djc

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15 years, 359 days
Technical professional in industry or government
Budapest, Hungary

MaplePrimes Activity


These are questions asked by djc


 

Hello,

I have problem with Inverse Fourier Transformation. I have an expression S, Maple can't calculate its Inverse Fourier Transform:
 

restart;with(inttrans);

S:=Heaviside(-w)*exp(-(9/640000000*I)*w)/w^2;
invfourier(S,w,t);

 

I have Maple 13.
Thanks for help in advance.


Hello,

I am working on the system model of an impulse radar.  My primer aim is to simulate the received signal. I use signal components and some simple elctrical circuits in the Maplesim model. First version of the system works fine, but I'd like to develop it.

I have the following problems:

- I don't find a way to put a time-delay in the system (in time-domain or in s-domain in the form of' *exp(-s*T)' )

- It seems to me that there is no direct way to add noise to the system (like Gaussian...)

Hello,

I am new to Maplesim and I would like to multiply 2 voltage-time functions ( mixing in time-domain), but I have no succes with the (Mathematical-Operators-) Product component ( I can't connect it to the voltage sources). How can be done this? Thanks for your help in advance.

 


Hello,

Happy New Year!

My problem:

I don't know why algsubs fails in the following case:

restart;
Xw:=2*Pi^2*(sin(w)*cos(5*w)+sin(4*w))/(w*(Pi-2*w)*(2*w+Pi));
algsubs(w=2*Pi*f,Xw);# problem in the denominator. w is not substituted.
subs(w=2*Pi*f,Xw);# subs works correctly
 

(I have Maple 13)

Hello,

I would like to use the ResponsePlot function from the DynamicalSystems package, but it doesn't work for me (it gives an error message see below):

restart;with(DynamicSystems);
tr:=1/(1+1.000000000*s/Pi);
sys1 := NewSystem(TransferFunction(tr));
PrintSystem(sys1);
MagnitudePlot(sys1);
vin := Sine(1, 2);
Tsim := 10;
ResponsePlot(sys1,vin,duration=Tsim,color=[red, blue],thickness=2);
 

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