store data in matrix

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

[Azzi Abdelmalek]

How are you getting these data? how are they captured? are you using a Daq or just a code?

Answer 1

[Thorsten]

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;