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

  • To: mathgroup at smc.vnet.net
  • Subject: [mg104588] Re: [mg104511] Re: [mg104470] dynamicmodule with f[x_] possible?
  • From: DrMajorBob <btreat1 at austin.rr.com>
  • Date: Wed, 4 Nov 2009 01:38:07 -0500 (EST)
  • References: <18085121.1257066820723.JavaMail.root@n11>
  • Reply-to: drmajorbob at yahoo.com

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


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