derivatives and subscripts
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From: fizzy on 29 Mar 2010 06:20 I try to use subscripts as much as possible even for defining functions of say x,y,z....Note that I use the palette to do this which I can't reproduce here....example.....defining the 'x' component of the Electric Field which is a function of Cartesian coordinate 'x'...... E subscript Script x [x] where the E subscript comes from the Basic Math palette....and the Script x comes from the Special Characters palette.....E is taken from the Greek letters.... there is no problem with this until I take the derivative....I get the following output... (E subscript Script x) ' [x]...... Prior to version 6 I got what i wanted, namely.... E subscript Script x ' [x] ...... ......I tried a rule to get rid of the extra parentheses as well as a Format statement....but neither fixed it....I also tried the Notations package to Symbolize subscripts but still get the same output.....here is how I tried to use a rule.... rule={(E subscript Script x) ' [x] -> E subscript Script x ' [x]//HoldForm......} any ideas? thanks...jerry blimbaum
From: Thomas Melehan on 30 Mar 2010 06:00 Subscripted variables don't behave well. Use Symbolize[subscripted variable] Needs[Notation] On Mar 29, 2010, at 6:20 AM, fizzy wrote: > I try to use subscripts as much as possible even for defining functions > of say x,y,z....Note that I use the palette to do this which I can't > reproduce here....example.....defining the 'x' component of the Electric > Field which is a function of Cartesian coordinate 'x'...... > > E subscript Script x [x] > > > where the E subscript comes from the Basic Math palette....and the > Script x comes from the Special Characters palette.....E is taken from > the Greek letters.... > > there is no problem with this until I take the derivative....I get the > following output... > > > (E subscript Script x) ' [x]...... > > Prior to version 6 I got what i wanted, namely.... > > E subscript Script x ' [x] ...... > > > .....I tried a rule to get rid of the extra parentheses as well as a > Format statement....but neither fixed it....I also tried the Notations > package to Symbolize subscripts but still get the same output.....here > is how I tried to use a rule.... > > rule={(E subscript Script x) ' [x] -> E subscript Script x ' > [x]//HoldForm......} > > any ideas? > > thanks...jerry blimbaum
From: DrMajorBob on 30 Mar 2010 06:03 > I try to use subscripts as much as possible even for defining functions > of say x,y,z... No surprise if you have problems, then. I prefer math and programming... not typesetting. Bobby On Mon, 29 Mar 2010 05:20:50 -0500, fizzy <fizzycist(a)knology.net> wrote: > I try to use subscripts as much as possible even for defining functions > of say x,y,z....Note that I use the palette to do this which I can't > reproduce here....example.....defining the 'x' component of the Electric > Field which is a function of Cartesian coordinate 'x'...... > > E subscript Script x [x] > > > where the E subscript comes from the Basic Math palette....and the > Script x comes from the Special Characters palette.....E is taken from > the Greek letters.... > > there is no problem with this until I take the derivative....I get the > following output... > > > (E subscript Script x) ' [x]...... > > Prior to version 6 I got what i wanted, namely.... > > E subscript Script x ' [x] ...... > > > .....I tried a rule to get rid of the extra parentheses as well as a > Format statement....but neither fixed it....I also tried the Notations > package to Symbolize subscripts but still get the same output.....here > is how I tried to use a rule.... > > rule={(E subscript Script x) ' [x] -> E subscript Script x ' > [x]//HoldForm......} > > any ideas? > > thanks...jerry blimbaum -- DrMajorBob(a)yahoo.com
From: Christoph Lhotka on 31 Mar 2010 07:32 Hi, as you may already know, the extra parentheses are not a problem from a calculational point of view (Mathematica will treat them correctly). I would leave them at the stage of calculations. If it is just a matter of format, try (at the end of your calculations) something like: 1) expr=Derivative[1,0][Subscript[f,1,2]][x,y] form=Derivative[ders__][Subscript[f_,sub__]][arg__]:>Subscript[f,sub,ders][arg] expr/.form therefore, the first subscripts will refer to the indices, the second half to the derivatives. Another possibility would be to 2) form=Derivative[ders__][Subscript[f_,sub__]][arg__]:>Derivative[ders][ToString[Subscript[f,sub],StandardForm]][arg] expr/.form To get the "old" format of Mathematica, but please note, that the header of the function is now converted to a string. Christoph On 03/30/2010 12:04 PM, DrMajorBob wrote: >> I try to use subscripts as much as possible even for defining functions >> of say x,y,z... >> > No surprise if you have problems, then. > > I prefer math and programming... not typesetting. > > Bobby > > On Mon, 29 Mar 2010 05:20:50 -0500, fizzy<fizzycist(a)knology.net> wrote: > > >> I try to use subscripts as much as possible even for defining functions >> of say x,y,z....Note that I use the palette to do this which I can't >> reproduce here....example.....defining the 'x' component of the Electric >> Field which is a function of Cartesian coordinate 'x'...... >> >> E subscript Script x [x] >> >> >> where the E subscript comes from the Basic Math palette....and the >> Script x comes from the Special Characters palette.....E is taken from >> the Greek letters.... >> >> there is no problem with this until I take the derivative....I get the >> following output... >> >> >> (E subscript Script x) ' [x]...... >> >> Prior to version 6 I got what i wanted, namely.... >> >> E subscript Script x ' [x] ...... >> >> >> .....I tried a rule to get rid of the extra parentheses as well as a >> Format statement....but neither fixed it....I also tried the Notations >> package to Symbolize subscripts but still get the same output.....here >> is how I tried to use a rule.... >> >> rule={(E subscript Script x) ' [x] -> E subscript Script x ' >> [x]//HoldForm......} >> >> any ideas? >> >> thanks...jerry blimbaum >> > >
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