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mehdi jafari

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These are questions asked by mehdi jafari

simplify using Assume option does not wo...

mehdi jafari 749
physics assume
September 03 2016
2 5

hi every one ! i want to use Assume option to simplify some expression ! but it is not working ! what should i do !?

i have assume that ( a+b+c=0) and i want maple returns me exp(a+b+c) =1 ! but it does not ! what should i do !?


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restart:with(Physics):
> 

Assume(a+b+c=0):
> 

about(a+b+c)

a+b+c:

  is assumed to be: 0

  
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simplify(exp(a)*exp(b)*exp(c))

exp(a+b+c)

 (1)
> 

simplify(exp(a+b+c))

exp(a+b+c)

 (2)
> 

 


Download assume.mw

parametric answer for solve...

mehdi jafari 749 Maple
solve parametric
August 23 2016
3 2

i want parametrix answer for z in terms of w, what should i do ? please help

 

 

``

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restart:
> 

P:=w-10*z-1/5*z^2-1/200*z^3-1/500*z^4-z^5-1/1000*z^6

w-10*z-(1/5)*z^2-(1/200)*z^3-(1/500)*z^4-z^5-(1/1000)*z^6

 (1)
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solve(P,z)

RootOf(_Z^6+1000*_Z^5+2*_Z^4+5*_Z^3+200*_Z^2+10000*_Z-1000*w)

 (2)
> 

 

> 

 

> 

 

``

 

Download solve.mw

animation plot of two GIFs...

mehdi jafari 749 Maple
animation
August 22 2016
0 2

how can i do this GIFs with maple ?

problem with solve...

mehdi jafari 749 Maple
matrix solve
August 22 2016
2 0

i want to solve a system , A.b+B.X=0 , which A is 5*5 known matrix, B is 5*2 known matrix , and b is 5*1 and X is 2*1 unknown arbitary matrices ! i want to have solution for b and X . whatever they can be ! just equation to be solved !

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restart:
> 

A:=Matrix(5,[[-0.9800,0,0,-0.0160,0],[1.0000,0,0,0,0],[-2.1900,-9.7800,-0.0280,0.0740,0],[77.3600,-0.7700,-0.2200,-0.6700,0],[0,-79.9700,-0.0300,0.9900,0]]);

A := Matrix(5, 5, {(1, 1) = -.9800, (1, 2) = 0, (1, 3) = 0, (1, 4) = -0.160e-1, (1, 5) = 0, (2, 1) = 1.0000, (2, 2) = 0, (2, 3) = 0, (2, 4) = 0, (2, 5) = 0, (3, 1) = -2.1900, (3, 2) = -9.7800, (3, 3) = -0.280e-1, (3, 4) = 0.740e-1, (3, 5) = 0, (4, 1) = 77.3600, (4, 2) = -.7700, (4, 3) = -.2200, (4, 4) = -.6700, (4, 5) = 0, (5, 1) = 0, (5, 2) = -79.9700, (5, 3) = -0.300e-1, (5, 4) = .9900, (5, 5) = 0})

 (1)
> 

B:=Matrix((5,2),[[-2.44,0.58],[0,0],[0.18,19.62],[-6.48,0],[0,0]]);

B := Matrix(5, 2, {(1, 1) = -2.44, (1, 2) = .58, (2, 1) = 0, (2, 2) = 0, (3, 1) = .18, (3, 2) = 19.62, (4, 1) = -6.48, (4, 2) = 0, (5, 1) = 0, (5, 2) = 0})

 (2)
> 

b:=Matrix((5,1),[y[1],y[2],y[3],y[4],y[5]]);

b := Matrix(5, 1, {(1, 1) = y[1], (2, 1) = y[2], (3, 1) = y[3], (4, 1) = y[4], (5, 1) = y[5]})

 (3)
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X:=Matrix((2,1),[[x[1]],[x[2]]])

X := Matrix(2, 1, {(1, 1) = x[1], (2, 1) = x[2]})

 (4)
> 

M:=A.b+B.X

M := Matrix(5, 1, {(1, 1) = -.9800*y[1]-0.160e-1*y[4]-2.44*x[1]+.58*x[2], (2, 1) = 1.0000*y[1], (3, 1) = -2.1900*y[1]-9.7800*y[2]-0.280e-1*y[3]+0.740e-1*y[4]+.18*x[1]+19.62*x[2], (4, 1) = 77.3600*y[1]-.7700*y[2]-.2200*y[3]-.6700*y[4]-6.48*x[1], (5, 1) = -79.9700*y[2]-0.300e-1*y[3]+.9900*y[4]})

 (5)
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eval(M,y[1]=0)

Matrix([[-0.160e-1*y[4]-2.44*x[1]+.58*x[2]], [0.], [-9.7800*y[2]-0.280e-1*y[3]+0.740e-1*y[4]+.18*x[1]+19.62*x[2]], [-.7700*y[2]-.2200*y[3]-.6700*y[4]-6.48*x[1]], [-79.9700*y[2]-0.300e-1*y[3]+.9900*y[4]]])

 (6)
> 

 

> 

 

 

Download solve.mw


actually the problem to be solved is M=0 ! which directly goes to y[1]=0;
after that , how can i find other unknowns so that M=0 is ok. tnx

solve using assume option...

mehdi jafari 749 Maple
solve syntax assuming
August 17 2016
3 1

how can solve using assume option ?

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restart:
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F(z):=m*z^4-4*m*z^3+(3*m+3)*z^2-6*u;

m*z^4-4*m*z^3+(3*m+3)*z^2-6*u

 (1)
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solve(F(z),z assuming -0.5<m<0.5, 0<u<0.5)

Error, `<` unexpected

  
> 

 

 

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