Re: Packages--Problem in evaluating functions from my own package!!!
- To: mathgroup at smc.vnet.net
- Subject: [mg67535] Re: Packages--Problem in evaluating functions from my own package!!!
- From: albert <awnl at arcor.de>
- Date: Fri, 30 Jun 2006 04:14:02 -0400 (EDT)
- References: <e7vl0q$sn4$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
hi, > I create a package for two importantes functions of my thesis. But when I > load my package, sometimes I can evaluate my functions but all the time > not. do I get this right: sometimes it works sometimes not? > Hereby a piece of my code: > -------------------------- > > BeginPackage["`METHODECN`"]; this is not necessarily wrong, but probably not what what you want: note the leading ` which makes this create the context Global`METHODECN`, _if_ the context is Global` when you load the package. If you load the package from another context it will be anothercontext`METHODECN`. Not sure, but could be related to your problem. My suggestion is to use BeginPackage["METHODECN`"] until you are very sure you know that you want BeginPackage["`METHODECN`"] > SetDirectory["I:\spaceMaths"]; Why that? It would not be necessary usually and if anything within your package relies on Directory[] to be set to this path it is very likely to cause trouble. It is usually better to construct absolute pathnames for the files you want to access or even better to take advantage of the search mechanisms within mathematica to find files in $Path... > psiplusCN::usage = "psiplusCN[cn] evaluate Psi+"; > psimoinsCN::usage = " psimoinsCN[cn,c]evaluate Psi-"; > > Begin["`Private`"] > > Off[General::spell, General::spell1, General::precw]; in the package you won't need to switch off the spell messages, they will not be issued for definitions in the package anyway. It would also be cleaner to switch the messages on when you are done... > WorkingPrecision -> 40; > > (*** ** *** Module Psi + *******) > psiplusCN[cn_] := Module[{i}, psiplus = Table[If[i == 1, 1, 0], {i, 1, > cn}]; > Return[psiplus];]; > > (*** ** *** Module ksi *******) > ksi[x_] := Module[{ξ, ksinum}, > ksinum = FindRoot[1.0 - (x* ArcTanh[ξ])/ξ == 0.0, { ξ, > 0.01}, \ > WorkingPrecision -> 20]; > ξ = ξ /. ksinum; > Return[ξ] ;]; > > (*** ** *** Module Psi - *******) > psimoinsCN[cn_, c_] := Module[{Zplus, > Zmoins, DomP, GlnP, GlnP2, Vp, Wn, delta, integpp, ...... M, A, Y, > ξ}, > > .... > > Return[LinearSolve[M, Y]]]; > End[]; > EndPackage[]; looks ok... > When I load my package: > SetDirectory["I:\spaceMaths"]; Have you tried to put your package file into one of Application-Directories, e.g. ToFileName[{$UserAddOnsDirectory},"Applications"] ? What you actually need to do so that mathematica finds the package is to put it in one of the directories that are listed in $Path. Since "." is among these directories the SetDirectory usually works, but is more like a side effect of changing the working directory... One more thing: what kind of drive is I: ? if it is a network drive it might be that the drive is not always available. Also you should use a double \\ after I:, otherwise you will have problems with some characters following it like \n. I would also recommend to use small letters only for your directories and filenames as long as you see problems with files that are not found... > << METHODECN.m; note that you can (and probably should) use: << METHODECN` or Needs["METHODECN`"] > psiplusCN[1] > psimoinsCN[1, 0.8] > > I get this error message: > Get::noopen, Cannot open "METHODECN.m if you get this, the rest can't work. It is a clear indicator that for whatever reason mathematica cannot find the file. Check if the directory it is in is listed in $Path at the moment you are trying to load it. Most probably it is not and that's the reason why it does not work. If you rely on changing the directory to find the package you will need to make sure that at the time the package is loaded, the working directory (that is the output of Directory[]) is still "I:\\spaceMaths". hth albert