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Problem with the command solve in matrices

1 Ansicht (letzte 30 Tage)
Nuno
Nuno am 1 Mai 2013
Problem:
syms w;
D=sym('D', [4 n])
Z1=Z*D(:,1)
F3=ones(4,1)
V=solve(Z1==(1/(m*w^2-i*w*c))*F3,D(:,1))
%m and c are constants; Z is a matrix 4x4 with the variable w in it; n=constant.
My objective is getting the values of D(:,1), i.e., getting D1_1, D2_1, D3_1 and D4_1, but with that formulation I'm getting a message "Warning: Explicit solution could not be found.", and I'm not able to resolve it.
  1 Kommentar
Nuno
Nuno am 7 Mai 2013
I forgot that the Z matrix has not one, but two variables, y1 and w, for n=3 (for example).
Where, y(1,n)=sym(['y',num2str(n)]);
And Z =
[1,1,0,0]
[0,0,-1,-1]
[exp((30650000^(1/2)*((w^4)^(1/2) + w^2)^(1/2)*308151*i)/766250000)*exp((308151*(30650000*(w^4)^(1/2) - 30650000*w^2)^(1/2))/766250000), exp(-(30650000^(1/2)*((w^4)^(1/2) + w^2)^(1/2)*308151*i)/766250000)*exp(-(308151*(30650000*(w^4)^(1/2) - 30650000*w^2)^(1/2))/766250000), y1*exp((30650000^(1/2)*((w^4)^(1/2) + w^2)^(1/2)*308151*i)/766250000)*exp((308151*30650000^(1/2)*((w^4)^(1/2) - w^2)^(1/2))/766250000), y1*exp(-(30650000^(1/2)*((w^4)^(1/2) + w^2)^(1/2)*308151*i)/766250000)*exp(-(308151*30650000^(1/2)*((w^4)^(1/2) - w^2)^(1/2))/766250000)]
[y1*exp((30650000^(1/2)*((w^4)^(1/2) + w^2)^(1/2)*308151*i)/766250000)*exp((308151*30650000^(1/2)*((w^4)^(1/2) - w^2)^(1/2))/766250000), y1*exp(-(30650000^(1/2)*((w^4)^(1/2) + w^2)^(1/2)*308151*i)/766250000)*exp(-(308151*30650000^(1/2)*((w^4)^(1/2) - w^2)^(1/2))/766250000), -exp((30650000^(1/2)*((w^4)^(1/2) + w^2)^(1/2)*308151*i)/766250000)*exp((308151*30650000^(1/2)*((w^4)^(1/2) - w^2)^(1/2))/766250000), -exp(-(30650000^(1/2)*((w^4)^(1/2) + w^2)^(1/2)*308151*i)/766250000)*exp(-(308151*30650000^(1/2)*((w^4)^(1/2) - w^2)^(1/2))/766250000)]
Sorry for my mistake.

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