[R] Help massaging big arrays

Philip Rhoades pri at chu.com.au
Thu Aug 1 16:38:24 CEST 2002

Hi all,

I hope someone can give me some quick pointers - it would take me ages 
to work this out from scratch - I want to:

- From an array - 32 cols x 1000 rows of small floats

- Produce a second array from the first where the all numbers have an 
abs fn applied to them (to get rid of the neg numbers)

- Produce a third array from the second where all numbers less than 
0.0005 are converted to 0.0005

- Produce a fourth array (5x1000) from the third where the first number 
in the row is the mean of the first two numbers of array #3, the second 
number is the mean of the first 4 numbers, 3rd mean of 8, 4th mean of 
16, 5th mean of 32

- Produce a fifth (5x1000) array by dividing array #4 into another 
5x1000 array

- Produce 5 means of the 5 columns of array #5

Any help greatly appreciated.


Philip Rhoades

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GPO Box 3411
Sydney NSW	2001
Mobile:  +61:0411-185-652
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E-mail:  pri at chu.com.au
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