Fwd: Re: tooltip - evaluate function at point

*To*: mathgroup at smc.vnet.net*Subject*: [mg98794] Fwd: Re: tooltip - evaluate function at point*From*: "Cristina Ballantine" <cballant at holycross.edu>*Date*: Sun, 19 Apr 2009 04:55:22 -0400 (EDT)

David's answer completely solved my problem. Thank you! Cristina ----------------------------- HI Cristina , Of course the important question at this point is to see whether we are using the same version of Mathematica. I am doing this with Version 7 on OSX. It seems to work for me both on the contour and off of it. I agree that the documentation for ContourLabels is somewhat obscure. So, I just tested the code that I sent to you in Mathematica 6 and indeed it does not behave properly. Clearly there is a bug in version 6 that was fixed in version 7. So I have to trick the whole graphics thing in Verions 6 to make this work. Try the following (I use a transparent rectangle above the contourplot so that the Tooltip is getting its coordinates from the rectangle rather than getting it from the buggy ContourPlot): With[{plot = ContourPlot[Arg[Gamma[x + I*y]] == 0, {x, -10, 10}, {y, -10, 10}, PlotPoints -> 20, ContourLabels -> None], rect = Graphics[{Opacity[0], Rectangle[{-10, -10}, {10, 10}]}]}, Dynamic@ Tooltip[Show[plot, rect], With[{z = Complex @@ MousePosition["Graphics"]}, {z, Gamma[z]}]]] Best, David At 9:46 PM -0400 4/17/09, you wrote: >Hi David, > >I copied and pasted the code and it does the exact same thing as the >previous code you wrote: it gives the value of Gamma at all points >other than the points on the curves. At the points of the curves it >just gives Arg[Gamma[x+I*y]]==0. > >I couldn't find anything in the documentation of ContourLabels >referring to tooltip other than "The label can be any expression or >graphic, and can include constructs such as Tooltip" but I don't >understand what that means. It seems to me that ContourLabels is >just a label on the contours on the plot. If specified, they appears >regardless of the position of the mouse. But maybe I am wrong. > >Thanks again for your help. > >Cristina > >>>> David Reiss <dreiss at scientificarts.com> 04/17/09 9:05 PM >>> >Hi Crristina, > >I am slightly puzzled. The code that I wrote below does seem to do >exactly what you wish. Also if you review the documentation for >ContourLabels you will see how it controls the tooltip. > >Best regards, > >David > >At 8:43 PM -0400 4/17/09, you wrote: > > >>Hi David, >> >>Thank you for looking into this again. Unfortunately, ContourLables >>doesn't seem to be connected to Tooltip. There must be some other >>way to turn off the tooltip label and overwrite it with a new label. >> >> >>Best wishes, >> >>Cristina >> >>>>> David Reiss <dreiss at scientificarts.com> 04/17/09 8:52 AM >>> >>Hi Cristina, >>The problem here seems to be that ContourPlot has built into it a tooltip >>that tells you which equation the contour lines correspond to. This >>actually was what I thought was a bug in my example, but I realize that it >>is a "feature" of ContourPlot. I have to think of how to turn that off, as >>that tooltip seems to preempt any other tooltip that is imposed on the plot >>as I did. >> >>....Ah, this seems to do the trick, I think, using the option ContourLabels >>-> None]: >> >>With[{plot = >> ContourPlot[Arg[Gamma[x + I*y]] == 0, {x, -10, 10}, {y, -10, 10}, >> PlotPoints -> 20, ContourLabels -> None]}, >> Dynamic@Tooltip[ >> plot, (With[{z = Complex @@ MousePosition["Graphics"]}, {z, Gamma[z]}])]] >> >>Yes, if you look up the ContourLabels documentation, this is indeed what's >>needed. >> >> >>Does this work for you? >> >> >>Best regards, >> >> >>David >> >> >>On Thu, Apr 16, 2009 at 9:50 PM, Cristina Ballantine <cballant at holycross.edu >>> wrote: >> >>> David, >>> >>> Thank you for your help. Unfortunately, this shows the value of Gamma at >>> all points other than the points on the solution curves given by >>> Arg[Gamma[x+I*y]]==0. When the mouse goes over the points on the curve the >>> tooltip gives only "Arg[Gamma[x+I*y]]==0. But I am interested in the value >>> of Gamma precisely at the points on the curves above. >>> >>> Best wishes, >>> >>> Cristina >>> >>> >>> <dbreiss at gmail.com> 04/16/09 8:09 PM >>> >>> Here is the start of one sort of approach. It seems ot have some > >> bugginess though. But perhaps this will get you going: >>> >>> With[{plot = >>> ContourPlot[Arg[Gamma[x + I*y]] == 0, {x, -10, 10}, {y, -10, 10}, >>> PlotPoints -> 20]}, >>> Dynamic@Tooltip[ >>> plot, >>> (With[{z = Complex @@ MousePosition["Graphics"]}, >>> {z, Gamma[z]}]) >>> ] >>> ] >>> >>> >>> >>> I suspect that someone else will give you a more stable approach.... >>> >>> --David >>> >>> >>> >>> On Apr 16, 4:18 am, "Cristina Ballantine" <cball... at holycross.edu> >>> wrote: >>> > I would like to plot the solutions to an equation using ContourPlot and >>> > add a tooltip that evaluates a different function at the points on the >>> > solution. In particular, for the plot >>> > >>> > ContourPlot[Arg[Gamma[x + I*y]] == 0, {x, -10, 10}, {y, -10, 10}, >>> PlotPoints -> 20] >>> > >>> > when the cursor is over a solution point I would like the ToolTip to >>> > display the value of Gamma at that point. Is this possible? If so, any >>> > suggestion is greatly appreciated. >>> > >>> > Cristina >>> >>> >>> >> >> >>-- >>This message and any attachments, may contain confidential and/or >>legally privileged information. If you are not the intended >>recipient of the message by the original sender, please destroy it. >>Message and attachments copyright (c) 2009, all rights reserved. Any >>unauthorized dissemination, distribution or copying is strictly >>forbidden. > > >-- > ><><><><><><><><><>><><><>><><><> > David Reiss, Ph.D; Scientific Arts, LLC . > http://www.scientificarts.com ><><><><><><><><><>><><><>><><><> >This message and any attachments, may contain confidential and/or >legally privileged information. If you are not the intended >recipient of the message by the original sender, please destroy it. >Message and attachments Copyright (c) 2009, all rights reserved. -- <><><><><><><><><>><><><>><><><> David Reiss, Ph.D; Scientific Arts, LLC . http://www.scientificarts.com <><><><><><><><><>><><><>><><><> This message and any attachments, may contain confidential and/or legally privileged information. If you are not the intended recipient of the message by the original sender, please destroy it. Message and attachments Copyright (c) 2009, all rights reserved. --=__Part7A52D74A.0__=--

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