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LeeHoYeung

Mr. Ho Yeung Lee

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12 years, 230 days

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Contact Ho Yeung Lee
Seldom to ask question after retired math hobby Welcome August, February, July, May born girl And waited for her email to mavio@protonmail.com

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These are questions asked by LeeHoYeung

How to open text file and run without ch...

LeeHoYeung 535 Maple 12
December 04 2019
1 0

I rename text file as mws when I click it , it show a few button and then need to extra click maple input and then need to click enter in order to run.

 

how to run directly when I open it with maple?

How to eval Diff(x,x)?...

LeeHoYeung 535 Maple 12
syntax diff
December 04 2019
1 7

I find eval(Diff(x,x)) still is Diff(x,x)

how to make become 1

or how to evaluate Capital Diff ?

 

and I find sum(diff(x^k,x)/k! , k=1..n)

return exp(x) *gamma(n,x)/gamma(n)

why not exp(x)?

 

and diff( m(x+ diff(...) ...) / diff without m(x) , why return 0

i still have not define m(x)

 

How to set a equation like Diff or diff ...

LeeHoYeung 535 Maple 12
December 03 2019
1 2

if there is a equation subs(...)

how to make a similar symbol like Diff(f(t),t) and diff(f(t),t) use for a new solver procedure use?

how to use permgroup ?...

LeeHoYeung 535 Maple 12
group-theory
November 23 2019
0 6

   1 1 1 2 2 3 3  

(  1 3 3 2 2 1 2 )

how to input this permutation into permgroup ?

 

Error when using FourierTransform...

LeeHoYeung 535 Maple 12
discrete-fourier-transform plotting
November 23 2019
1 1
with(DiscreteTransforms);
Digits := 600;
ss := 1:
windowlength := 50:
ma := []:
me := []:
counter1 := 1:
Z := Vector(windowlength, datatype = complex[8]);
Z5 := []:
for i from windowlength+ss to 1+ss by -1 do
eq2 := x:
eq2a := x*2:
god := solve(eq2a=y, t);
ma := [op(ma), evalf(subs(t=100, eq2a))]:
me := [op(me), 100]:
Z[counter1] := [Complex(evalf(subs(t=100, eq2a)),0)];
counter1 := counter1 + 1:
od:
Z2 := FourierTransform(Z);
Z5 := []:
for i from 1 to counter1 do
Z5 := [op(Z5),Re(Z2[i])]:
od:
p := dualaxisplot(listplot(Z, color = red), listplot(me, color = blue), style = line, gridlines = false):
p3 := dualaxisplot(listplot(ma, color = red), listplot(me, color = blue), style = line, gridlines = false):
> Z[counter1] := [Complex(evalf(subs(t = 100, eq2a)), 0)];
Error, unable to evaluate expression to hardware floats: [0.1395407376854069872222364799062994087470140319577366200576294159849633469734297167456440703192248821030980068084453175485138428545865904609881858312543669285411895851509107873579430804484462212873775830538595858575740816705029437533106045686220745333574567547827085763824574616984653193169818770743931611305635956093618789559193701301264280264321394773730076308141252308187470580964653518965117431518571850910086488220847415724949651796448259541027929735646487459091205173804995401770417274097230705447077344465381061736283732438996738107330437055827420813951050981604075837450139995544638...
> Complex(evalf(subs(t=100, eq2a));
Error, unable to match delimiters
Typesetting:-mambiguous(Complexlparevalf(subs(tequals100comma eq2a)),
  Typesetting:-merror("unable to match delimiters"))
> Complex(evalf(subs(t = 100, eq2a)), 0);
1.395407376854069872222364799062994087470140319577366200576294159849633469734\
  297167456440703192248821030980068084453175485138428545865904609881858312543\
  669285411895851509107873579430804484462212873775830538595858575740816705029\
  437533106045686220745333574567547827085763824574616984653193169818770743931\
  611305635956093618789559193701301264280264321394773730076308141252308187470\
  580964653518965117431518571850910086488220847415724949651796448259541027929\
  735646487459091205173804995401770417274097230705447077344465381061736283732\
                                                                               -571
  43899673810733043705582742081395105098160407583745013999554463814123790354 10   
   + 0. I
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