[Rpy] Addition to R vectors not behaving as expected (as in R)
This occurs with the latest 2.3. Example case: robjects.IntVector([0,1,2]) + 1 This is what it returns IntVector - Python:0x7fadd7a7a320 / R:0xb385b18 [ 0,1,2,1] While I'd expect, like in R c(0,1,2) + 1 [1] 1 2 3 Is this a bug, or do I have to do things differently? -- Luca Beltrame, Ph.D. - Translational Genomics Unit Oncology Department, Mario Negri Institute signature.asc Description: This is a digitally signed message part. -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_mar___ rpy-list mailing list rpy-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rpy-list
Re: [Rpy] Addition to R vectors not behaving as expected (as in R)
On 2013-03-21 02:59, Luca Beltrame wrote: This occurs with the latest 2.3. Example case: robjects.IntVector([0,1,2]) + 1 This is what it returns IntVector - Python:0x7fadd7a7a320 / R:0xb385b18 [ 0,1,2,1] While I'd expect, like in R c(0,1,2) + 1 [1] 1 2 3 Is this a bug, or do I have to do things differently? The idea was that a vector would behave like a Python sequence. For example x = [1,2] x + [3, ] [1,2,3] Now where I met ambiguity bridging the two worlds (Python and R) is that there is no such thing as a scalar in R (they are vectors of length 1). In Python this is an error. x+3 Traceback (most recent call last): File stdin, line 1, in module TypeError: can only concatenate list (not int) to list Since I am converting Python scalars into vectors whenever passing them to R I must have thought that this should be the same for when __add__ is used. Now I see that in the current robjects model, `robjects.IntVector([0,1,2]) + 1` should raise a type Error. To use R-style operation, I solved this by adding a delegating attribute called `ro` (R operator). For example here: robjects.IntVector([0,1,2]).ro + 1 (documentation is here: http://rpy.sourceforge.net/rpy2/doc-2.3/html/vector.html#operators ). L. -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_mar ___ rpy-list mailing list rpy-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rpy-list -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_mar___ rpy-list mailing list rpy-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rpy-list
Re: [Rpy] Addition to R vectors not behaving as expected (as in R)
On 21 March 2013 14:28, Laurent Gautier lgaut...@gmail.com wrote: In Python this is an error. x+3 Traceback (most recent call last): File stdin, line 1, in module TypeError: can only concatenate list (not int) to list With a list, yes. With a numpy array, which is probably as relevant for many rpy2 users, adding an integer adds it to every element: In [4]: x + 1 Out[4]: array([1, 2, 3]) Thomas -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_mar___ rpy-list mailing list rpy-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rpy-list
Re: [Rpy] Addition to R vectors not behaving as expected (as in R)
In data giovedì 21 marzo 2013 15:38:22, Thomas Kluyver ha scritto: With a list, yes. With a numpy array, which is probably as relevant for many rpy2 users, adding an integer adds it to every element: That was actually the reason I expected it to work. However it's not a huge issue to use .ro (I do in several other places for selection). – Luca Beltrame, Ph.D. - Translational Genomics Unit Oncology Department, Mario Negri Institute signature.asc Description: This is a digitally signed message part. -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_mar___ rpy-list mailing list rpy-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rpy-list
