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Why must a nonlinear activation function be used in a backpropagation neural network? [closed]

I've been reading some things on neural networks and I understand the general principle of a single layer neural network. I understand the need for aditional layers, but why are nonlinear activation functions used? ...
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Fast way of finding lines in one file that are not in another?

... You can achieve this by controlling the formatting of the old/new/unchanged lines in GNU diff output: diff --new-line-format="" --unchanged-line-format="" file1 file2 The input files should be sorted for this to work. With bash (and zsh) you ...
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How to set RelativeLayout layout params in code not in xml?

For example I want to add 3 buttons on screen: one align left, one align center, last one align right. 5 Answers ...
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How to subtract a day from a date?

I have a Python datetime.datetime object. What is the best way to subtract one day? 6 Answers ...
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Operator overloading : member function vs. non-member function?

I read that an overloaded operator declared as member function is asymmetric because it can have only one parameter and the other parameter passed automatically is the this pointer. So no standard exists to compare them. On the other hand, overloaded operator declared as a friend is symmetric...
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Visual Studio SP1 error: silverlight_sdk.msi is unavailable

...'m trying to install the SP1 for Visual Studio 2010. I first installed the beta and it worked fine. Then I used the web platform installer to install the SQL CE Compact 4, which I assume installed the full SP1 after (this installation took over 12 hours, so I canceled it). The web platform installer...
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Real mouse position in canvas [duplicate]

I'm trying to draw with the mouse over a HTML5 canvas, but the only way that it seems to work well is if the canvas is in the position 0,0 (upper left corner) if I change the canvas position, for some reason it doesn't draw like it should. Here is my code. ...
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How can I do something like a FlowLayout in Android?

... If you watch the talk I gave at the Devoxx University day (available on parleys.com) you will learn how to do it yourself. During the talk I wrote a FlowLayout implementation live on stage to show how simple it is to write custom layouts. The implementation is hosted here. ...
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Change a column type from Date to DateTime during ROR migration

...my column type from date to datetime for an app I am making. I don't care about the data as its still being developed. 5 An...
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Pry: show me the stack

Using Pry in Rails, when I hit a breakpoint in the code binding.pry 5 Answers 5 ...