Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2009

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Re: dynamicmodule with f[x_] possible?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg104663] Re: [mg104511] Re: [mg104470] dynamicmodule with f[x_] possible?
  • From: Matthew Kooshad <matthewkooshad at gmail.com>
  • Date: Fri, 6 Nov 2009 05:16:31 -0500 (EST)
  • References: <18085121.1257066820723.JavaMail.root@n11> <005701ca5af2$c7c19ae0$5744d0a0$@net>

rather than Sin@x , can i just use f[x_] := @x ? it's giving me a
problem with @x after the :=
thanks,

On Tue, Nov 3, 2009 at 9:42 PM, DrMajorBob <btreat1 at austin.rr.com> wrote:
> @ binds before the derivative... which I know from double-clicking on @ and
> finding that it highlights only N@f.
>
> N@f is just f (since it's not evaluating f yet and
>
> N@anySymbol
>
> anySymbol
>
> Hence, for instance:
>
> f[x_] := Sin@x
> N@f'[x]
>
> Cos[x]
>
> N is gone, but the derivative is still there, and that's what I'm seeing in
> the Panel. Derivatives.
>
> Bobby
>
> On Tue, 03 Nov 2009 18:56:13 -0600, Matthew Kooshad
> <matthewkooshad at gmail.com> wrote:
>
>> oh sorry, i had posted it to the group, but maybe it didn't go through
>> properly. i looked on the group and was able to see it.
>> here it is:
>> f[x_] := 0
>> DynamicModule[{x = 0, b = 0},
>>  Deploy[Style[
>>   Panel[Grid[
>>     Transpose[{{Style["x", Red], Style["b", Red], "sum", "diff",
>>        "product"}, {InputField[Dynamic[x]], InputField[Dynamic[b]],
>>        InputField[Dynamic[N@f'[x] + b], Enabled -> False],
>>        InputField[Dynamic[N@f'[x] - b], Enabled -> False],
>>        InputField[Dynamic[N@f'[x] b], Enabled -> False]}}],
>>     Alignment -> Right](*Grid*), ImageMargins -> 10](*Panel*),
>>   DefaultOptions -> {InputField -> {ContinuousAction -> True,
>>       FieldSize -> {{5, 30}, {1, Infinity}}}}](*Style*)](*Deploy*)]
>>
>> you see i am using the derivative there in the addition , subtraction,
>> and multiplication calculations. it is not using the derivative there
>> in the calculations however...
>>
>> thanks again for your help on figuring this out :)
>>
>> On Tue, Nov 3, 2009 at 5:22 PM, DrMajorBob <btreat1 at austin.rr.com> wrote:
>>>
>>> I have no idea what pieces of code you're putting together to see a
>>> failure.
>>> Send a complete example.
>>>
>>> Bobby
>>>
>>> On Tue, 03 Nov 2009 14:18:22 -0600, Matthew Kooshad
>>> <matthewkooshad at gmail.com> wrote:
>>>
>>>> ok, thanks for the note about N@.
>>>>
>>>> any idea why it doesn't work to put the derivative (N@f'[x]) there
>>>> rather than simply N@f[x] ?
>>>>
>>>> thanks!
>>>>
>>>> On Tue, Nov 3, 2009 at 2:16 PM, DrMajorBob <btreat1 at austin.rr.com>
>>>> wrote:
>>>>>
>>>>> anything@anythingElse is the same thing as anything[anythingElse]. Look
>>>>> up
>>>>> "Prefix" in Help.
>>>>>
>>>>> It only works when "anything" accepts a single argument, of course.
>>>>>
>>>>> And yes... both versions need f defined (unless you want results in
>>>>> terms
>>>>> of
>>>>> an unknown f).
>>>>>
>>>>> Bobby
>>>>>
>>>>> On Tue, 03 Nov 2009 01:50:44 -0600, Matthew Kooshad
>>>>> <matthewkooshad at gmail.com> wrote:
>>>>>
>>>>>> thanks a lot, David :)
>>>>>> does the 2nd example need f[x] set above it too (like f[x_] :=
>>>>>> BesselI[1,x])?
>>>>>> i tried the 2nd example without the f[x] set above it, and i replaced
>>>>>> N@f[x] with N@f'[x] , but that didn't work to show the derivative.
>>>>>> it's my first time to see this N@ syntax, so i'm not sure why it
>>>>>> didn't show the derivative. any ideas?
>>>>>> i wish for the derivative to be calculated each time i press enter in
>>>>>> the text box based on whatever function is in the inputfield.
>>>>>> thanks again,
>>>>>>
>>>>>> On Sun, Nov 1, 2009 at 6:56 AM, David Park <djmpark at comcast.net>
>>>>>> wrote:
>>>>>>>
>>>>>>> For a simple case:
>>>>>>>
>>>>>>> f[x_] := BesselI[1, x]
>>>>>>>
>>>>>>> DynamicModule[
>>>>>>>  {x = 0},
>>>>>>>  Column[{
>>>>>>>  Row[{"x: ", InputField[Dynamic[x], FieldSize -> {5, 1}]}],
>>>>>>>  Dynamic@Row[{"f[x]: ", N[f[x]]}]
>>>>>>>  }](* Column *)
>>>>>>>  ]
>>>>>>>
>>>>>>> For something like your example:
>>>>>>>
>>>>>>> DynamicModule[{x = 0, b = 0},
>>>>>>>  Deploy[Style[
>>>>>>>  Panel[Grid[
>>>>>>>  Transpose[{{Style["x", Red], Style["b", Red], "sum", "diff",
>>>>>>>     "product"}, {InputField[Dynamic[x]], InputField[Dynamic[b]],
>>>>>>>     InputField[Dynamic[N@f[x] + b], Enabled -> False],
>>>>>>>     InputField[Dynamic[N@f[x] - b], Enabled -> False],
>>>>>>>     InputField[Dynamic[N@f[x] b], Enabled -> False]}}],
>>>>>>>  Alignment -> Right](* Grid *),
>>>>>>>  ImageMargins -> 10](* Panel *),
>>>>>>>  DefaultOptions -> {InputField -> {ContinuousAction -> True,
>>>>>>>    FieldSize -> {{5, 30}, {1, Infinity}}}}
>>>>>>>  ](* Style *)
>>>>>>>  ](* Deploy *)
>>>>>>>  ]
>>>>>>>
>>>>>>>
>>>>>>> David Park
>>>>>>> djmpark at comcast.net
>>>>>>> http://home.comcast.net/~djmpark/
>>>>>>>
>>>>>>>
>>>>>>> From: matthew kooshad [mailto:matthewkooshad at gmail.com]
>>>>>>>
>>>>>>> hello, i would like to make f[x_] dynamic and based on input.
>>>>>>> i've tried changing "a = 0" for example to f[_x] = 0 and replacing
>>>>>>> all
>>>>>>> other "a" with f[x], but no luck there. will someone please guide me
>>>>>>> on this? thank you :)
>>>>>>>
>>>>>>> DynamicModule[{a = 0, b = 0},
>>>>>>>  Deploy[Style[
>>>>>>>  Panel[Grid[
>>>>>>>  Transpose[{{Style["a", Red], Style["b", Red],
>>>>>>>     "sum", "diff", "product"}, {InputField[Dynamic[a]],
>>>>>>>     InputField[Dynamic[b]],
>>>>>>>     InputField[Dynamic[a + b], Enabled -> False],
>>>>>>>     InputField[Dynamic[a - b], Enabled -> False],
>>>>>>>     InputField[Dynamic[ab], Enabled -> False]}}],
>>>>>>>  Alignment -> Right], ImageMargins -> 10],
>>>>>>>  DefaultOptions -> {InputField -> {ContinuousAction -> True,
>>>>>>>    FieldSize -> {{5, 30}, {1, Infinity}}}}]]]
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> DrMajorBob at yahoo.com
>>>>>
>>>
>>>
>>> --
>>> DrMajorBob at yahoo.com
>>>
>
>
> --
> DrMajorBob at yahoo.com
>


  • Prev by Date: Re: Characteristic Function of Pareto distribution
  • Next by Date: Re: Re: dynamicmodule with f[x_] possible?
  • Previous by thread: Re: Re: dynamicmodule with f[x_] possible?
  • Next by thread: Re: Re: dynamicmodule with f[x_] possible?