Added min_fixed and max_fixed options for Float in printers

[mijo2]

References to other Issues or PRs

Fixes #7847

Brief description of what is fixed or changed

--> Exposed min_fixed and max_fixed options for printers to print floating point numbers

Other comments

Example:

>>> from sympy import *
>>> from sympy.printing.str import StrPrinter
>>> StrPrinter({'full_prec': False, 'min': -2, 'max':2}).doprint(Float('10000000', 5))
'1.0e+7'
>>> StrPrinter({'full_prec': False, 'min': -2, 'max':2}).doprint(Float('10000000'))
'1.0e+7'
>>> StrPrinter({'full_prec': False, 'min': -2, 'max':8}).doprint(Float('10000000'))
'10000000.0'
>>> StrPrinter({'full_prec': False, 'min': -2, 'max':7}).doprint(Float('10000000'))
'1.0e+7'
>>> StrPrinter({'full_prec': False, 'min': -2, 'max':7}).doprint(Float('0.45'))
'0.45'
>>> StrPrinter({'full_prec': False, 'min': -1, 'max':7}).doprint(Float('0.45'))
'4.5e-1'
>>> 

As you can see, the bounds are exclusive.

Release Notes

• printing
  • Added min and max options for printers to set a range for floating point numbers that can
    be printed in fixed-point format.

[sympy-bot]

✅

Hi, I am the SymPy bot (v149). I'm here to help you write a release notes entry. Please read the guide on how to write release notes.

Your release notes are in good order.

Here is what the release notes will look like:

• printing
  • Added min and max options for printers to set a range for floating point numbers that can
    be printed in fixed-point format. (#18477 by @mijo2)

This will be added to https://github.com/sympy/sympy/wiki/Release-Notes-for-1.6.

Note: This comment will be updated with the latest check if you edit the pull request. You need to reload the page to see it.

Click here to see the pull request description that was parsed.

#### References to other Issues or PRs

Fixes #7847 

#### Brief description of what is fixed or changed

--> Exposed min_fixed and max_fixed options for printers to print floating point numbers

#### Other comments

Example:
```
>>> from sympy import *
>>> from sympy.printing.str import StrPrinter
>>> StrPrinter({'full_prec': False, 'min': -2, 'max':2}).doprint(Float('10000000', 5))
'1.0e+7'
>>> StrPrinter({'full_prec': False, 'min': -2, 'max':2}).doprint(Float('10000000'))
'1.0e+7'
>>> StrPrinter({'full_prec': False, 'min': -2, 'max':8}).doprint(Float('10000000'))
'10000000.0'
>>> StrPrinter({'full_prec': False, 'min': -2, 'max':7}).doprint(Float('10000000'))
'1.0e+7'
>>> StrPrinter({'full_prec': False, 'min': -2, 'max':7}).doprint(Float('0.45'))
'0.45'
>>> StrPrinter({'full_prec': False, 'min': -1, 'max':7}).doprint(Float('0.45'))
'4.5e-1'
>>> 
```
As you can see, the bounds are exclusive.

#### Release Notes

<!-- BEGIN RELEASE NOTES -->
* printing
  * Added min and max options for printers to set a range for floating point numbers that can\
    be printed in fixed-point format.
<!-- END RELEASE NOTES -->

Update

The release notes on the wiki have been updated.

[sylee957]

I'd agree to add this to string printers,
I'm not sure that it's useful for code printers unless it's about printing human-readable code.

[mijo2]

Ok @sylee957, I will add min_fixed and max_fixed options only for Latex printers and string printers.

[codecov]

Codecov Report

Merging #18477 into master will decrease coverage by 21.731%.
The diff coverage is 100%.

@@              Coverage Diff               @@
##            master    #18477        +/-   ##
==============================================
- Coverage   75.323%   53.592%   -21.732%     
==============================================
  Files          637       640         +3     
  Lines       167068    167185       +117     
  Branches     39416     39429        +13     
==============================================
- Hits        125842     89599     -36243     
- Misses       35692     71744     +36052     
- Partials      5534      5842       +308

[asmeurer]

This needs tests.

I wouldn't put this in the code printers. For the code printers, it is more important to print the exact float value so precision isn't lost. Different parameters might exist to approximate float literals in the code printers, but those would work differently than these, which are based on visual output rather than mathematical rounding.

[mijo2]

@asmeurer thanks for your feedback! I have already removed the options from codeprinters. I will start making test cases for latex printers and string printers and will add them soon along with updating the docstring for adding this feature.

[mijo2]

@asmeurer I have added the tests for string printers as of now. Working on tests for latex printers.

[mijo2]

@asmeurer I have added the tests for latex printers as well.

@sylee957 @asmeurer You can review this now to check if anything else needs to be changed or added. Thanks.