Re: Kernel crash, version 7.0, windows XP, when using slider in Manipulate

*To*: mathgroup at smc.vnet.net*Subject*: [mg109401] Re: Kernel crash, version 7.0, windows XP, when using slider in Manipulate*From*: Albert Retey <awnl at gmx-topmail.de>*Date*: Sun, 25 Apr 2010 06:24:56 -0400 (EDT)*References*: <hqu8dj$rqc$1@smc.vnet.net>

Am 24.04.2010 09:59, schrieb Nasser M. Abbasi: > Hi; > > I was wondering if someone has a real Mathematica debugger that they could > use to help me find where this bug is? I do standard mathematica. > > I spend the last 6 hrs on this, and can't find the problem. I do not have a > debugger, so it is impossible to find where the bug is since it is a kernel > crash and I do not see what I am doing wrong. One thing I know is that if I > all the Epilog code in the code, the problem goes away. > > This is the problem: > > I have a manipulate, with a plot being drawn using Dynamics in the control > area. The plots uses control variables. > > When I enter a value of a control variable using the slider (i.e. normal > method) there is no problem. no crash, even though the slider goes over the > same input value which will cause a crash when I enter this input as > follows: > > I open the slider by clicking open on the small "+" next to the slider, and > type in a numerical value, the kernel crashes. > > For example, There is a control variable called zeta in the program. When I > move the slider no crash happens. When I open the slider window and type in > a value then the crash happens. The strange thing, if I type in "1" > instead of "1.0" then it will crash, but if I type "1." no crash is seen > (i.e. add a decimal point !) > > I have a screen shot here to help you see the problem: > > http://12000.org/tmp/bug_input_slider/screen_shot.png > > And the notebook is in the same folder, here: > > http://12000.org/tmp/bug_input_slider/ > > it is called filter_v9.nb > > All what you have to do just download the notebook, open it in Mathematica, > open the slider input area just like shown in the above image, and type in 1 > Next, simply hit any other control with the mouse to activate, now the > kernel will crash. > > As I said, if I type 1. instead of 1 (i.e. with a decimal point), the > problem does not happen. > > Any one has version 7.0.1? does the problem happens with it also? I have not tried any of your code and I could be completley wrong, but what you describe looks a lot like your code makes mathematica crash for input which are not machine precision numbers (1 is very different to 1. in this respect). When you use the slider, I think it will always return machine precision numbers so it could explain the difference. Have you tried to run the code within the Dynamic with setting zeta=1 without the Dynamic? Is that turns out to be the problem a N[] at the right place will probably make your problem go away... Here is a little example which shows my point: Manipulate[{x, Head[x]}, {x, 0, 1}] hth, albert