Re: fromfile error on windows, not mac
One question : Did you remember to open the file in binary mode? This MUST be done on windows. On 22 jul 2008, at 06.36, jadamwil wrote: Hello, I am using the numpy fromfile function to read binary data from a file on disk. The problem is that the program runs fine on a Mac, but gives an error or warning on windows when trying to read the data. I use it like this: Signal = zeros((N, 16), dtype=float32) for sample in range(0, N): # this function gets the next position in the file to seek to s = getFilePos(sample) # go to the correct location in the file; this IS checked to make sure it is within the file mFile.seek(s) # read the 16 float32 values from the file D = fromfile(mFile, dtype=numpy.float32, 16) # save D in Signal Signal[sample, :] = D This will fail when sample is ~4. If I change the range to (5,N), skipping the bad file location, it will run fine for a few samples, and then give another error. The message it gives is: 16 items requested but only 7 read So D is a 7x1 vector, and the program dies when it tries to assign D to the slice of Signal (ValueError: shape mismatch: objects cannot be broadcast to a single shape). On windows, the Python version is 2.5.2, and the most recent numpy and scipy are being used as well. I tried using Enthought, but it gave this error as well, in addition to a c runtime error whenever I imported scipy (which is another post topic...). Any ideas on what might be causing this? Is there a way to debug the fromfile function? And, remember, this works perfectly on a Mac. Would compiling everything (python, scipy, numpy) potentially solve this? Thanks! -- http://mail.python.org/mailman/listinfo/python-list -- Skinheads are so tired of immigration, that they are going to move to a country that don't accept immigrants! Tommy Nordgren [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: fromfile error on windows, not mac
I found the problem: I thought it was opening in binary mode on BOTH windows and the mac, but on windows I passed rb with double quotes, not 'rb' with single quotes to the open file function. Changing it to 'rb' fixed it. On Jul 23, 8:25 am, Tommy Nordgren [EMAIL PROTECTED] wrote: One question : Did you remember to open the file in binary mode? This MUST be done on windows. On 22 jul 2008, at 06.36, jadamwil wrote: Hello, I am using the numpy fromfile function to read binary data from a file on disk. The problem is that the program runs fine on a Mac, but gives an error or warning on windows when trying to read the data. I use it like this: Signal = zeros((N, 16), dtype=float32) for sample in range(0, N): # this function gets the next position in the file to seek to s = getFilePos(sample) # go to the correct location in the file; this IS checked to make sure it is within the file mFile.seek(s) # read the 16 float32 values from the file D = fromfile(mFile, dtype=numpy.float32, 16) # save D in Signal Signal[sample, :] = D This will fail when sample is ~4. If I change the range to (5,N), skipping the bad file location, it will run fine for a few samples, and then give another error. The message it gives is: 16 items requested but only 7 read So D is a 7x1 vector, and the program dies when it tries to assign D to the slice of Signal (ValueError: shape mismatch: objects cannot be broadcast to a single shape). On windows, the Python version is 2.5.2, and the most recent numpy and scipy are being used as well. I tried using Enthought, but it gave this error as well, in addition to a c runtime error whenever I imported scipy (which is another post topic...). Any ideas on what might be causing this? Is there a way to debug the fromfile function? And, remember, this works perfectly on a Mac. Would compiling everything (python, scipy, numpy) potentially solve this? Thanks! -- http://mail.python.org/mailman/listinfo/python-list -- Skinheads are so tired of immigration, that they are going to move to a country that don't accept immigrants! Tommy Nordgren [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
Re: fromfile error on windows, not mac
On Wed, Jul 23, 2008 at 3:37 PM, jadamwil [EMAIL PROTECTED] wrote: I found the problem: I thought it was opening in binary mode on BOTH windows and the mac, but on windows I passed rb with double quotes, not 'rb' with single quotes to the open file function. Changing it to 'rb' fixed it. by the way, anyone could explain why changing to single quote makes a difference? rb == 'rb' True -- http://mail.python.org/mailman/listinfo/python-list
Re: fromfile error on windows, not mac
Manu Hack wrote: by the way, anyone could explain why changing to single quote makes a difference? rb == 'rb' True There's no difference between single quotes and double quotes in Python. My guess is cargo cult debugging. /F -- http://mail.python.org/mailman/listinfo/python-list
Re: fromfile error on windows, not mac
On Jul 23, 3:30 pm, Fredrik Lundh [EMAIL PROTECTED] wrote: Manu Hack wrote: by the way, anyone could explain why changing to single quote makes a difference? rb == 'rb' True There's no difference between single quotes and double quotes in Python. My guess is cargo cult debugging. /F Ha...you're probably not that far from the truth. I just started with python about a week ago, and have had a LOT of luck getting our lab's data analysis routines ported from matlab, with the exception of this problem. I tried a lot of different things to get it working on windows, and I think I got python quotes confused with matlab or php quotes (where double and single quotes are different), tried it, and it happened to work (although I probably changed something else as well in desperation). Of course, as many have pointed out, this does not actually matter in python. So anyway, yes, someone new to a language trying lots of different things without a full understanding of the language could probably be considered cargo cult programming :-). Thanks for the replies though! -- http://mail.python.org/mailman/listinfo/python-list
Re: fromfile error on windows, not mac
jadamwil schrieb: Hello, I am using the numpy fromfile function to read binary data from a file on disk. The problem is that the program runs fine on a Mac, but gives an error or warning on windows when trying to read the data. I use it like this: Signal = zeros((N, 16), dtype=float32) for sample in range(0, N): # this function gets the next position in the file to seek to s = getFilePos(sample) # go to the correct location in the file; this IS checked to make sure it is within the file mFile.seek(s) # read the 16 float32 values from the file D = fromfile(mFile, dtype=numpy.float32, 16) # save D in Signal Signal[sample, :] = D This will fail when sample is ~4. If I change the range to (5,N), skipping the bad file location, it will run fine for a few samples, and then give another error. The message it gives is: 16 items requested but only 7 read So D is a 7x1 vector, and the program dies when it tries to assign D to the slice of Signal (ValueError: shape mismatch: objects cannot be broadcast to a single shape). On windows, the Python version is 2.5.2, and the most recent numpy and scipy are being used as well. I tried using Enthought, but it gave this error as well, in addition to a c runtime error whenever I imported scipy (which is another post topic...). Any ideas on what might be causing this? Is there a way to debug the fromfile function? And, remember, this works perfectly on a Mac. Would compiling everything (python, scipy, numpy) potentially solve this? Did you open the file in binary mode ? Greetings, Uwe -- http://mail.python.org/mailman/listinfo/python-list
Re: fromfile error on windows, not mac
On Jul 22, 2:05 am, Uwe Schmitt [EMAIL PROTECTED] wrote: jadamwil schrieb: Hello, I am using the numpy fromfile function to read binary data from a file on disk. The problem is that the program runs fine on a Mac, but gives an error or warning on windows when trying to read the data. I use it like this: Signal = zeros((N, 16), dtype=float32) for sample in range(0, N): # this function gets the next position in the file to seek to s = getFilePos(sample) # go to the correct location in the file; this IS checked to make sure it is within the file mFile.seek(s) # read the 16 float32 values from the file D = fromfile(mFile, dtype=numpy.float32, 16) # save D in Signal Signal[sample, :] = D This will fail when sample is ~4. If I change the range to (5,N), skipping the bad file location, it will run fine for a few samples, and then give another error. The message it gives is: 16 items requested but only 7 read So D is a 7x1 vector, and the program dies when it tries to assign D to the slice of Signal (ValueError: shape mismatch: objects cannot be broadcast to a single shape). On windows, the Python version is 2.5.2, and the most recent numpy and scipy are being used as well. I tried using Enthought, but it gave this error as well, in addition to a c runtime error whenever I imported scipy (which is another post topic...). Any ideas on what might be causing this? Is there a way to debug the fromfile function? And, remember, this works perfectly on a Mac. Would compiling everything (python, scipy, numpy) potentially solve this? Did you open the file in binary mode ? Greetings, Uwe Yes I did. Would that make a difference between a mac and windows? Thanks -- http://mail.python.org/mailman/listinfo/python-list
Re: fromfile error on windows, not mac
On Jul 22, 8:35 am, jadamwil [EMAIL PROTECTED] wrote: On Jul 22, 2:05 am, Uwe Schmitt [EMAIL PROTECTED] wrote: jadamwil schrieb: Hello, I am using the numpy fromfile function to read binary data from a file on disk. The problem is that the program runs fine on a Mac, but gives an error or warning onwindowswhen trying to read the data. I use it like this: Signal = zeros((N, 16), dtype=float32) for sample in range(0, N): # this function gets the next position in the file to seek to s = getFilePos(sample) # go to the correct location in the file; this IS checked to make sure it is within the file mFile.seek(s) # read the 16 float32 values from the file D = fromfile(mFile, dtype=numpy.float32, 16) # save D in Signal Signal[sample, :] = D This will fail when sample is ~4. If I change the range to (5,N), skipping the bad file location, it will run fine for a few samples, and then give another error. The message it gives is: 16 items requested but only 7 read So D is a 7x1 vector, and the program dies when it tries to assign D to the slice of Signal (ValueError: shape mismatch: objects cannot be broadcast to a single shape). Onwindows, the Python version is 2.5.2, and the most recent numpy and scipy are being used as well. I tried using Enthought, but it gave this error as well, in addition to a c runtime error whenever I imported scipy (which is another post topic...). Any ideas on what might be causing this? Is there a way to debug the fromfile function? And, remember, this works perfectly on a Mac. Would compiling everything (python, scipy, numpy) potentially solve this? Did you open the file in binary mode ? Greetings, Uwe Yes I did. Would that make a difference between a mac andwindows? Thanks Uwe, Thanks for the suggestion. I passed rb to the open file command, not 'rb' which made a difference. I thought it opened in binary, but it did not, and it seems windows is not as good unix for dealing with this situation. Adam -- http://mail.python.org/mailman/listinfo/python-list
Re: fromfile error on windows, not mac
jadamwil wrote: On Jul 22, 2:05 am, Uwe Schmitt [EMAIL PROTECTED] wrote: jadamwil schrieb: Hello, I am using the numpy fromfile function to read binary data from a file on disk. The problem is that the program runs fine on a Mac, but gives an error or warning on windows when trying to read the data. I use it like this: Signal = zeros((N, 16), dtype=float32) for sample in range(0, N): # this function gets the next position in the file to seek to s = getFilePos(sample) # go to the correct location in the file; this IS checked to make sure it is within the file mFile.seek(s) # read the 16 float32 values from the file D = fromfile(mFile, dtype=numpy.float32, 16) # save D in Signal Signal[sample, :] = D This will fail when sample is ~4. If I change the range to (5,N), skipping the bad file location, it will run fine for a few samples, and then give another error. The message it gives is: 16 items requested but only 7 read So D is a 7x1 vector, and the program dies when it tries to assign D to the slice of Signal (ValueError: shape mismatch: objects cannot be broadcast to a single shape). On windows, the Python version is 2.5.2, and the most recent numpy and scipy are being used as well. I tried using Enthought, but it gave this error as well, in addition to a c runtime error whenever I imported scipy (which is another post topic...). Any ideas on what might be causing this? Is there a way to debug the fromfile function? And, remember, this works perfectly on a Mac. Would compiling everything (python, scipy, numpy) potentially solve this? Did you open the file in binary mode ? Greetings, Uwe Yes I did. Would that make a difference between a mac and windows? Thanks In a word, yes. the values for bytes that have issues are 10 and 13. --Scott David Daniels [EMAIL PROTECTED] -- http://mail.python.org/mailman/listinfo/python-list
