store data in matrix
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Hi everyone,
i am getting data every second that looks like this:
a =
Columns 1 through 8
223.5700 -0.0300 -0.0700 50.7000 1.0310 -0.1600 -0.1900 76.1000
Column 9
1.0420
this will go on for approximately 6 -7 hours. Now i want to store this in a matrix (so it grows), so after 3 second I have a matrix of 3 x 9. Unfortunately I am having difficulty realizing it.
could you help me out?
Many thanks
Paul
1 Comment
Azzi Abdelmalek
on 8 Jul 2015
Edited: Azzi Abdelmalek
on 8 Jul 2015
How are you getting these data? how are they captured? are you using a Daq or just a code?
Answers (1)
Thorsten
on 8 Jul 2015
Growing matrices slow down your program, so preallocate M:
Nhours = 7;
M = ones(Nhours*3600, 9);
Have a look at it's size
whos M
Name Size Bytes Class Attributes
M 25200x9 1814400 double
1.8 MB, seems ok.
Now create an index for the row and increment i every second when you add a new value to M
i = 1;
% start you loop to get data
M(i,:) = currrentdata;
i = i + 1;
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