How to get values ​​from multiple columns based on the values ​​of one column ?

8 次查看（过去 30 天）
elliot brooksbank
elliot brooksbank 2021-8-19
编辑： Adam Danz 2021-8-27
i have an 85x3 double dataset made up of months, years and timestamps. i want to extract the values from all 3 columns based on month e.g december/12 then create a new variable with just the selected data in the columns that correspond with 12 for years 2007-2014
  1 个评论
Adam Danz
Adam Danz 2021-8-19
Since you described the data as double precision, your timestamps must be numeric instead of datetime. Any reason for that? Datatime values are usually more easy to work with. How are you timestamps represented as numeric values?

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Adam Danz
Adam Danz 2021-8-19
编辑：Adam Danz 2021-8-27
Ran in:
This is how I imagine your data are organized based on your description.
% [year, month, data, ...]
data = [repelem((2007:2014)',12,1), repmat((1:12)',8,1), rand(96,5)]
data = 96×7
1.0e+03 * 2.0070 0.0010 0.0010 0.0001 0.0004 0.0008 0.0002 2.0070 0.0020 0.0001 0.0006 0.0003 0.0004 0.0008 2.0070 0.0030 0.0000 0.0002 0.0003 0.0000 0.0001 2.0070 0.0040 0.0002 0.0005 0.0003 0.0003 0.0002 2.0070 0.0050 0.0008 0.0009 0.0003 0.0010 0.0003 2.0070 0.0060 0.0003 0.0007 0.0010 0.0008 0.0005 2.0070 0.0070 0.0005 0.0003 0.0009 0.0009 0.0007 2.0070 0.0080 0.0005 0.0006 0.0004 0.0002 0.0006 2.0070 0.0090 0.0007 0.0009 0.0001 0.0007 0.0010 2.0070 0.0100 0.0002 0.0001 0.0004 0.0001 0.0000
Get all values from column 3 and month 12 with months in column 2 of the data.
% v-months v-column 3
vals = data(data(:,2)==12, 3)
vals = 8×1
0.3673 0.0875 0.5953 0.4585 0.6260 0.8043 0.1210 0.4608

类别

在 Help Center 和 File Exchange 中查找有关 Logical 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by