Latest Contributions by DanPatterson_Retired

To demonstrate how to combine the lists (which may be of different lengths) see the following example: aList = ["a", "c", "e", "g"] bList = ["b", "d", "f", "h", "i", "j"] n1 = len(aList) n2 = len(bList) combo = [] for i in range(0, n1):   combo += [aList, bList] if n2 > n1:   combo += bList[n1:n2] print combo Ensure that aList is the shorter of the two and bList is equal to or greater than aList. ... View more

Sharynh http://forums.arcgis.com/threads/27483-module-object-has-no-attribute-GetParamaterAsText spelling issues is the source of your problem ... View more

I am assuming that you are using the spatial analyst extension, if so, see the first example in this link http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009z00000005000000.htm ... View more

Sounds like a symbology issue, don't let the visual be your guide, you can always change it.   To see if there are real differences, subtract both grids and check for numerical differences.  Also ensure that you are using the same environment settings (ie cell size and extent) when running both ... View more

No problem Karl I also wanted to point out that the line (end-start)/60.0 ) ensures that integer division doesn't occur.  Consider the following code snippet which demonstrates the importance of ensuring that at least one of the inputs is a floating point number when performing division IF you want a floating point result. >>> start = 0 >>> end = 10 >>> result = (end - start) / 60 >>> print result 0 >>> result_good = (end - start) / 60.0 >>> print result_good 0.166666666667 >>> ... View more

gp.AddMessage("Processing time:", (end-start)/60, "minutes") this line is wrong since it read gp.AddMessage("Processing time:" + str( (end-start)/60.0 ) + " minutes") the reason that you didn't get an error in Pythonwin is because, it simply ignored it...there may be other errors but remember print "a", "b", "c" needs to be translate to gp.AddMessage("a" + "b" + "c") until ESRI makes AddMessage more Pythonic ... View more

I suspect it depends upon the element that you wish to change, for example, the sample code in the help file found here: http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00s30000000m000000.htm contains lines of code...     if elm.text == "2009":         elm.text = "2010" which suggests that you could simply change it to something like this     if elm.text == "2009":         elm.text = "" essentially "removing" it ... View more

and to add to that path list, it looks in the path where the main script resides, which makes it useful and easier to distribute scripts and toolboxes as one grouping in one folder ... View more

Here is a sample program that imports a user module which contains functions ''' Main_program.py demonstrates how to import and call functions from another module ''' import CallingFunctions a_list = [1,2,3,4,5,6,7,8,9,10] print CallingFunctions.func1(a_list) print CallingFunctions.func5(a_list) print CallingFunctions.func8(a_list) The module that is imported is here ''' Callingfunctions.py imported into another program giving it access to the functions ''' def func1(inputs=None):   x = sum(inputs)   return "sum some numbers: ", x ''' more functions ''' def func5(inputs=None):   x_sq = 0   for x in inputs:     x_sq += x**2   return "sum of squares: ", x_sq ''' more functions ''' def func8(inputs=None):   return "hello from 8: ", inputs ''' more functions ''' if __name__ == "__main__":   a_list = [1,2,3,4,5,6,7,8,9,10]   inputs = "test inputs"   a_dict = {1:[func1([1,2,3]) ],             5:[func5([1,2,3])],             8:[func8("inputs to 8")]}   needed = [1,5,8]   for akey in needed:     if akey in a_list:       action = a_dict[akey]       print "\naction: ", action if the two *.py files are located within the same directory, you can import the CallingFunctions module and use its functions from the Main_program.  In this manner you can create "helper" modules that can be used by other programs.  you should also note, that for testing purposes, the CallingFunctions can be run in standalone mode with the addition of the code block denoted by the "if" statement towards the end ... View more

You are encountering integer division (read all about it).  To overcome this you need to cast one of the two grids to its floating point representation.  In version 10, this would be accomplished by using "float" either the tool or within the raster calculator. ... View more

Did you rule out subtracting one from the other? Look for subtract or minus within the spatial analyst for your version, for example, in V10 http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009z00000093000000.htm ... View more

this is the only bug associated with it http://resources.arcgis.com/content/nimbus-bug?bugID=TklNMDU5OTcy try another dataset and see if it works if you are sure that both files have the same coordinate system (hopefully you didn't use Define Projection at any step of the process...you could have defined one or more wrong) ... View more

are both files in the same coordinate system?  don't rely on the view of the data since projection on the fly make things look nice, but they aren't ... View more

did you rule out adding appropriate X and Y fields (decimal etc) and use the Calculate Geometry option in the table? ... View more