aryan_ams

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12 years, 119 days

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These are questions asked by aryan_ams

hi,

how to change coordinate system? 

for example :

diff(f(x, y), x)   =   (diff(f(r, theta), r))*cos(theta)-(diff(f(r, theta), theta))*sin(theta)/r

 

thx;

aryan.

 

I don't know why maple can't solve this PDE

> restart;

> PDE := 4.2000*10^6*(diff(u[1](x, t), t))-.445*(diff(u[1](x, t), x, x))+4200.*u[1](x, t)+464.82-20836.*x-15.832*t+4.0442*10^5*x^2+2953.7*x*t+0.14631e-1*t^2+9.6788*10^6*x^3-2.7139*10^5*x^2*t-.99786*x*t^2+0.15902e-4*t^3-1.0085*10^9*x^4-6.3082*10^6*x^3*t-1069.3*x^2*t^2-0.15006e-1*x*t^3-3.9073*10^(-8)*t^4+2.3478*10^10*x^5+2.5874*10^8*x^4*t+1.2265*10^5*x^3*t^2+2.9028*x^2*t^3+0.17521e-4*x*t^4+1.9407*10^(-11...

how can i solve matrix ?

for example :

Matrix(4, 4, {(1, 1) = 18, (1, 2) = -45, (1, 3) = 36, (1, 4) = -9, (2, 1) = 9, (2, 2) = -18, (2, 3) = 9, (2, 4) = 0, (3, 1) = 0, (3, 2) = 9, (3, 3) = -18, (3, 4) = 9, (4, 1) = -9, (4, 2) = 36, (4, 3) = -45, (4, 4) = 18})  

m(x[i]) = product(x[i]-x[j], j = 1 .. N)              i <> j

ex:

for N=4

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