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Extract certain values in .mat file

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Sleiman Ghorayeb
Sleiman Ghorayeb 2024-4-24
编辑： VBBV 2024-4-24
Hi,
I have a mat file with 1250x1 data and I want to extract specific values from the 1250. For example I want to extract every 2nd or every 5th values.
As an example, the mat file contains the following values:
-0.13793 -0.114746 -0.204773 -0.224304 -0.181274 -0.192566 -0.159912 -0.174866 -0.134888 -0.148926
For every 2nd I want to read: -0.114746 -0.224304 -0.192566 -0.174866 -0.148926
For every 5th I want to read: -0.181274 -0.148926
What is the best command to do this? Thank you.
  1 个评论
VBBV
VBBV 2024-4-24
@Sleiman Ghorayeb To extract you need to first load the mat file into workspace and access the data variable

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回答（1 个）

VBBV
VBBV 2024-4-24
Ran in:
data= [-0.13793 -0.114746 -0.204773 -0.224304 -0.181274 -0.192566 -0.159912 -0.174866 -0.134888 -0.148926]
data = 1x10
-0.1379 -0.1147 -0.2048 -0.2243 -0.1813 -0.1926 -0.1599 -0.1749 -0.1349 -0.1489
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
data(2:2:end)
ans = 1x5
-0.1147 -0.2243 -0.1926 -0.1749 -0.1489
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
data(5:5:end)
ans = 1x2
-0.1813 -0.1489
<mw-icon class=""></mw-icon>
<mw-icon class=""></mw-icon>
  2 个评论
Sleiman Ghorayeb
Sleiman Ghorayeb 2024-4-24
Thank you for your response. Very helpful.
However, I read the original data file by using the "load" command.
Can I do this:
data=[hb]; %hb is the array containing all 1250 data points
data(2:2:end);
or
data(5:5:end);
VBBV
VBBV 2024-4-24
编辑：VBBV 2024-4-24
@Sleiman Ghorayeb yes, you can if the datatype of hb is not a structure. It its a structure, then you need to use . (dot) operator to access data from structure. can you attach data file ?

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