Need some help setting up a function for elementary data filtering

2011 7 26
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Hi,
I have imported a data array (Araw) that has a couple thousand rows and 17 columns (50Hz data - each column represents a monitored variable). These are the tasks I am required to perform with Matlab:
  • Absolute value all values in column 7
  • Remove all rows of data where values in column 8 are >=0
  • Absolute value all remaining values in column 8
  • Rename the new array "A"
I'm relatively new at programming with Matlab so any help/hints/tips are most appreciated.
Many thanks,
Riccardo

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Honglei Chen
Honglei Chen 2011-7-26

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You can use logical index to do this. For example, to achieve the first task, you can do something like
x = ones(5,4);
x(:,2) = abs(x(:,2))
You can also try the following code and see what happens
x = ones(5,4);
x(3,:) = []
HTH

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