I am a beginner to Sage but I used to work with R. I know that I can create a R syntax cell by putting %r at the beginning of the cell. But there are a lot of examples which use the r.xyz syntax (for example: x = r([10.4,5.6,3.1,6.4,21.7]); x). But none of these examples work for me, what am I doing wrong?
Hello, the r in CoCalc's Sage Worskheets is different from the r in Sage itself. The reason is that %r at the top of a cell launches the execution in an R jupyter kernel. Different philosophy altogether.
However, you can do r = R() in a sagews which creates and defines the same R-interpreter r.
r = R()
r.summary(r([1,2,3,2]))
When Sage starts, r is predefined as the R interpreter.
(Edit: this does not seem to be the case in CoCalc.)
In a new Sage session, with r predefined as above, the following works:
sage: r
R Interpreter
sage: x = r([10.4,5.6,3.1,6.4,21.7]); x
[1] 10.4 5.6 3.1 6.4 21.7
If in such a Sage session we assign some other value to r,
then it stops working (of course).
sage: r = 2
sage: r
2
sage: x = r([10.4,5.6,3.1,6.4,21.7]); x
Traceback (most recent call last)
...
TypeError: 'sage.rings.integer.Integer' object is not callable
If we reset r, then it works again.
sage: reset('r')
sage: r
R Interpreter
sage: x = r([10.4,5.6,3.1,6.4,21.7]); x
[1] 10.4 5.6 3.1 6.4 21.7
To set r to be the R interpreter, whether the Sage
being used predefines r that way or not, use:
sage: from sage.interfaces.r import r
In a Sage session where r was initially the R interpreter,
but was then redefined to be something else, this can also
be used, instead of reset('r'), to restore r as the R interpreter.
Thank you for your answer. I am using Sage via CoCalc. When I open a new Sage worksheet and type:
r
x = r([10.4,5.6,3.1,6.4,21.7]); x
I get:
<function r="" at="" 0x7fd8f6b5f5f0="">
Error in lines 1-1 Traceback (most recent call last): File "/cocalc/lib/python2.7/site-packages/smc_sagews/sage_server.py", line 1013, in execute exec compile(block+'\n', '', 'single') in namespace, locals File "", line 1, in <module> File "/cocalc/lib/python2.7/site-packages/smc_sagews/sage_salvus.py", line 2168, in r return r.jupyter_kernel(code,**kwargs) File "/cocalc/lib/python2.7/site-packages/smc_sagews/sage_jupyter.py", line 179, in run_code msg_id = kc.execute(code) File "/ext/sage/sage-8.0/local/lib/python2.7/site-packages/jupyter_client/client.py", line 244, in execute raise ...
... ValueError('code %r must be a string' % code) ValueError: code [10.4000000000000, 5.60000000000000, 3.10000000000000, 6.40000000000000, 21.7000000000000] must be a string
Ok, when I use https://sagecell.sagemath.org/ it works perfectly fine.
Asked: 2017-12-08 18:07:11 +0100
Seen: 673 times
Last updated: Jul 07 '22
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We need much more information to understand your problem. Which version of Sage were you using before it failed? Was it Sage on your computer or online? Was it the Sage notebook or Jupyter?
+1 with Vincent. What did you type precisely to get an error ? On latest Sage version, i have:
Thanks for reporting this bug. This bug is now tracked at https://github.com/sagemathinc/cocalc/issues/2564 .