Re: holding boxes verbatim

*To*: mathgroup at smc.vnet.net*Subject*: [mg56258] Re: holding boxes verbatim*From*: Chris Chiasson <chris.chiasson at gmail.com>*Date*: Wed, 20 Apr 2005 05:31:54 -0400 (EDT)*References*: <00aa01c544e3$6db4af30$6400a8c0@Main>*Reply-to*: Chris Chiasson <chris.chiasson at gmail.com>*Sender*: owner-wri-mathgroup at wolfram.com

As a follow up to those who requested clairification: Consider the simple examples: HoldAllComplete[b*(a + s*m)] (*notice the order of the vairables inside the inner Times is rearranged on output*) HoldAllComplete[(x)^(1/2)] (*notice the reformatting of an expression to the power 1/2 is reformatted to the square root of the expression*) HoldAllComplete[(x/y)(h/g)] (*notice the elimination of the parenthesis*) The reason these things happen is that the boxes are parsed into Mathematica input such as Times[b,Plus[a,Times[s,m]]]. I need a way to work directly with the boxes, but still at least do some variable substitution. Thank you again for your time. On 4/19/05, Carl K. Woll <carlw at u.washington.edu> wrote: > "Chris Chiasson" <chris.chiasson at gmail.com> wrote in message > news:d42l18$3gf$1 at smc.vnet.net... > > Dear Math Group gurus, > > > > Mathematica is annoying me. I would like some way to type in a two > > dimensional box form (representing an arbitrary expression) and assign > > it to a symbol. I would then like to be able to operate on the > > expression by, for instance: > > 1 printing it > > 2 printing it with some variables' values substitued into it > > 3 and finally evaluating it > > > > Hold and its variants do not do the job because they prevent > > expression evaluation, but I need something that will keep its box > > form exactly as I have typed it. > > > > Please, how does one do this? > > > > A method for doing this is very useful to me because my professors > > like to see the variables substitued into the original (not > > Mathematica reparsed original, but verbatim original) equations. > > > > Thank you for your very valuable time, > > An example of the desired behavior would be helpful. At any rate, have you > tried using HoldForm? For example: > > expr = HoldForm[2^(x+1)]; > expr > expr /. x->2 > ReleaseHold[ expr /. x->2 ] > > x + 1 > 2 > 2 + 1 > 2 > 8 > > I used InputForm instead of a 2D box form for expr for legibility, but using > a 2D box form for expr won't cause any problems. > > If the above is not helpful, please give an example of the behavior you > desire. > > Carl Woll > > -- Chris Chiasson Kettering University Mechanical Engineering Graduate Student 1 810 265 3161

**Follow-Ups**:**Re: Re: holding boxes verbatim***From:*Chris Chiasson <chris.chiasson@gmail.com>