Hi Stan,
On Thu, Mar 26, 2009 at 5:59 AM, Stan Schymanski <schym...@gmail.com>
> It seems that you and Jason are getting a firm grip on this, which is
> great. Just out of curiosity and my ignorance of the underlying code: Is
> your aim to hard-code certain functions, or is your aim to provide the
> users with the possibility of defining the latex representation of their
> functions? I assume it is the latter, as there is an indefinite number
> of possible function names. Could you confirm?
My current aim was to deal with the function names which are
named after Greek letters, and possibly with suffixes. For example:
function names such as "psi", "tau0", "alpha_mn" "Psi_alpha" etc.
Could you please give some examples for the later case? May be
I am missing your point.
Jason: I am attaching the patch for enhancing typesetting of
functions. I need to add doc-tests though. In the patch, I have
implemented all the situations that I planned to do.
Apart from the situations I mentioned earlier, it now also
supports following types of function name (single letters with
suffixes)
---------------
(6) function('f1',x) => f_{1}\left(x\right)
(7) function('T_sigma',x) => T_{\sigma}\left(x\right)
(8) function('R_ab',x) => R_{ab}\left(x\right)
----------------
Currently, the major problem is to figure out: whats going
wrong in typesetting "diff( psi(x), x)" even
though "exp(psi(x))" works beautifully. Similar issue
arises for "integrate", "conjugate"...
Cheers,
Golam
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# HG changeset patch
# User Golam Mortuza Hossain <gmhoss...@gmail.com>
# Date 1238095231 10800
# Node ID 194e7cf7dfe3ba07ac44a820341ae9ef47f30ddb
# Parent 17fe77f21e21c79cb989aaab2e2fe128d16beaa1
Adds supoort for type-setting functions as Greek letters
diff -r 17fe77f21e21 -r 194e7cf7dfe3 sage/calculus/calculus.py
--- a/sage/calculus/calculus.py Thu Mar 26 15:00:42 2009 -0300
+++ b/sage/calculus/calculus.py Thu Mar 26 16:20:31 2009 -0300
@@ -297,7 +297,7 @@
from sage.structure.parent_base import ParentWithBase
import operator
-from sage.misc.latex import latex, latex_variable_name
+from sage.misc.latex import latex, latex_variable_name, latex_function_name
from sage.misc.misc import uniq as unique
from sage.structure.sage_object import SageObject
@@ -9749,6 +9749,9 @@
{{{\it \partial}}\over{{\it \partial}\,x}}\,\left \lceil x \right \rceil
"""
+ name = latex_function_name(self._f._name)
+ if name is not False:
+ return "%s\\left(%s\\right)"%(name, ', '.join([latex(x) for x in self._args]))
try:
return latex(self._maxima_())
except:
diff -r 17fe77f21e21 -r 194e7cf7dfe3 sage/misc/latex.py
--- a/sage/misc/latex.py Thu Mar 26 15:00:42 2009 -0300
+++ b/sage/misc/latex.py Thu Mar 26 16:20:31 2009 -0300
@@ -756,6 +756,53 @@
'omega',
'Omega']
+def latex_function_name(x):
+ """
+ If possible return common function names such as alpha, beta1,
+ psi_00, R_mn, etc. as latex symbols otherwise return False.
+
+ This function is based largely on latex_variable_name function.
+ """
+ # For known names return them after preprending with "\\"
+ if x in common_varnames:
+ return "\\" + x
+
+ underscore = x.find("_")
+ if underscore == -1:
+ import re
+ # * The "\d|[.,]" means "decimal digit" or period or comma
+ # * The "+" means "1 or more"
+ # * The "$" means "at the end of the line"
+ m = re.search('(\d|[.,])+$',x)
+ if m is None:
+ prefix = x
+ suffix = None
+ else:
+ prefix = x[:m.start()]
+ suffix = x[m.start():]
+ else:
+ prefix = x[:underscore]
+ suffix = x[underscore+1:]
+ if len(suffix)== 0:
+ return False
+ # If suffix contains underscores then don't process
+ if suffix and suffix.find("_") != -1:
+ return False
+ # If prefix is not a common name or a more-than-one letters word
+ # then don't process
+ if prefix not in common_varnames and len(prefix) != 1:
+ return False
+
+ if prefix in common_varnames:
+ prefix = "\\" + prefix
+
+ if suffix and len(suffix) > 0:
+ if suffix in common_varnames:
+ suffix = "\\" + suffix
+ return '%s_{%s}'%(prefix, suffix)
+ else:
+ return '%s'%(prefix)
+
def latex_varify(a):
if a in common_varnames:
return "\\" + a
