Anyone know why I don't get symbolic results by default?

[Andre Yonadam]

I was writing out a Python file by hand and wasn't getting the symbolic results only when using default operators. For example, when dividing 1/3 it would return a decimal answer while if I used the Integral function it would give me the right result.

[Ondřej Čertík]

Hi Andre,

Can you post your Python code? In Python 2.x, 1/3 returns 0, while in
Python 3.x, 1/3 returns 0.3333. You can also turn on the Python 3.x
behavior on 2.x with a future import.

Ondrej

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[Jason Moore]

Does this help: http://docs.sympy.org/latest/gotchas.html#python-numbers-vs-sympy-numbers ?

Jason
moorepants.info
+01 530-601-9791

On Tue, Feb 17, 2015 at 9:16 AM, Andre Yonadam <agy...@gmail.com> wrote:

I was writing out a Python file by hand and wasn't getting the symbolic results only when using default operators. For example, when dividing 1/3 it would return a decimal answer while if I used the Integral function it would give me the right result.

--

[Aaron Meurer]

The SymPy Live shell does some preparsing of the input to prevent 1/3
from being converted to 0.33333333333. In a normal Python shell, this
does not happen. You should use Rational(1, 3) or S(1)/3. The link
Jason gave explains why this is necessary.

Aaron Meurer

On Tue, Feb 17, 2015 at 11:57 AM, Andre Yonadam <agy...@gmail.com> wrote:
> Hi thanks for the reply. I wanted to do a simple division and print it out.
> For example print("%d", 5/6). The problem is it doesn't return the formatted
> result like it would in the shell. Do I have to use the S function?

> https://groups.google.com/d/msgid/sympy/7ba91a47-6809-4aef-a693-db77e3265ce9%40googlegroups.com.

[Andre Yonadam]

Thanks. So the only way of doing in a normal Python shell is to use the S function. Does the S function have any limitations compared to the SymPy Live shell?

[Andre Yonadam]

Hi thanks for the reply. I wanted to do a simple division and print it out. For example print("%d", 5/6). The problem is it doesn't return the formatted result like it would in the shell. Do I have to use the S function?

On Tuesday, February 17, 2015 at 12:07:18 PM UTC-6, Aaron Meurer wrote:

[Andre Yonadam]

I was still wondering if there was anyway to change it so the SymPy handles the default data types or a way for Sympy to handle all the calculations symbolically automatically. For example I can do print(latex((Integer(1)/Integer(3)))) to get the desired output, but without the Integer it wouldn't return it in latex.

[Aaron Meurer]

If you use isympy, you can use isympy -i or isympy -I.

Aaron Meurer

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