If you are using vectors you may want to look at galgebra (built on top
of sympy ) -
https://galgebra.readthedocs.io/en/latest/
It can be used simply as a regular vector algebra/calculus library.
On 2/8/22 11:18 AM, Rajeev Singh wrote:
Thanks Jonathan,
I guess I will stick with my approach for now. The behavior of
sympy.vector may actually be a bug as this trick puts the unit vector
in the middle of the expression -
In [6]: vecB = Bx * C.i
In [7]: vecB
Out[7]:
⎛ ⎛y_C⎞ ⎛ 5 ⎞⎞
⎜2⋅sin⎜───⎟ i_C⋅cos⎝10 ⋅t⎠⎟
⎜ ⎜ 3⎟ ⎟
⎜ ⎝10 ⎠ ⎟
⎜─────────────────────⎟
⎜ 4 ⎟
⎝ 10 ⎠
Perhaps sympy may consider displaying large and small numbers using
this notation, something like
https://github.com/gutow/round_using_error, by default for latex and
pretty print. I think mathematica does something similar.
Best wishes,
Rajeev
On Tue, 8 Feb 2022, 7:13 p.m. gu...@uwosh.edu, <gu...@uwosh.edu> wrote:
Rajeev,
I have done a little work with the sympy print/rendering package.
Unfortunately, this looks like something that needs to adapt those
mechanisms. Initially, I would suggest a specialized wrapper that
determines the proper powers and then sends an adapted expression
to the pretty_print package. Depending on how the vector printing
works you may have to send strings not specialized symbols. I am
not sure the pretty_print code itself could be adapted to what you
want and still be compatible with everything else.
Jonathan
On Tuesday, February 8, 2022 at 12:02:19 AM UTC-6 Rajeev wrote:
Thanks Jonathan,
Perhaps the following example explains what I want to do.
Using pretty print we get -
In [5]: Bx = 2e-4 * cos(1e5 * t) * sin(1e-3 * y)
In [6]: Bx
Out[6]: 0.0002⋅sin(0.001⋅y_C)⋅cos(100000.0⋅t)
In [7]: Bx = 2 * ten**(-4) * cos(ten**5 * t) * sin(ten**(-3) * y)
In [8]: Bx
Out[8]:
⎛y_C⎞ ⎛ 5 ⎞
2⋅sin⎜───⎟⋅cos⎝10 ⋅t⎠
⎜ 3⎟
⎝10 ⎠
─────────────────────
4
10
Is there a better way to achieve the last behaviour to improve
readability in the terminal with pretty print?
Also using this hack messes up pretty print if used with
sympy.vector objects, which is perhaps a bug.
Best wishes,
Rajeev
On Mon, 7 Feb 2022 at 19:06, gu...@uwosh.edu <gu...@uwosh.edu>
wrote:
I'm not sure of your exact use case, but maybe what I do
when rounding numbers to match their errors will give you
some ideas. https://github.com/gutow/round_using_error. In
this case I end up determining the power of ten for the
scientific notation using log base 10.
Jonathan
On Monday, February 7, 2022 at 4:55:47 AM UTC-6 Rajeev wrote:
Dear group,
What would be the best way to get numbers in the form
10^{...} while
using pretty print or latex? The following hack works -
ten = symbols("10", positive=True)
eps, mu = 4*pi*ten**(-11), ten**(-5)
but is messing up pretty print when used with
sympy.vector objects.
Couldn't find anything on this in the mail archives.
Best wishes,
Rajeev
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