[Octave-bug-tracker] [bug #53576] Symbolic pkg dsolve now not woeking

[Doug Stewart]

URL:
  <http://savannah.gnu.org/bugs/?53576>

                 Summary: Symbolic pkg dsolve now not woeking
                 Project: GNU Octave
            Submitted by: dastew
            Submitted on: Fri 06 Apr 2018 04:24:39 PM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Regression
                  Status: None
             Assigned to: None
         Originator Name: Doug Stewart
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 4.2.2
        Operating System: GNU/Linux

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Details:


running this code from octave wiki symbolic demos now fails.

 syms y(x) 
 de =diff(y, 3 ) +sqrt(2)*diff(y,2) + diff(y) == 0;
 f = dsolve(de, y(0) == 0, diff(y,1)(0) == 0 , diff(y,2)(0) == 1)
 ff=function_handle(rhs(f))
  x1=0:.01:10;
 y=ff(x1);
 plot(x1,y)
 grid minor on


with this error:


OctSymPy v2.6.0: this is free software without warranty, see source.
Initializing communication with SymPy using a popen2() pipe.
Some output from the Python subprocess (pid 3852) might appear next.
Python 3.5.2 (default, Nov 23 2017, 16:37:01)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> >>>
OctSymPy: Communication established.  SymPy v1.1.1.
>> testsym111
warning: passing floating-point values to sym is dangerous, see "help sym"
warning: called from
    double_to_sym_heuristic at line 50 column 7
    sym at line 373 column 13
    mtimes at line 65 column 5
    mtimes at line 61 column 5
    testsym111 at line 18 column 6
error: Python exception: NotImplementedError: CRootOf is not supported over
EX
    occurred at line 2 of the Python code block:
    sol=sp.dsolve(ode)
error: called from
    python_cmd at line 179 column 7
    dsolve at line 200 column 10
    testsym111 at line 19 column 4
>>


I am using ubuntu 16.04




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