Could anyone tell me the efficient way to do this? Extracting values from an array for a single condition (say all values greater than 'x') using 'where' and 'compress' is simple enough.
from Numeric import arange,where,compress data= arange(10) data= [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] mask= where((data > 3),1,0) result= compress(mask,data) result
array([4, 5, 6, 7, 8, 9])
But, 'where' doesn't appear to allow for multiple conditions in one statement. For instance, I'd like to do something like:
mask= where((3 < data <= 7),1,0)
but, this won't work.
Right. "3 < data" creates an array of 0s and 1s where the condition is false and true, respectively. You don't need where() at all.
Try
mask = logical_and(3 < data, data <= 7)
-- Robert Kern [EMAIL PROTECTED]
"In the fields of hell where the grass grows high Are the graves of dreams allowed to die." -- Richard Harter -- http://mail.python.org/mailman/listinfo/python-list
