help dlmread in your console to see the syntax.

What does seem to return these three arguments is the xlsread command. Perhaps you copied code that used xlsread?

However, even so, I would still use csv2cell . Type csv2cell('data.csv') (where data.csv is the name of your file) to see what kind of output it gives

Before you can use any of the commands defined in the io package, you need to load it on your workspace.

pkg load io