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 >