I have a long list of floats (1613808 elements long). It takes quite a
while to load this into a 7 dimensional Numeric array.
Is there any obvious way to speed this up?
def insertData(self ,data):
# Start off with an array of the desired size
# "self.MEASURED" , etc., are integers
arrayData = zeros([self.MEASURED, self.SWEPT, \
self.TEMPS,self .DCS, self.IVS, self.UUTS, \
self.DUTS], Float64)
i = 0
for device in range(self.DUTS ):
for unit in range(self.UUTS ):
for iv in range(self.IVS) :
for dc in range(self.DCS) :
for temp in range(self.TEMP S):
for swept in range(self.SWEP T):
for measured in range(self.MEAS URED):
arrayData[measured][swept][temp][dc][iv][unit][device] = bigList[i]
i += 1
return arrayData
Stephen 3 1818
Stephen Boulet wrote: I have a long list of floats (1613808 elements long). It takes quite a while to load this into a 7 dimensional Numeric array.
Is there any obvious way to speed this up?
Perhaps reshape will be able to solve this problem for you. I hear it
is very fast.
- Josiah
"Stephen Boulet" <stephendotboul et@motorola_._c om> wrote in message
news:bv******** **@newshost.mot .com... I have a long list of floats (1613808 elements long). It takes quite a while to load this into a 7 dimensional Numeric array.
Is there any obvious way to speed this up?
def insertData(self ,data):
# Start off with an array of the desired size # "self.MEASURED" , etc., are integers arrayData = zeros([self.MEASURED, self.SWEPT, \ self.TEMPS,self .DCS, self.IVS, self.UUTS, \ self.DUTS], Float64)
i = 0
for device in range(self.DUTS ): for unit in range(self.UUTS ): for iv in range(self.IVS) : for dc in range(self.DCS) : for temp in range(self.TEMP S): for swept in range(self.SWEP T): for measured in range(self.MEAS URED):
arrayData[measured][swept][temp][dc][iv][unit][device] = bigList[i] i += 1 return arrayData
Stephen
Creating a 1-dimensional array, then reshaping it is (I guess) as quick as
anything. Something like, import Numeric an_array = Numeric.array(r ange(24)) shape = [2, 3, 4] an_array = Numeric.reshape (an_array, shape) an_array
array([[[ 0, 1, 2, 3],
[ 4, 5, 6, 7],
[ 8, 9, 10, 11]],
[[12, 13, 14, 15],
[16, 17, 18, 19],
[20, 21, 22, 23]]])
To respond to my own post, after a bit of digging, there is a much
faster way.
Coerce my list to a numarray:
bigList = inputarray(bigL ist,Float64)
Then just change its shape:
dims = [self.DUTS,self. UUTS,..,self.ME ASURED]
dims.reverse()
dims = tuple(dims)
bigList.setshap e(dims)
Stephen Boulet wrote: I have a long list of floats (1613808 elements long). It takes quite a while to load this into a 7 dimensional Numeric array.
Is there any obvious way to speed this up?
def insertData(self ,data):
# Start off with an array of the desired size # "self.MEASURED" , etc., are integers arrayData = zeros([self.MEASURED, self.SWEPT, \ self.TEMPS,self .DCS, self.IVS, self.UUTS, \ self.DUTS], Float64)
i = 0
for device in range(self.DUTS ): for unit in range(self.UUTS ): for iv in range(self.IVS) : for dc in range(self.DCS) : for temp in range(self.TEMP S): for swept in range(self.SWEP T): for measured in range(self.MEAS URED):
arrayData[measured][swept][temp][dc][iv][unit][device] = bigList[i] i += 1 return arrayData
Stephen This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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